Thread sealant for cam housing to cylinder head bolts?

[burgermeister]

Do these bolts get some sort of thread sealant? Bentley does not mention it, but the threads in the head are a through-hole - so the only oil seal is the captured steel washer under the cap screw head.

[burgermeister]

[Flat6pac]

If you installed the 574 correctly there should be no leakage.
Bruce

[Reuben.L]

The factory workshop manual does state to apply 574 to the bolt threads.

[burgermeister]

That, then, would be why they were such a bear to remove ... thanks!

Well, removing & 574-ing one at a time ought not be too bad.

[Flat6pac]

I’ve never seen sealant on the threads of any factory motor I’ve ever taken apart...
Bruce

[Reuben.L]

Originally Posted by Flat6pac

I’ve never seen sealant on the threads of any factory motor I’ve ever taken apart...
Bruce

I also found it weird, but i read it during a reassembly on the first 993 engine ive rebuilt just last week. Remember 993s are the only road car engine (that i know of) that use bolts in this area, not studs.
I only sealed the outer bolts as they are through bolts, the inner row are blind holes.



see the installation note 1

[prschmn]

Good picture of the areas to be sealed but missing required sealant around some
of the holes-remember that some of the studs are inside the valve cover and should have sealant as well.