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New Owner needs some help.
I've spent the past 3 hours reading posts and my head is spinning from way too much information (I don't know where to start). Any way here it is. I bought a 92 300D 2.5 Turbo Diesel about 2 months ago, with the hope of converting to WVO some day soon. It was great on the day I test drove it, but has quickly developed some issues.
1. Shifts hard when under heavy load, and exhibits "transmission flare" under partial load. 2. I thought A/C worked when I bought it, but was a cold day. Seems to be basically non-existent now. 3. Over the past few weeks it has begun to blow more and more blue smoke. At first it was just a puff leaving my driveway in the morning. Now its a big cloud as I leave a stop light, or let off the gas after accelerating quickly. #3 is the top priority for me right now. From what others have described through my readings it sounds like worn valve guides, but before I take the plunge into changing them, I'd like to check the more mundain items. I'm going to check for turbo wiggle right now So what should I look at first, second, third? I know there are a million and one posts with similiar problems, but for someones first trip to the boards its a little overwhelming. Any advice would be greatly appreciated. Last edited by hendu; 05-02-2005 at 10:03 PM. |
#2
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I took off the hose from the air-filter to the turbo to check for play in the turbo shaft. There wasn't any play in the shaft, but there was a fresh coat of oil around the turbo inlet. I assume that it came from the hose that comes from the valve cover to the turbo inlet hose (blow by?)
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#3
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300 stuff
i always look to the simple things first. have you changed the oil? if not so that and use a good diesel rated oil such as rotella. it does sound as if a seal could be going out in the turbo (not a simple thing). the oil past the valves thing would not come on fast but very gradually over time. the ac and tranny both can easily be vacuum leaks. (a simple thing). good luck.
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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. |
#4
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blow
yeah it could be blow by. everyone says to disable the exhaust gas recirculator. that i dont think is directly related to your problem, but is probably a good idea in the long run.
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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. |
#5
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knowing you milage would be useful in diagnosing your problem.
dont disable your EGR yet, fix the problem first. besides, disconnecting the vacuum from the EGR in that engine will dump all of your boost, you have to do something more complicated involving alot more work. the transmission problem is a vacuum leak, which could also affect the a/c, but i think its more likely that you have a refridgerant leak, probably in the evaporator coil, this is common in the 124 and expensive, but you could have a leak somewhere else. if it was blowing cold when you bought it, the seller might have known about the leak and filled the freon before you drove it, it lasts for a couple days even if theres a leak, this is a pretty common practice for scumbags, but i dont know who you bought it from so theres no real basis for that accusation, just a possibility. it might have been just a cold day like you say. regarding the blue smoke, that means your burning oil, but only if its blue. if its black smoke, its totally normal.
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1991 300 D 2.5 Turbo, 220k also in the family: 1981 240 D 185k 1991 350 SD 185k 2006 S 500 2005 SLK 350 |
#6
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Quote:
there shouldnt be any oil on the intake side of the turbo (at least ive never seen any in mine) your oil might be overfilled, that might also cause the blue smoke.
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1991 300 D 2.5 Turbo, 220k also in the family: 1981 240 D 185k 1991 350 SD 185k 2006 S 500 2005 SLK 350 |
#7
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Quote:
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Sounds more like blow-by at the rings or possibly the valve guide seals. Are you getting a bunch of crankcase pressure when you remove the oil cap while the engine is running?
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#9
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Quote:
Any oil vapour entering the inlet manifold will be burned as fuel and will not leave smoke. White smoke will be oil from the turbo seal leaking into the exhaust pipe. Check inside the exhaust for oily soot. Is there much oil deposited on the back of the car?
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Tony from West Oz. Fatmobile 3 84 300D 295kkm Silver grey/Blue int. 2 tank WVO - Recipient of TurboDesel engine. Josephine '82 300D 390kkm White/Palamino int. Elizabeth '81 280E, sporting a '79 300D engine. Lucille '87 W124 300D non-turbo 6 cylinder OM603, Pearl Grey with light grey interior Various parts cars including 280E, 230C & 300D in various states of disassembly. |
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Transmission
Have you checked your transmission fluid exactly as it says to in the manual? One day out of no where mine started mysteriously flaring slightly. I hadn't checked the fluid in a few months and after checking the fluid as the manual said several times I discovered it was bellow the minimum mark on the dipstick. I added about half a quart and it cleared the problem right up. The hard shifting probably is a vacuum leak because when I broke one of the tiny hoses coming off of the brake booster it would shift crazy hard. Good luck!
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Seth 1984 300D 225K 1985 300D Donor body 1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!! 1980 300SD 311K My New Baby. 1979 BMW 633csi 62K+++? Dead odo |
#11
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Thanks for all the replies. I'll check everything you guys have suggested when I get back in town, but I know right now that there is a lot of soot on the tail pipes, not really on the car itself though.
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#12
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Quote:
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1991 300 D 2.5 Turbo, 220k also in the family: 1981 240 D 185k 1991 350 SD 185k 2006 S 500 2005 SLK 350 |
#13
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#14
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Hendu,
The 5 cyl is more than a 4 cyl with another cylinder. The crank throws IIRC are offset by 144 degrees. Thus, with #1 at TDC, one cyl would be @ 288' BTDC, one @ 144' BTDC, one @ 144' ATDC, and one @ 288'ATDC.
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Tony from West Oz. Fatmobile 3 84 300D 295kkm Silver grey/Blue int. 2 tank WVO - Recipient of TurboDesel engine. Josephine '82 300D 390kkm White/Palamino int. Elizabeth '81 280E, sporting a '79 300D engine. Lucille '87 W124 300D non-turbo 6 cylinder OM603, Pearl Grey with light grey interior Various parts cars including 280E, 230C & 300D in various states of disassembly. |
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Tony thanks for the education. When I got back in town today I wanted to at least get something done so I decided to take off the valve cover to see how things looked. I found a bunch of oil in the pipe over the valve cover that goes from the turbo to the intake manifold. So it looks like oil is definately getting burned and not just discharged out the back of the turbo. It LOOKS like oil is going from the valve cover to the turbo inlet then into the intake manifold. I got a valve stem seal kit and will try and see if I can make some headway on that tomorrow. Thanks for the input everyone.
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