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Welcome to this growing compilation of pamphlets, TR Owners' Manuals, articles, posters, competition tuning books and technical articles. NB. Individual links can be downloaded. Contents list coming soon! Most of this material is out of print. It is well-known to many who use the TR Register Forum. But if you are a new owner, or considering purchasing a TR, you will find many valuable resources that provide essential background knowledge or technical, hands-on advice for restoration or maintenance. True, books can be found online, second hand, but this library enables you to gain immediate access for consultation. If you know of useful material, including links to youtube TR teach-ins, please add your links in the response section below and I shall add them to the list. The ambition is to gather all scattered materials in a one-stop, expanding library resource, free of charge and available to all. 1. TerriAnn's Triumph TR website. Go to: http://www.tr3a.info/index.htm This site contains valuable articles by TerriAnn, an American TR3A owner who bought her TR in 1986 and restored it herself. She launched her site in 1998. (The most recent addition is dated 2020). It is organized into: 1. Articles 2. Data mine 3. Links. Very accessible, providing practical advice to help new owners understand the peculiarities of Triumph TRs, how to service and repair them, or tune them. As well as an account of her own restoration, the site provides a wealth of resources, including, for example, TR2-4A cylinder head information and specs, how to convert a positive earth car to negative earth, practical guide to Weber carburettors for TRs, common rust areas, a collection of articles by different TR experts, including the famous Kas Kastner, on a range of recurring issues and problems. Also, TR Register of America "Judging Standards and Restoration Guide" (2004 revised edn.). Helpful as a buyer's guide, if originality is considered important, or a bargaining lever, when a car for sale has the wrong grille or back end, for example. TerriAnn also provides access to original Triumph period Service Bulletins, scanned as PDFs (1954-1965). From 1954, Standard-Triumph issued bulletins as "Service Information Sheets". Credits: Joe Curry's print copies were scanned into PDF format by Michael Porter. First posted online by Dan Buettner, then collected and included in TerriAnn's website. 2. A US 1954 review of the TR2 This includes both the full, readable, text and reproductions of the original illustrated article. The author, Tom McCahill, was highly respected by Alec Pringle who corresponded with him many years ago. Tom McCahill, "MI Tests the Triumph TR2", Mechanix Illustrated, August 1954. http://blog.modernmechanix.com/tag/auto-reviews/ 2a. Richard Heseltine, "1959-1961 Triumph Italia 2000", Drives Today, 8 February 2021. https://drives.today/articles/155/retro/1959-1961-triumph-italia-2000/richard-heseltine.html 3. Continental tyres manual https://blobs.continental-tires.com/www8/servlet/blob/85806/30cec2cae7fa004e1eae3b0f560e449f/download-technical-databook-data.pdf 4. On South African CKD sidescreen cars: http://motor-assemblies.blogspot.com/?m=0 5. Screen assembly, by Stuart Edwards https://www.tr-register.co.uk/forums/applications/core/interface/file/attachment.php?id=40017 6. Advice on fitting rag top (hood) and windshield http://tr3a.info/sticks.htm 7. Tuning H series SUs from Burlen website https://sucarb.co.uk/technical-h-type-carburetter-tuning-multi 8. Paint charts, courtesy of VTR http://www.vintagetriumphregister.org/maintain/paint-charts/index.shtml 9. Velocity stacks (ram pipes) 9a Explanation https://mgaguru.com/mgtech/power/pp104.htm 9b Production Drawing https://mgaguru.com/mgtech/power/pp104a.htm 9c Rolling road Test https://mgaguru.com/mgtech/power/pp104b.htm 10. Antifreeze and advice not to buy OATs Richard Meyer's advice on which antifreeze to pick: https://mgaguru.com/mgtech/cooling/cool_121.htm 11. A-Type Laycock-De Normanville Overdrive: https://www.tr-register.co.uk/forums/applications/core/interface/file/attachment.php?id=42516 12. R. D. Franck, Weber tuning https://www.tr-register.co.uk/forums/applications/core/interface/file/attachment.php?id=42609 13. Some duplication, but worth scrolling through for whatever you need: