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#1
12-31-2005, 11:48 AM
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OM617 IP, oil leak from fuel pump gasket
I removed the fuel pump from the IP 3 months ago, to fit the new primer pump. Since then, I have had a continuous oil leak from the gasket between the fuel pump and IP body.
One drop of engine oil leaks from the joint every 10 seconds while the engine is running, regardless of what I do: I replaced the gasket - oil leak continued. I replaced the gasket and used silicon gasket material - oil leak continued. I made a cork gasket - oil leak continued. I made another cork gasket and used silicone gasket material - oil leak continued. What am I doing wrong? How can I fix the leak? Is an "O" ring the answer? SWMBO's car is the offender and I am under pressure to stem the flow of oil onto the driveway. HELP ME PLEASE. ps, I did search, but despite quotes, the search engine does not search for phrases, just multiple words [grrr]
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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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#2
12-31-2005, 01:05 PM
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Why did you have to remove the whole fuel pump just to replace the primer pump?
How tight are you tightening the bolts? factory spec?
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#3
12-31-2005, 01:12 PM
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I had a small crack in the body of the pump on my 300D, allowing air into the system. Is it possible you cracked the pump body when you reinstalled it?
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#4
12-31-2005, 03:54 PM
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Other thoughts
This link may help.
Oil Leak location?? http://www.peachparts.com/shopforum/diesel-discussion/39507-oil-leak-location.html#post225076
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/
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#5
01-04-2006, 11:13 AM
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Thanks for the suggestions.
On the '84 300D is this IP.  As you can see, there is a side cover, behind the fuel pump (removed to repair the oil leak). There is a neoprene gasket to seal this cover. Unfortunately, when this was fitted, one of the set screws must have caused the gasket to twist slightly, allowing the gasket seal to be tenuous at best. The neoprene has moved from the part which provided the tenuous seal, resulting in the leak. This allowed one drop every 5 - 10 seconds while the engine was running. I have used silicone gasket maker to seal the side cover and for once SWMBO's car is not marking all of the spots on her journeys. It was getting so bad, that the EPA were following the trail of oil spots down the highway  It wouldn't have been long and the car would've joined the dots for them
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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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