[W126 Coupe] What do you think?

[Chet Hwilka]

155 seems a bit low.  Does the engine smoke?  If so, all the time or just on
initial start up?  How's your coolant?  
Head gasket could cause oil and/or water to find its way into the cylinder.
Valve guide/seals cause oil to leak down into the cylinder and cause the
smoke on start up.
Rings, you might have smoke while driving.  Unless the engine was abused and
oil changes were few and far between, the piston, rings, lower-end should be
good.  From what I understand, that end of the engine is very sturdy..

My problems were on the top-end, which is fairly common at that age.  
http://home.comcast.net/~chwilka/cylinder_head_removal_and_replac.htm

Chet

-----Original Message-----
From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]
On Behalf Of Kirby's
Sent: Tuesday, July 14, 2009 10:20 AM
To: mbcoupes at mbcoupes.com
Subject: [W126 Coupe] What do you think?

1989 560 SEC, 140K miles
just started using quite a bit of oil. No leaks on the ground.
Spark plugs look OK
Seven cylinders measure 155 for compression
Second cylinder back on the drivers side measures 95
What do you think is wrong?
How do I determine for sure?
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