https://drive.google.com/drive/folders/0B2H2NJt34OffMDVmOTZlZWItYTcyMy00ZDhkLTliOWEtOWU1OWRhNDZhYmRl 14. J.B. Calvert, "How a CV Joint Works", 25 January 2007. Source:http://mysite.du.edu/~etuttle/tech/cv.htm 15. Windtone horns, courtesy of Ian Vincent Source: https://www.tr-register.co.uk/forums/applications/core/interface/file/attachment.php?id=44949 16. SU Carb Guru Dave DuBois. The following links take you to the technical writings of the world famous expert. DuBois was a gifted technician who used his experience to bring simple fixes to some of the perplexing problems of our cars, mostly related to electrical contacts, fuel pumps and safety. Until 2019, his writings were available online. For almost 50 years he graced enthusiasts with solid advice, good humour and perfectly working fuel pumps. He is sorely missed, but his son, Dave DuBois, has granted permission to publish his writings online The links will open in a new window. http://www.dbraun99.com/Dave DuBois/ 17. 1950s Overseas Lucas Technical Correspondence Course Ideal for early TR2 owners: 1950s Overseas Lucas Technical Correspondence Course. Go to: http://www.dbraun99.com/Technical Index/Lucas technical correspondence course SEARCHABLE binder.pdf 18. How to identify what distributor is fitted to your TR Clear demonstration. Includes short youtube footage. https://blog.simonbbc.com/about-distributors/identify-my-distributor/ 19. Chart from www.starchak.ca listing Lucas distributor models. http://www.starchak.ca/tech/pdfs/lucas.pdf (NB. The distributor type number is stamped into the side of the body, immediately below the top of the metal rim on the side facing away from the engine.). 20. Craig Landum, "Repair Instructions for TR2-3A turning signal mechanism on steering wheel control head" Instructions for removing the steering wheel control head Peter Wigglesworth: "Not hard to get the horn push out. Three screws at the steering wheel boss. Disconnect the 4 wires near the horn that connect to the loom. Pull the horn push toward you as someone helps feed the wires up the stator tube. You can get the horn push control in your lap to fiddle with, without pulling the wires up the stator tube." Craig Landum, For repair Instructions for TR2-3A turning signal mechanism on steering wheel control head, go to: Craig Lundrum, 2009 http://xjguy.com/triumph/tr3a_turn_signal_mechanism.pdf See also: Clive Elsdon, http://www.ovtc.net/uploads/9/5/1/6/9516577/tr3_control_head-disassemble_-_clive_elsdon.pdf 21. TR 3A Step-by-Step Carpet Installation https://triumphtr3b.wordpress.com/2020/05/08/installing-moss-carpet-kit-in-a-triumph-tr3a/ 22. Larry and Tom Young, "Triumph Cams", Tilden Technologies, LLC (online), 2011 [About TR2-4 camshafts, including comparative technical table, based on manufacturers' data.]. (Courtesy of Ian Vincent who provided the link). http://tildentechnologies.com/Cams/TriumphCams.html 23. Buckeye Triumphs, "A-type and J-type Laycock De Normanville Overdrive" Technical article available online, courtesy of a member of Buckeye Triumphs, Delaware, USA The Buckeye Triumphs site contains technical articles on brakes, body and miscellaneous, carburettors, clutch, gearbox, A- and J-type overdrives, mechanical, steering, and suspension (and their Newsletters 1999-2011). https://www.buckeyetriumphs.org/gearbox 24. Gulf Lubrication Chart TR2-4A (just click on image below). 25. TR 4-4A Lube Chart Courtesy of Ian Cornish. The chart is fairly legible when you enlarge the image. I you seek a perfect copy, do contact the TR Register Office who sell them at a very reasonable price. 26. Weber DCOE Theory, Operation, and Tuning (with links to youtube demos and several other sites) Illustrated guide: http://240260280.com/Tech/Carbs/Weber/DCOE Theory Operation and Tuning.html 27. Dave Andrews, "Selection and Tuning of Weber DCOE" http://www.s262612653.websitehome.co.uk/DVAndrews/webers [NB. Dave Andrews set up and runs DVA Power, a small company situated in Milton Keynes specializing in engine tuning and building.] 28. How to fit TR2-3-3A-3B Bonnet Dzus Fastener Assembly. Moss pdf https://mossmotors.com/media/instructions/802-918_980-178_INST.pdf 29. Mostly TR4-4A Manuals, technical articles, and entire books on tuning TR engines by Kastner, Vizard, and Williams. http://tr4a.weebly.com/triumph-tr-pdf-downloads.html [Credit: Thanks to Paul Anderson who sent the link to this material, originally compiled by Randall Young, a long-term owner of TR3As and Triumph Stags in Southern California.] 