PeachParts Mercedes-Benz Forum - View Single Post

whunter · #5 01-17-2014, 04:18 AM

Quote:

Originally Posted by Rooster300SD

Air is definitely leaking into the cylinders on either side.

Checked for flatness & cracks when the valve job was done.

New head bolts, but as I was putting them in halfway through I
realized I forgot the washers!! So I pulled them out and put them back in
correctly. Maybe that's the cause of my problem?

Also, after the HG was put in, the car sat for a while before it was started
while I worked on other stuff.
Someone told me he likes to get the gasket in and start it the same day
and that makes a better seal?

Jeff

Did you wait at least ten minutes between torque step 2 and 3, and again between step 3 and 4 ?
This is critical to allow the "torque to yield" bolts elongation/set time.

FYI:
On the cylinder head I torque, paint mark, torque, paint mark, torque, paint mark, etc, every fastener, using a different color for each step.
1980 240D CRACKED cylinder head + cavitation damage
This eliminates concern from possible "under" or "over" torqued fasteners.

I hope I am wrong (deceived by a poor quality picture).
Looking at your picture, it appears the cylinder head face was sand blasted ?
Most sandblasting aggregate is too aggressive for the cylinder head, and will remove metal in uneven patterns from the sealing surface/mating surface = ruin the smooth even surface = cause leaks.

Here is a head and block face cleaned the IMO correct way.
1985 300TD head gasket repair

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