valve clearances cam covers

[doyle]

hi guys

only done it once at college and need a quick recap on checking valve clearances with cam covers
I know how to do valve clearances with the adjustable nut on straight forward valves and as far as a ican recall the cam covers are thickness of the valve clearance
so is it a case of take out the cam covers check clearance then replace cam covers to the correct thicknes or do I simply use feeler gauge between cam cover and camshaft/rocker
as I say only dun it once so a little help would be appreciated
terry

 

[Burnerman]

Valve clearances are set between the heel (back) of the cam and the valve lifter.....which could be a rocker or follower. This is for OHC engines.
For OHV engines, the clearance is set between the rocker arm and the valve stem.
A feeler gauge is used in both systems, and adjustment can be by shim or stud and locknut.
John

 

[mfarrow]

For shims.

Be aware that if the shims are under the lobe then they will wear with each lobe pass. So check their thickness with a micrometer when removed instead of reading the stamped thickness from the shim itself.

 

[mfarrow]

so is it a case of take out the cam covers check clearance then replace cam covers to the correct thicknes or do I simply use feeler gauge between cam cover and camshaft/rocker

Feel first for thickness.

Take out old shim and measure.

Buy new shim to make up thickness to requirement.

Replace shim and feel again for compliance.

 

[Burnerman]

Discuss the tapered screw system used in the OHC Vauxhall Victor engine.....and watch him turn grey ( if he's old enough)
John