30. A Guide to Tuning Weber Carburettors, Borg-Warner, 1976 2nd edn. [PDF] Includes suggested settings for Triumph TR2-3A and Triumph 2000. Clear explanations. Helpful. https://linksharing.samsungcloud.com/knmYWkaKt7FU 31. Des Hammill, How to Build and Power Tune Weber and Dell'Orto DCOE, DCO/SP, and DHLA Carburettors, Dorchester: Veloce Publishing, 3rd edn. 2018 Practical, user friendly guide, explaining the workings, but concentrating on how to go about configuring your carburettors, by explaining what chokes, jets, emulsion tubes and so on are available and how to choose the right ones for your Webers or Dell'Ortos, depending on use and engine configuration. Well-illustrated, lots of explanatory diagrams. https://linksharing.samsungcloud.com/9csmWa2V09RJ 32. Understanding the Weber Carburettor (Part 1) This is understandable and even useful, but only after reading some of the texts above. It complements them well, but I think it would only be confusing to watch this first. 33. Bellows-type thermostats (TR2-4) This explanation of how bellows thermostats function deals with thermostats fitted to early XK Jaguars. But it is helpful to understand how they work, including on Triumph TRs. Thanks to Phil Brown for signposting this fact sheet within the Forum. http://www.bobine.nl/jaguar/02-engine/thermostats-for-jaguar-xk-120-140-and-150/ 34. Which “Viton” is the one to order? The following document explains the technicalities surrounding these seals and why you must specify “Viton Grade B” for O-rings and oil seals and get confirmation from your supplier that this is one in stock. [Credit: Thanks to Waldi for posting]. eriks - viton fluoroelastomers an overview (1).pdf 35. Velocity stacks [pls add any other info you have] https://mgaguru.com/mgtech/power/pp104.htm 36. Description of SAH (Sid. A. Hurrell) tuning catalogue TR2-4 https://www.oldclassiccar.co.uk/sah-triumphtune.htm 37. Alternator fitment and conversion, pages from The Unipart Rotating Electrics, go to: https://www.tr-register.co.uk/forums/applications/core/interface/file/attachment.php?id=59372 38. How to fit TR2-3-3A-3B Bonnet Dzus Fastener Assembly [Moss pdf]. Go to: https://mossmotors.com/media/instructions/802-918_980-178_INST.pdf 39. Training Video on TR6 TR7 TR8 Lucas wiper motor. Refers to Jaguar and MG, but the basic motor is the same. https://www.youtube.com/watch?v=-aSaBMPp8ZM 40. "A" Type Overdrive Instructions https://www.tr-register.co.uk/forums/applications/core/interface/file/attachment.php?id=60187 41. The Standard-Triumph Hardware Catalogue. 7Useful accompaniment to the TR2-3A Spare Parts Catalogue (4th edition). Invaluable resource, since it cross-references all the fastener details used by Standard Triumph. http://tr4a.weebly.com/uploads/2/1/9/8/21980360/standard_triumph_hardware_catalog.pdf 42. TR6 Repair Manual (second edn.) "Brown Bible", in pdf format https://britishcarbreakfastclubcom.files.wordpress.com/2015/11/tr6_repair_manual.pdf 43. "H" type SU carburettors https://mgaguru.com/mgtech/carbs/carb.htm 44. SU Carburettors (all types), Technical articles by Burlen Ltd. https://sucarb.co.uk/technical-h-type-carburetter-reassembly
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Morning all. My ongoing journey of discovery with Percy has today led me to the boot - the fuel pump to be specific. Its all working fine (touch wood) but it struck me I don't know as much about it as I probably should. Its a Bosch type pump and I have attached a photo showing what I believe each part to be - confirmation of my labelling would be a good start. More importantly, perhaps, I am looking for some advice on the filter or filters. How often should these be cleaned and / or replaced? I believe the pump has only been in there for less than 2 years but I've done nothing to it since acquiring the car. The glass filter (if that's what it is) appears to have a bit of debris inside so I think it may benefit from a clean. Additional questions along the same lines are: can the filters be cleaned or must they be replaced? if cleaned - then how? if replaced - from where? Apologies once again for the basic questions - I've tried finding out elsewhere on the web and via other fuel pump related posts but am no further forward. Steve.
