Hi Kevin -
It all depends on how bad the rings are - engines don't always do what you
think they will do. I know what you mean about the sound of the starter,
but compression to start the engine vs compression to allow the starter to
spin easily are 2 different things - having very low compression isn't the
same as having all the GP's removed. An engine showing zero on the gauge
usually still has *some* compression - enough to put pressure on the
starter.
On the W123 it's reasonably easy to test the compression - not like a W124
where the intake manifold must be removed for access. If possible - that'll
be your best test of the engine - but for the price of 5 GPs you can
eliminate part of the problem.
Hopefully the starting fluid didn't do any damage to the precombustion
chambers - but until you get back to the engine and test some stuff we're
just guessing. With the temp low lately, even an engine with decent
compression will be hard put to fire up with non-functioning GPs. The good
thing about buying 5 GPs is you can use them eventually or on another MB
diesel. And checking the relay is easy - a test light will show if there's
any voltage going to the GPs. hook up the test light and time how long it
stays lit. Will give a good idea of how well the relay is working. Of
course there's other problems a relay can have (staying on too long or
coming on after the engine is running, etc) - but the biggest problem can
be tested like above. If you determine the relay is working and put new GPs
in (you could take them out of your 300SD) then you'll *know* if the problem
is internal or has been fixed by replacing the GP's/
I always get suspicious when someone says the engine was rebuilt - it can
mean different things to different people. Or perhaps the PO misunderstood
what he heard and paid for -- perhaps the IP was rebuilt or maybe the vac
pump - ask if he has the receipt/s - it'll usually be more than one page if
detailed --
Good luck - I hope my writing is coherent - sometimes I leave out words ;-\
Larry T (67 MGB, 74 911, 78 240D, 91 300D)
www.youroil.net for Oil Analysis and Weber Parts
Test Results http://members.rennlist.com/oil
PORSCHE POSTERS! youroil.net
Weber Carb Info http://members.rennlist.com/webercarbs
Porsche Road Test http://members.rennlist.com/roadtest/
.
----- Original Message -----
From: "kevin kraly" <[EMAIL PROTECTED]>
To: "Mercedes Discussion List" <mercedes@okiebenz.com>
Sent: Monday, February 12, 2007 5:20 PM
Subject: Re: [MBZ] Black '85 300D update
Larry,
If low compression or no compression on a cylinder or 3 is the situation
with this car, wouldn't it be obvious due to the sound of the starter?
When
it's coming closest to starting, it sounds like it's catching on 3
cylinders
out of 5. I do have a compression tester. This may be the best way to
assess the condition of the engine if he'll let me do it.
Kevin in HIllsboro, OR
1983 300SD 266K miles, Ursula
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