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1995-2002 Range Rover P38A
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359 Posts
Discussion Starter #1
Quick question, When, for example, 0.5mm is milled from the heads, how thick should the shims be under the pedistals?

For some reason (the valves become lower in the engine), I think the shim shouldn't be 0.5mm.

If someone knows the answer saves me from figuring this out, wasn't a fun job. ;)

Thanks
 

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2013-2015 Range Rover Sport
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159 Posts
Typically when resurfacing you will not need to make any adjustment to the pedestal or the pushrods but it sounds like you went with a large cut off the head to increase compression. The ratio of rocker throw to the lifter it is about 1/3. You should start to assemble and check the lifters. If you need to correct the lash then you can purchase replacement pushrods of varying lengths.
 

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Premium Member
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1,333 Posts
If you do need shims, 0.5mm would be a good starting point. The pushrods are almost perpendicular to the head, so the rockers will move towards the cam the same distance you skim of the heads.
But do test the clearance before shimming, as explained in the link. This also specifies the ratio of pushrod vs valve movement.

Filip
 
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