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Went to visit a 175 year old Rail engineering works in Dublin today with the Triumph Classic Owners Club, the excellent TR Register affiliate in Ireland. Really interesting place, a little bit reduced from what it used to be back in the day in that nowadays these types of works don’t cast their own own wheels etc so there isn’t a forge in site but all other aspects of rail engineering takes place. Very few plants that one will visit nowadays with a 175 year history on the same site, thought the group might enjoy some of the photos, big Triumph turnout too and the rail engineers gave them a good examination! Great day out.
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My fan belt has a loose fit. If I press down on the top part the fan belt it moves 1 1/2" or possibly a little more.It is a bit awkward to get the tape in place accurately . I am hoping that this will avoid wear to the dynamo. But I am asking if this would affect the output and maybe the ammeter reading ? The ignition light goes off on starting and will show if the revs drop to low tick over. Any advice Richard & B
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Gents Good evening The cold months are with us and the time for some routine maintenance (otherwise known as quality time) has arrived My question is this; Given that my car has modern bottom end shells, modern, little end bearings, 2002 camshaft, pistons and rings & replacement oil pump amongst other things (in fact, rebuilds and replacement parts mean that the head and block are probably the only original or pre 1998 components left of the 1975 engine that rolled out of the factory), which engine oil should I use? Do I stick with the specialist Castrol / Penrite / Miller classic oils? Given that the engine parts are all of modern manufacture, can I utilise a modern multigrade mineral or synthetic oil? Thanks in advance John
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I am now checking my rear axle. There are some creaks and groans. If I make a small mark on the rim of the rear wheel at 12.00 , how far should I be able to rotate the wheel before the shaft is connected firmly with the differential ? Where will my small mark be moved to when the whole axle is in good condition ? Please let me know ?? Richard & B
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Hi All... following a nice day out in the car last week, I stopped for a coffee and when I came back out it wouldn’t start. The key was simply turning in the ignition switch! Looking at the back of the switch I could see that the brown wire had melted the insulation at the spade connector. This must have been an issue for a while as the innards of the switch had perished too! New switch ordered but 2 questions: 1) What would cause this to overheat? A bad connection I assume but is it safe to assume that was down to a failing switch or problem elsewhere? 2) In replacing the spade connector on the brown wire, what should it be rated at? I’m assuming 30A - though I am not sure I know why I think that. Cheers, Steve
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Hi All.... been a while since I was on here but need some advice on what I am sure is an easy question (if you know the answer!) My passenger side headlight went really dim a couple of days ago. I assumed the bulb was on its way out so replaced it - but the replacement(s) are just as dim. Given that, my next assumption is that it must be a loose/poor connection somewhere. Does that sound reasonable? If not, can anyone shed any light on the subject?
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As the title says i had a problem fitting the four seasons heater valve, the old one came out with no issue, I fitted the new one with some thread sealant even the rubber pipe went back on just fine, But I wasn't sure how tight to do it up, and so as the thread sealant says you can reposition up to four hours I thought I'll tighten it some more to be sure, that's when I noticed the valve would no longer turn with the lever! I took it off again and I can't see where I've bent or pinched the housing, but it didn't take a lot for the top part to start spinning instead of the valve inside, so it's had it. If i get another one, how do I put it back on? How tight is enough? Would the thread sealant (permatex) have held if had I just left it the 72 hours of curing time the first time? Cheers Gareth
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This should keep you busy Please add on 1/ New type Kenlowe fan
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Help! ive removed the front offside ball joint as the gaiter was perished and the joint itself wasn’t in great nick Attempting to install the replacement which I thought should be easy enough but I can’t tighten the nyloc which holds the ball joint to the vertical link - the joint itself turns as well as the nut! I had assumed the fitting was tapered and would self grip - an I doing something wrong or could I have been sent the wrong part? I bought it from ANG classic car parts and it claims to be for a TR6 - part number GSJ131 (same as Rimmers) Any suggestions gratefully received. Steve
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This question is popular on other forums and I couldnt find anything on here so I thought I'd start..........better if you can show pictures. Today Ive fitted a firewall to my TR4. Not that bad to fit but not sure what level of seal is acceptable/advised.
