PeachParts Mercedes-Benz Forum - View Single Post

t walgamuth · #4 02-20-2007, 06:12 AM

Quote:

Originally Posted by deportes

Thanks for the reply guys, the piston does not have a hole. I did take the head apart a few months ago and replaced the guide seals, the guides seamed tight but the problem that I thought was repaired by replacing the guide seals did not go away. I think maybe a ring on #8 piston is not working properly.
Does the guide could leak by if the piston is on TDC and the valves are closed?

the guide doesn't seal anything. it guides the valve so that the sealing surfaces of the valve and head align properly and actually seal. so no, with the valves shut the guide should be just sitting there and doing nothing.

a worn guide is often the source of some smoke on startup or on decelleration. being bad enough to cause plug fouling seems to be too much to be just a guide to me.

did you have any expert look at the cylinder walls when your head was off?

if i had a head off i would ask my favorite machinist to come look at it and perhaps measure for taper. a broken ring might also leave tell tale marks on the cylinder wall.

if the problem is just from wear, marks might not be evident to observe.

tom w