Valve Clearances

[anonymous-user]

Just checking all the clearances now after a full rebuild( engine not run) and some are on the lower end for clearance and some mid point. None at the upper end.
Whilst its all out and I have new shims would you start at lower end( smallest gap) mid or largest.
When the engine runs in do they close or open in gap with wear.


Also just checking I measure between shim and the foot of the new folowwer yes? NOT between cam and top of follower?

Thank you


David

Edited by anonymous-user on Sunday 20th November 10:48

[HarryW]

cliffords said:

Just checking all the clearances now after a full rebuild( engine not run) and some are on the lower end for clearance and some mid point. None at the upper end.

Whilst its all out and I have new shims would you start at lower end( smallest gap) mid or largest.
When the engine runs in do they close or open in gap with wear.

Thank you


David

I assume it's the same as the AJP8, in which case the gap closes up with use and age (valve stems stretch?). Which is why a quiet lump without clatter on a cold start up is not what you want...

[tofts]

With a rebuild and assuming new grade cam and followers, they will probably wear tight.

And yes, between the follower and the shim, it can give you up to 2 thou discrepancy if you measure between the cam and the follower.

[anonymous-user]

Thanks
'Wear tight' so set them at the upper end of the range , ie the largest gap ?
Thanks

David

[PetrolHeadPete]

Contrary to popular rumor the gaps open when the engine's hot. I measured as much as 4 thou increase between cold and "just about cool enough to get the bolts out" without 3rd degree burns.