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Hi All Car lifts. Just wondering what solutions everyone had come up with? Now its not just a TR thing as i do have a couple of other oldish steeds on the fleet that i need to look after, but i'm considering something i can use on the TR as i've still got some plumbing to do underneath, but i've also go the Wife's (cough cough) MG TF to look after and at 15 years old it needs a fair bit of fettling, with suspension and rust problems to sort, subframe and suspension rust as the body is almost immaculate, they were pretty good at the end. But only having a domestic garage and narrow drive space is very limited, but TBH i'm a little fed up with trolly jacks, which don't fit under the MG anyway, and axle stands, its all abit of a pain and timeconsuming getting them in the air. So i've been looking round for some kind of lift. Clearly no room for a post lift or the like, although i've seen some sizzor things and alot seen to be pretty serious bits of kit with prices to match although i've found a couple of cheapo ones but also most seem to have cross beams so not easy to access under neath. Now has to be "portable" or at least put awayable as i cannot just leave it on my drive, so nothing fixed or big and heavy. One i've seen is this but it looks a little low and unsure if its sturdy enough https://www.quickjacklift.co.uk/car-lift-systems/bl-3500slx-portable-car-lift.html So any other ideas or recommendations out there. Cheers Keith
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Hi All I know this one has been discussed before but this is more of a technical question rather than an opinion. So my 1972 TR6 is off the road at present undergoing a long term restoration. As its now MOT exempt do I need to MOT it when finished or do I just remove the sorn declare it MOT exempt and tax it? If the latter is ok how long does that process take and can I commence it prior to it being finished or is it still illegal to go through that process with a car which could not pass an MOT despite it sitting in my garage and there being no intention of it being on the road until complete. Ill probably get it checked over by a specialist before driving it regularly anyway but just want to cover all eventualities. cheers Keith
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After lavishing money, time and effort on my 1972 TR6 this year in a number of areas. Famously eliminating my age old fuel smell problem and more significantly cash spent on my 132k miles engine to breathe new life into it. As well the gear box being extracted for primarily a noisy first gear, the lay shaft bearing had landed up in the overdrive with no additional damage thank goodness. All back together with a new clutch to suit. Whilst fettling with the cars induction over the past week or so to get things just right, I noticed the clutch master cylinder had dropped to almost empty, however on filling it up I noted I hadn't lost prime and clutch activation. (The garage hadn't needed to disturb the clutch hydraulics.) The symptoms were loss of fluid from the slave cylinder under the car, the colour of the fluid on the floor was a dirty black colour. Also the bottom of the master cylinder was full of black 'mush'. which I removed as best I could. I fitted a new slave cylinder yesterday and relocated the linkage to the top hole on the activation lever. With the help of my son I have bled the system numerous times (Dot 4) through a rubber tube into a flooded jar, with no evidence of air bubbling through, and although the pedal feels fine I cannot engage gear. On starting the car in gear with the clutch disengaged there is slight clutch drag, but the car cant be driven. I haven't measured the throw of the slave assembly pin, but it looks like about 15 mm. There is no evidence of leakage from the master cylinder, however removing the rubber gaiter, the piston is fouled with black residue. I'm beginning to think the master cylinder given the evidence above is now problematic. I'd love to hear the readers views on this experience. Best Regards Trevor Hughes
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Hi guys, Thanks for all the helpful posts I've already learnt from. As a relatively new 6 owner here, and I want to check my thrust washers as a preventative measure. I've searched through many threads on here and have got a good idea now, but I wanted to list it out to make sure I've got it right. 1) using a Dti gauge measure the current end float (push pulley in, press clutch to push out) 2) if above reveals wear over minimum, drain oil, remove sump, bearing cap and take out TW's and check (if possible) what size were fitted. 3) if I can see what size were fitted then order a new set of the same and fit and re test the end float. Any variation would now need an additional over size TW to that was previously fitted? Is it obvious which way round they fit? 4) use assembly lube to refit TW's and bearing/cap, torque up. 5) new sump gasket (and a sealant?) And fit sump, new oil, check for leaks. Is that pretty much the method? Gareth
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Hi everyone. Just discovered that there doesn't appear to be info in the TR4 Workshop Manual on how to adjust the accelerator pedal screw. It is referred to in the Manual - P1.306, Fig 11, Items 23 & 24. However, nothing as to the correct setting. The excess thread sticks out rather a long way from the scuttle panel. See pics attached. Does anyone have a starter figure? Best wishes Willie.
