I pulled the head off and the pistons out yesterday and the sides if the
cylinder walls were totally smooth and polished, NO cross hatch marks at
all, #1 piston had spun a bearing and the crank is a little scratched,
which I think can be repaired. The rod is somewhat discolored about 2'' up
from the big end., which proly means replacement, hopefully I have one the
same weight in my spare parts bin. There is no ridge at the top of the cyl
walls but my plan is to have the block bored for o/s pistons. So far the
valve guides look good but will finish checking them out today.
Steve
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From: Peter Frederick <[EMAIL PROTECTED]>
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Subject: Re: [MBZ] Whats this stuff on my 240D
Date: Sun, 2 Oct 2005 10:21:16 -0500
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Message: 4
The vacuum gizmo is the egr controller, you can discard it since you don't
have one. There will also be an EGR valve on the intake manifold.
The pipe going into the oil pan is the drain from the oil separator in the
air filter housing, all W123 diesels have one.
Likely the rebuilder put WAY too much clearance on the valve guides, unless
familiar with Benz practice. Easy way to check is to pull the cam and
remove a couple valve springs. If the valve will preceptibly move sidways
when lowered down off the seat, there is too much clearance.
The other likely problem is way too much piston clearance, and that you can
only check by taking them out. Should be 0.001", very tight. You can
check for wear by pulling the head (as I'm sure you will be doing).
Unless run out of oil until the engine seized, likely the crank and rods
are fine, they don't cause problems in that engine. Pistons may be shot,
too, if there was excessive clearance, it causes the rings to flex sideways
and extrudes the ring lands.
Peter
