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Oil consumption and possible vacuum pump problems
I have been very pleased with the preformance, economy, and drivability of my '79 240D. I starts easily, has better acceleration than I was expecting and has given my 30+ mpg around town economy. This is saving me big $s comapared to my previous transporatation choises and I am enjoying driving for the first time in years. However, the oil consumption has seemed a little more than the power, startability and economy of the engine would indicate(about 1qt./ 800 mi.).
Today I was playing with a vacuum check valve that came out of the '80 240D that donated the engine. I found a lot of engine oil coming out of the vacuum pump side of the valve. I am now concerned that the vacuum pump may be in need of a rebuild. I might add that I cleaned the engine very well and installed new gaskets on the filter houseing, cam cover and lower oil pan before I installed it in the car and there are no oil leaks at all to be seen around the engine. I previously thought that the valve seals might be the cause of the oil consumption, but now I am concerned about the vacuum pump. Especially, after reviewing the thread about the timming chain failures and how a bad vacuum pump can lead to timming chain failures and wreck the engine. Any comments on the subject would be appreciated.
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Sedecrem 82 300SD 290k(needs engine swap) 79 240D 354k with new heart transplant w/220k 82 240D w/auto tranny soon to be manual 4 speed |
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Could be a failed diaphragm. Rebuild kit is not that expensive and it's about an hour and half job. Could be getting oil into the intake through the vent line that goes to the air filter if the diaphragm is torn. You should be able to see oil in that vent line with the engine running if the diaphragm is breached.
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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 |
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Its probably leaking more oil than burning, they usually are.
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No leaks
I cleaned the entire engine squeaky clean before installing it. Also, replaced lower pan, oil filter houseing and rocker cover gasket before installing it. I watch it pretty closely and doubt that it has leaked 1/4 teaspoon of oil past any external accesory in the last 5k mi. Thats why I am concerned about the vacuum pump, especially after finding some oil in the check valve. I guess I could be passing some oil around the valve seals as well, but they won't destroy the timing chain.
Will a vacuum test let me know if the diaphram on the vacuum pump is leaking?
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Sedecrem 82 300SD 290k(needs engine swap) 79 240D 354k with new heart transplant w/220k 82 240D w/auto tranny soon to be manual 4 speed |
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Here's a thread
That may help you. It's pretty long but there is some good info in there.
Suddenly leaking a lot of oil from air filter housing - Help!!!
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Sonny 86 190D N/A 2.5L Auto 265k "Ruby" -Sold- 79 300D 242k "Condi" my first -sold- RIP 2013 chevy sonic hatchback - had to for work Last edited by slarson80; 11-14-2007 at 02:58 AM. |
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A vacuum test may indicate nothing. Inspect the vent line from the vacuum pump. If there is oil in it you either have a leak past the diaphram now or this engine had one in a prior life.
There are only three possible sources of oil supply to your vacuum lines on your vehicle I believe. Most likely is the vacuum pump followed by the shut off on the injection pump. Last but least possibly is transmission fluid drawn up from the modulator valve assembly if you had an automatic. I am not positive it can happen on a 240 automatic yet iit is a source. I cannot think of any other sources of oil vaccum line contamination. Eight hundred a quart is not out of line if the majority of driving is primarily high speed highway driving. You are using 15-40 grade oil? Also outright failure of the vacuum pump resulting in engine destruction is not that common on a 240d. If you rebuild the pump just check the mechanical components of the pump for excess wear. A leaky diaphram from age and use is not unusual. It's amazing they last as long as they usually do. Last edited by barry123400; 11-12-2007 at 04:52 PM. |
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If you pull the v/p check for excessive end play in the timing device, that can kill a v/p and also go on to kill your engine with the broken bets of pump. The early type of pump is cheaper and easer too rebuild anyway.
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1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car" |
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Thanks for all the replies!
I looked at the line from the v. pump to the air cleaner and there is no oil there. Maybee the shut off valve on the injector pump was bad and replaced at one time. I think I am going to rebuild the pump anyway though. Just to be safe.
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Sedecrem 82 300SD 290k(needs engine swap) 79 240D 354k with new heart transplant w/220k 82 240D w/auto tranny soon to be manual 4 speed |
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Quote:
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1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car" |
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