cylinder head minimum height
cylinder head minimum height
(OP)
Hello All!
I need to skim the cylinder head of my car. From some documentation I've found out that the permissible minimum head height 107 mm. Currently the head has 106,95 mm and I need to take 0,04 mm. The guy at the workshop says there is no problem going below the 107 mm, he told me they will cut the valve seats the same amount.

My question is, if there is no problem going bellow 107, why does this minimum height exists in the brand manuals?
I need to skim the cylinder head of my car. From some documentation I've found out that the permissible minimum head height 107 mm. Currently the head has 106,95 mm and I need to take 0,04 mm. The guy at the workshop says there is no problem going below the 107 mm, he told me they will cut the valve seats the same amount.

My question is, if there is no problem going bellow 107, why does this minimum height exists in the brand manuals?





RE: cylinder head minimum height
Do you know when and why it was already milled to 106.95 ?
Does that may some bearing on why you have it apart now?
One reason for restricting the amount to be milled from OHC engines' heads is that warpage on the bottom is a good match for distortion in the cam bearing bore "main line." Some shops routinely "straighten" curley OHC heads as a first step since it improves the cam bearing bore co-linearity and reduces the amount required to flatten.
RE: cylinder head minimum height
I got a leakage from combustion gases into the cooling circuit, and decided to take the head out myself. There are some pictures in the next link:
http://s797.photobucket.com/user/stroj/library/AR%...
The guy at the machine shop told me that, due to the machine pattern in the surface of the head, it never had been skimmed before. On the other hand, the present height doesn't suggest that.
Never thought about the distortion on the cam bearing bores.That could lead to some premature wear?
RE: cylinder head minimum height
Is the deck of the block level? Are thicker head gaskets available to account for milled heads?
RE: cylinder head minimum height
RE: cylinder head minimum height
RE: cylinder head minimum height
RE: cylinder head minimum height
RE: cylinder head minimum height
To RossABQ
It is using already the thicker gasket. I measured the protrusion of the pistons to confirm it was the correct one.
I decided to mill the head. I assembled everything and it is working fine. Already counting 1990 km
Some pictures of interest:
-> Milled head:
-> Gasket in place:
-> Flushed, cleaned and lubricated lifters with rockers in palce:
-> timing marks
->running test