I think you are chasing a straw dog. If the compression is that low,
the effect of starter speed will not get it into usable range. Maybe
10%. That would take it from 220 to 242, and that is still a worn
out engine, bad valves or rusty cylinder walls. The safe route is to
assume it is a worn out engine.
Since it was sitting, the compression may or may not improve after
use. It is still safe to assume it is a shot engine.
Does the starter have good/plenty of elec pwr to it - good battery?
Wilton
----- Original Message ----- From: "andrew strasfogel" <[email protected]>
To: "Mercedes Discussion List" <[email protected]>
Sent: Wednesday, July 07, 2010 12:00 PM
Subject: Re: [MBZ] Interpreting compression test results for
W123turbodiesel engine
Does everyone agree with this? If true, is there any practical way to
bypass the starter??
On Tue, Jul 6, 2010 at 10:12 PM, Kaleb C. Striplin <[email protected]>wrote:
If the starter is not spinning as fast at it should, this test means
nothing at all.
andrew strasfogel wrote:
I need a second opinion on the following account of a compression test
from
the seller of a 1985 300TD wagon. He himself is a tech and administered
the
test (he's not a Mercedes tech).
"Here are the compression results (the highest reading from each cylinder)
with a warm engine, jumped battery [after a valve adjustment]. On #3 the
adapter fitting was leaking so re-tested most if not all by snugging up
the
adapter with a socket first, this evened things out significantly. I did
them on eight compression cycles each. They are lower than I would like
to
see but I believe it is because of a slow cranking speed [allegedly due to
a
tired starter motor]. There is, however, no way of really knowing this
for
certain unless the slow cranking [due to starter?] was replaced and
another
test was conducted. The readings:
Cylinder 1- 220-225
2- 220
3- 200
4- 210
5- 230
Also noticed when adjusting the valves a very minute nick (1-2mm) on the
edge/side of the #1 cam lobe. It is nothing that I would have any concern
over at all but just want to disclose everything I see..."
My mechanic says the readings are way too low to allow the engine to start
in cold temps due to worn rings. He says a new engine rates at 400, and
that 275 is the absolute limit. Any comments? BTW, the car has 300+ K
miles, has been well maintained, and hasn't been driven for the past year
due to rust issues.
TIA,
Andrew
1983 300TD
1985 300 semi-TD
(I sold the 280SE 3.5)
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--
Kaleb C. Striplin/Claremore, OK
95 E300, 94 S500, 92 500SEL, 92 300SD, 92 300E 4Matic, 91 350SDL, 91 300D,
89 560SEL, 87 300SDL x2, 85 380SE 5.0 Euro, 85 190D, 84 190D, 84 300D euro
manny, 76 240D, 76 300D, http://www.okiebenz.com
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_______________________________________
http://www.okiebenz.com
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To search list archives http://www.okiebenz.com/archive/
To Unsubscribe or change delivery options go to:
http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
_______________________________________
http://www.okiebenz.com
For new and used parts go to www.okiebenz.com
To search list archives http://www.okiebenz.com/archive/
To Unsubscribe or change delivery options go to:
http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
_______________________________________
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For new and used parts go to www.okiebenz.com
To search list archives http://www.okiebenz.com/archive/
To Unsubscribe or change delivery options go to:
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