Revotec fan mounting?

[adriantr4]

Hi

I am considering fitting a Revotec fan to my '4, leaving the fan extension in place.

Although I believe puller fans to be preferable, I thought I might attempt a home-brew pusher version, and just rig a simple on/off switch & maybe an indicator lamp.

I can buy the fan itself cheaply, but the top-end kit comes with metal mountings for the fan. As a cheapskate, could I make these, or similar, myself? Or ...?

 

Thanks, Adrian

[RobH]

Of course you can make them yourself.

I made my own pusher fan-mountings on a 3A using those universal perforated steel strips available from most car bits shops, because I didn't like the plastic rods supplied with the fan, which are supposed to be pushed through the radiator core.  The strips fix at the top using the radiator mounting points and at the bottom are bolted through the base of the front cowling.  

If you are going to do a puller installation you could probably connect on the lower rad mountings too.

 

 

Edited Tuesday at 09:48 PM by RobH

[Kiwifrog]

I got my electric fan from these guys, cheaper than the usual suspects, don’t forget the relay.

https://www.carbuilder.com/pages/search-results-page?q=electric fan

Edited Wednesday at 05:57 AM by Kiwifrog

[RogerH]

Hi Adrian

yes, you can do it yourself - and often more reliable.

Not all frans are equal have a look here  Spal 13.8"    Have a look at the airflow rate  CFM   cheaper is less than more expensive - nearly double.

The surround of the radiator on the TR4A is steel - so I simply welded brackets where needed.

Why do you want to keep the crank extension if it does not serve a purpose.

 

Roger

[Ian Vincent]

1 hour ago, RogerH said:

The surround of the radiator on the TR4A is steel - so I simply welded brackets where needed

Ditto on my TR3a.

Rgds Ian

[adriantr4]

Thanks to all. Understood.

I thought I might keep the crank extension (fan extension) to mitigate against the 4-pot crankshaft cracking (?).

Adrian 

[RogerH]

10 minutes ago, adriantr4 said:

Thanks to all. Understood.

I thought I might keep the crank extension (fan extension) to mitigate against the 4-pot crankshaft cracking (?).

Adrian 

Hi Adrian,

that is possibly the most magnificent myth within the TR community.  If you study the crack face you can see how these cranks break.
The good thing is that they only ever break once.
Removing the extension does no harm and does allow easy fitment of the fan belt.

Roger

[Charlie D]

On my 3A I made my own pusher system using a second hand fan from Ebay (I believe it was from some Ford  2.5 diesel and cost about £15 or so.)
I bolted two bits of  1 1/2" square section  wood to each of the radiator side supports ( to space the fan away from the rad.) and put a couple of cross pieces of flat  1/8" x 1" between them. I screwed the fan surround to these cross pieces. Used a thermo switch in the rad hose plus a manual switch (through a relay) on the dash.

Nearly 6000 miles with no problems.

EDIT:

It was actually from a  Rover "Fan Cowl & Motor Assembly RH - PGF100760 - MG Rover"

I discarded the cowling and attached it using the three motor fixings.

Edited Thursday at 02:16 PM by Charlie D

[Malbaby]

Have you considered a narrow fan belt conversion with a harmonic crankshaft balancer.

[tim hunt]

On 5/6/2026 at 8:26 PM, RogerH said:

Hi Adrian,

that is possibly the most magnificent myth within the TR community.  If you study the crack face you can see how these cranks break.
The good thing is that they only ever break once.
Removing the extension does no harm and does allow easy fitment of the fan belt.

Roger

I fitted a (second hand) Kenlowe pusher fan over 40 years ago. Along with the mechanical fan assembly I also junked the conical fan extension. I was motivated by my desire to be able to change the original thick type fan belt without having to loosen the mountings and jack the engine up a little to give sufficient clearance between the extension and rack tube. At the time armchair critics told me that I risked a broken crank since I had dispensed with an important balancing element. I hope I am not tempting Providence in mentioning that I have since done 170K+ miles on the original crank, which is still going strong. 

Tim

[RogerH]

Nothing like a good myth to keep the wheels of a forum going.  

Roger