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Hi All, I am hoping someone will pick this request up and confirm a point of confusion before my TR4 gets the gearbox overhaul completed. WHICH WAY ROUND DOES THE CLUTCH RELEASE BEARING GO? Does the larger diameter flat face point outwards from the bellhousing as the original TR4 Workshop Manual illustrates? That is how the bearing is set currently, but in the next couple of hours we will either commit to that or have to open the assembly up and swap it round. I hope this reaches an authority on the subject in time!! Best wishes Willie
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I've often been asked about drain keys or spanners, many folks don't even know what one looks like . . . . . after all, they're not something you get in the average socket set, and very much a thing of the past. Nevertheless, a damn useful bit of kit when you need one. Here's an example of one on the 'bay . . . . nowt to do with me, I'm just trying to be helpful ! http://www.ebay.co.uk/itm/VINTAGE-MELCO-DPW-3-SUMP-GEARBOX-AXLE-DRAIN-PLUG-KEY-SPANNER-/142539416782?epid=2038095214&hash=item213002e4ce:g:2UQAAOSwx6pYoGAT Cheers Alec
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So I have a temporary garage at the moment its very tight spaced so I bought one of those easy tanks that are only 8cm high for collecting oil from sump so I could work from the front of the car with only the need to raise my Tr5 a couple of inches. Like a wally I didnt think to remove the second plug to on it to speed air out and so the rush of oil overdid the flow into the collector. Now I have about a litre of nice black oil on the concrete floor of the garage.... I have googled ways to clean ranging from WD40 to Coca Cola. Anyone got some magic solution for removing the foot square stain??? Well at least as always my magnetic drain plug was perfectly clean of any swarf. Cant same for garage floor now though ....
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Why is it so difficult to fit the heater? I had the motor overhauled and cleaned up the rest of it. Trying to make it fit back in is very hard. The bracket which attaches to the bulkhead behind the battery seem to hold the heater too low. I removed the dashboard stay and fitted the heater back in but it needed a lot of leverage to replace the stay. After a while lying on your back under the dashboard, begins to lose it's appeal. This is not a complicated job but I am obviously doing it the wrong way. Any advice would be very useful Almost ready for Drive it Day. Thanks Richard
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Bought a couple of new trunnions today just to sling in my parts bin. However Mr Moss does 2 types, a 'proper' one and a 'replacement' obviously there is a price difference and me being me went for the more expensive option! So the questions are: What IS the difference between the two? (how would one know that a 'cheap' one hadn't been put into a bag marked with the more expensive option!) Hypothetical question!! I note that the bottom has a steel base, is that correct? ROGERRRRRR one for you! Dave
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Does anybody have experience with this company please. http://www.jlspares.com/
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Hello, having a good clearout of stuff I no longer need or in this case, have never used, brand new King Dick sockets and extensions for use with an impact driver, all imperial British Made, excellent Quality, Brand New 3/8" drive sockets, 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4" all six point in black industrial finish 3/8" drive deep sockets 7/16", 1/2", 9/16" 2 Extensions 1 1/2" and 3" He named the tool firm after his dog if you were wondering, £40 including postage, grab a bargain!! Cheers, Andrew Now Sold
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Hello everyone, I would really appreciate some points of view on this topic. I rebuilt my '71 TR6 using original parts in 1989. It has not done a whole lot of miles since and stood for extended periods while we lived overseas. I have now passed the car on to my son and am giving him some assistance in swapping in a replacement gearbox. As a matter of course we are replacing the clutch (well having the Laycock unit re-manufactured by Precision Clutch), release bearing etc. plus any other pieces that make sense 'while I am there'. I have two questions: 1) The original gearbox mount fitted in '89 is in good order but is getting on in years. Should I replace this with a new reproduction item or stick with a sound original? There is no sign of perishing or undue movement. 2) Should I change the rear oil seal simply based on its 29 years of limited service. There is no sign of any leak (posted on old thread yesterday but no response). Just trying to resolve 'if it aint broke don't fix it' vs best practices vs relative quality of new reproduction parts. Many thanks, John