parkertseng

Hi

My Rennline lower valve has been leaking badly recently.
We use Victor Reinz gasket, but it seems gasket groove is deeper than the the gasket itself.
Had the feeling that the gasket is not compressed enough while tightening the bolts.
I read from reenlist that some others skimming a the surface of the valve cover to make it shallower.
Does anyone know how much is the depth of the stock valve cover groove or how much to skim it off from the valve cover?
Thanks

No_snivelling

I don't know the depth of the groove, but a general rule of thumb is that the squeeze on a rubber gasket should be 10% of its thickness.

cjoenck

You may already know this but the biggest mistake a lot of people make is to overtighten the nuts and not using a pattern that fastens the nuts evenly. The torque specs for these is a lot lower than you may think. Use a small torque wrench rather than relying on feel. I don't have a reference handy right now but it's easy to find.

Rocket Rob

The torque spec is 84 in-lbs. You definitely need to use a small torque wrench. Its very easy to over tighten.

cobalt

Did you clean the crud off the cam tower before installing. Dirt can get trapped and cause them to leak. This is a common problem I find.

Spokes

Think you are missing a decimal point, metric…10nm.

​​​​​​…or maybe not, imperial so confusing

Rocket Rob

84 in-lbs or 7 ft-lbs is equivalent to 9.5 nm

cobalt

The factory spec book calls out 7 ft pounds or 9.7nm if that helps. You should be able to feel when they snug up which will be about correct when checked with the torque wrench.

Spokes

Thanks Rob, I stand corrected, but to be honest, I only look at the metric column in the work shop manual. And being a German car, it prefers metric

das76

@parkertseng any updates? did you solve this?