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#1
03-24-2009, 05:21 PM
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Cold Compression test
Cold compression test on a non-starting OM617, ambient about 40F:
(psi) 280, 160 (200 w/ a little oil) 200 260 220 All injectors wet & nasty, all coked up so they get fuel but probably just piss it. Gave the valves a quick once over, I'll recheck #2, see if the exhaust is tight. Haven't reamed the GP's, bet they're nasty too. Deja vu, front of engine is caked w/ oil. Look like it's worth any more trouble? I don't need a winter starter, a 2 season car is fine. The interior is all shiny black faux leather.
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CC: NSA All things are burning, know this and be released. 82 Benz 240 D, Kuan Yin 12 Ford Escape 4wd You're four times It's hard to more likely to concentrate on have an accident two things when you're on at the same time. a cell phone. www.kiva.org It's not like there's anything wrong with feeling good, is there? 
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#3
03-24-2009, 07:18 PM
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Question for you.....I am seeking data points on 616/617 engines
When was last time this engine started and ran??
If so how well? #2 and #3 are below spec which I reckon should be a minimum of 220psi. What was the oil consumption? Good luck in any case. If it runs then fine. I agree with head gasket diagnosis.
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Dionysius
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#4
03-24-2009, 10:36 PM
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per PO, 2 years, smoky start, ok run. Oil use was 1 quart a week, which was out the front seal, I reckon, as the engine is caked w/ oil around the balancer.
Hadn't thought of the head gasket.
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CC: NSA All things are burning, know this and be released. 82 Benz 240 D, Kuan Yin 12 Ford Escape 4wd You're four times It's hard to more likely to concentrate on have an accident two things when you're on at the same time. a cell phone. www.kiva.org It's not like there's anything wrong with feeling good, is there?
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#6
03-24-2009, 10:42 PM
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Compression tests should be done on a fully warmed up engine. I did mine today by the "book".
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DJ 84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012 
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#7
03-24-2009, 11:38 PM
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Quote:
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1986 300SDL, 211K,Dealership serviced its whole life 1991 190E 2.6(120k) 1983 300D(300k) 1977 300D(211k)
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#8
03-25-2009, 12:00 AM
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I recently purchased an used engine and performed a cold compression test prior to attempting to start it. I couldn't run it long enough to warm it up since it wasn't in a car. My results were approximately 260 on #1 and about 350 on #2-5. It was about 70F outside when I did mine. Your numbers seem low to me, but maybe mine seem high to you.
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-Brian 1983 300TD 1982 240D 1981 280TE
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#9
03-25-2009, 12:35 AM
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I dont know if you interested but here are some of my tips for extending the life of a "rough" diesel, I put about a quart of ATF in the oil, for a few hundred km so that its fully circulated in the system. I do a lubro moly diesel purge. I also decarbonize the engine by useing a water spray misting bottle and spraying water into the turbo while the engine is running at 2500 Rpm for about 5 minutes. Once thats done I run a 5W40 sythetic oil. I personally have had good results with this technique.
Using water to decarbon the engine is a very old technique, Use your best judgement and dont hydrolock your engine. After these steps, I noticed much smoother running, much easier starts, better power, and less smoke.
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1984 Euro 300SDC, (4spd standard) 1986 Toyota Landcruiser Diesel HJ60 5spd X2 Gone but not forgotten (some sold, some stripped) 1983 300 SD, 1985 300 SD, 1983 240D, 1986 300 SDL, 1985 300 SDL, 1983 300 D, 1984 300 D, 1985 300SD, 1987 300 SDL, 1983 300 SD, 1985 300 TD Euro, 1983 380SEC, 1990 300 D, 1987 300D, 1982 300D, 1982 300D, 1994 E420, 1987 300 TD, 1987 300 D, 1984 300 D
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#10
03-25-2009, 05:49 AM
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A lot of oil pushing around seals can also be a sign of very loose bearings. Seals are only designed to control a certain level of leakage, and too much will simply overload them and it will run out like water.
My old book says that for reliable starting the minimum tested cold is 220#.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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