Tappets or something else

[Ralph Whitaker]

 I can see I should have scrubbed out that scribble on the back of the package I pictured as it is going to lead to confusion. Take no notice of that, it is wrong anyway, by my new calculation each click of the adjuster lengthens or shortens the adjusting screw by 1.38 thousandths of an inch, so 10 thou on the adjusting screw is actually 7.25 clicks of the tool. But this is not adjustment at the valve end as has been pointed out, that depends on the rocker ratio. You must determine the amount of clicks necessary by the procedure outlined in my previous post.

Ralph

[Ian Vincent]

On 6/5/2026 at 9:21 PM, Z320 said:

My calculation is,

- 8 clicks (AI: 30 for a hole turn), are too much, this will be a 0.45 mm gap!

How od I calculate?

8/30 of the 24 tpi of the adjusting scwew x the ratio of the rocker levers, about 40/25 mm (valve side/adjuster side)

- 60°  is much better, this should be a 0.283 mm gap

- 53° will be a 0.25 mm gap

- all ON A TR 4 CYLINDER, others different

Can anybody check and confirm, please

I have a Clikadjust and for my pretty standard TR3a, 7 clicks = 14 thou for the inlets and 8 clicks = 16 thou for the exhausts.  Those are the recommended clearances for my Newman PH1 camshaft.

Rgds Ian

[Z320]

My calculation is based on AI telling me 30 clicks are one full turn,

it would be great somebody could confirm, please.

[Ian Vincent]

1 hour ago, Z320 said:

My calculation is based on AI telling me 30 clicks are one full turn,

it would be great somebody could confirm, please.

I can confirm that 30 clicks is one full turn.

Rgds Ian

[Ralph Whitaker]

13 hours ago, Ian Vincent said:

I have a Clikadjust and for my pretty standard TR3a, 7 clicks = 14 thou for the inlets and 8 clicks = 16 thou for the exhausts.  Those are the recommended clearances for my Newman PH1 camshaft.

Rgds Ian

I take it you have the standard rockers, I was checking mine again yesterday and arrived at 5 clicks to give me 10thou, so if yours are standard it would seem that each click is 2thou.

Ralph

[Ian Vincent]

On 6/9/2026 at 8:12 AM, Ralph Whitaker said:

I take it you have the standard rockers, I was checking mine again yesterday and arrived at 5 clicks to give me 10thou, so if yours are standard it would seem that each click is 2thou.

Ralph

Hi Ralph, yes I have standard rockers that are nominally 1:1.5 but that takes no account of variables of exactly where the rocker bears on the top of the valve stem.

Anyway assuming that the thread on the adjuster is still standard 1/24”, 8 clicks equate to 0.01667”.

Rgds Ian

Edited June 10 by Ian Vincent

[Z320]

On 6/8/2026 at 7:16 PM, Ian Vincent said:

I have a Clikadjust and for my pretty standard TR3a,

7 clicks = 14 thou for the inlets and 8 clicks = 16 thou for the exhausts.  

Those are the recommended clearances for my Newman PH1 camshaft.

Rgds Ian

My check is a ratio of 1.4

1“/24/30x7x ratio 1.4=0.0136“

1“/24/30x8x ratio 1.4=0.0156“

Edited June 9 by Z320