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#1
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Checked compression today...
Did a compression test on my 300D. Warmed up the engine to the operating temp. Let it sit for a little while until I was able to handle it. Removed the hard lines, glow plugs. Reamed them all out - was meaning to do that for awhile - they were REALLY carbon-packed...
Started doing the compression test through the GP holes, but quickly realized that the space is too tight in there so switched to Injector holes and continued. Replaced the heat shields as I re-installed each one. Anyway, here are the numbers (psi): #1 350 350 #2 320 315 #3 300 300 #4 300 305 #5 305 305 Think these numbers are pretty good - wonder what others think... Was under the impression that anything above 220 psi is within spec. It was a little concerning to find some oil around the injectors and heat shields when I pulled the injectors off... Also #2 and #4 GPs were oily and wet... not sure if that's normal - but I guess since the compression is not perfect maybe it's just the way it is.....
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1987 Mercedes 300SDL; SOLD 1985 Mercedes 300D; SOLD 2006 Honda Pilot - wife's ride; 122K; 1995 Toyota Land Cruiser - 3X locked; 182K |
#2
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i was under the impression that anything above 320 was alright, not 220
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1981 300SD 512k OM603 |
#3
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220 isn't even enough for the engine to start. My 240's 616 had 200-250 across the board and it wouldn't even start with ether.
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#4
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I would say that it is not real good
I think real good is another 100 plus pounds up, at around 425 with very little variation. I think 305 to 315 is way too low. How about the valves. Have they been adjusted recently. You might find a valve adjust will really change things.
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Junqueyardjim Christianity, if false, is of no importance, and if true, of infinite importance. The only thing it cannot be is moderately important. C.S. Lewis 1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA 2003 Jaguar Type X, AWD. beautiful, good mileage, Mom's car, but I won't let her drive it! |
#5
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I'd say their fine. Numbers are going to be lower at your altitude. My SD showed around 330psi dead cold and it runs fine. I think MB says 220 is a minimum to run.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#6
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what fitting did you use
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1985 300D - 599,xxxk - blue interior #265 Monark Nozzle, AL129X, 15" Ronals, Gen II Big Brakes hunting 1985 300D - 491,xxxk - in prog-{A-A IC, 3" exhaust, psi\pyro, 28*BTDC, Hella Euros, IP Limiter removal 1985 300TD - 783,xxxk - parts car,used new engine with ALDA cap inplace 1987 Kenworth T-600 8LL 425 CAT Mech. - 6,000,000+k - DEI exhaust wrap, punched through resonators, 1 recent rebuild, |
#7
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I agree. My engine is 320-350 and can start at -20*f with only glowplugs.
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#8
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Fitting...
Used a Compression check tool for diesels from Harbor Freight (around $35)... it has a number of fittings that you can choose from...
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1987 Mercedes 300SDL; SOLD 1985 Mercedes 300D; SOLD 2006 Honda Pilot - wife's ride; 122K; 1995 Toyota Land Cruiser - 3X locked; 182K |
#9
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You can check it thru the glow plug holes using the 90 degree fitting in that kit.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13 |
#10
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My book says 220 cold minimum.
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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. |
#11
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Oil on the gp's doesn't sound good, did you brush them on something when you removed them? A little oil leaking from the cam cover is quite common.
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83 SD 84 CD |
#12
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Hey all,
What is considered oil on the GPs? Actual oily buildup? I took out my old loop style plugs last week and they were black, but not oily per se. |
#13
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Black is burnt carbon, normal.
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83 SD 84 CD |
#14
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If it starts and runs OK, and you've adjusted the valves recently, why worry? It's silly to re-ring, rebuild or replace the engine, (corrective action for low compression) isn't it?
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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? |
#15
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if you reamed the glow plug holes before the compression test you may have got some carbon particles on the valve seats while cranking the engine.If it starts and runs OK i wouldnt worry too much about it,however if you feel that it is not running good then perhaps another compression test is in order. Don
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Red Green "This is only temporary,Unless it works!" 97 E300D 157000 miles 87 300TD ?141k? miles |
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