Re: [MBZ] stuck piston ring

[Jim Cathey]

Motor uses 1 qt of M1 15w50/100miles. Before I have valve stem seals 
done I
thought I'd try this. This is a V12 gas motor. Runs strong with ALL 
kinds of

power. Just burns/uses oil and has a noise in there.


Dunno about the noise, but our 450 SL made clouds of oil smoke, and
the problem was only the stem seals on #2.  Which I did myself in the
driveway in about an hour.  Never did replace the other seals.  (After
six+ years it still doesn't use oil or foul plugs anymore.)

-- Jim

Re: [MBZ] stuck piston ring

[Peter Frederick]

Find someone with a borescope to check the cylinder wall through the 
spark plug hole -- a stuck ring on this engine can mean a rebuild job 
if the cylinder wall is scored.


If the cylinder wall is OK, I would add a small amount of ATF to that 
cylinder only and let it soak a couple days. Then rotate the engine to 
clear it (spark plug out) and attempt a restart.


The main problem with stuck rings is that they then scrape the cylinder 
walls badly, and that cannot be fixed by freeing up the rings again.


Peter