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Old 12-18-2005, 08:55 AM
Ramblin's Avatar
Part Time Hack
Join Date: Dec 2004
Location: Ware Massachusetts
Posts: 358
Crankshaft Oil Leak (I think)

As a fairly new owner of an 83 300CD (last year) and contributor to this forum I am finally faced with what I think is a fairly complicated repair on my car...The car is high mileage but had an engine replacement with a great engine (starts great in cold weather) but it is leaking oil near the front of the engine...I assume it is the front crankshaft seal and I am not sure it is that major but it is causing the oil levels to go down. As a fairly anal car owner my thought is to repair this but I believe there must be special tools needed. I consulted the official CD manual but did not find a very detailed description. Anyone in the forum had experience with this repair and offer suggestions..Thanks

83 300CDTurbo 307,000
2005 Honda Element 266,000
56 Nash Ambassador Country Club Special 34,000(under restoration presently)
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Old 12-18-2005, 09:27 AM
Registered User
Join Date: Jul 2004
Location: Illinois
Posts: 222
This should get you started.

Failed 123 Diesel Harmonic Balancers

1993 300TE
1984 300D
1984 300SD
1976 BMW R90S
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Old 12-18-2005, 09:32 AM
t walgamuth's Avatar
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 35,919

tearing it apart be sure where the oil is coming from.

tom w
[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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Old 12-18-2005, 11:14 AM
Join Date: May 2002
Location: Blue Point, NY
Posts: 25,396
Why assume it's a crankshaft seal?

The SD was leaking plently of oil from the oil cooler lines.

The drain from the air filter housing can also leak. The turbo drain line is also a source of leaks at the front of the engine.

Get it thoroughly cleaned off (a miserable job) and look for the source.
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Old 12-18-2005, 01:35 PM
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Registered User
Join Date: Dec 2002
Location: Colleyville, Texas
Posts: 2,694
Tracking down my oil leaks I did the following.

Turbo drain and oil pan.

Replacing Turbo Oil Drain Seals / Gaskets - Help

Oil seperator check valve which includes the oil pan gasket.

617 engine, replacing the oil separator check valve in the upper oil pan.

Front crank shaft seal.

Replacing the 300TD front crankshaft seal and other front of block oil leaks

The front crank seal R+R does require a seal tool. $55 or so from Sir Tool (M0061). Mandatory, probably not, but its pretty cheap and it does the job corectly.
Doing the Front crank SUPPORT does require a special alignment tool that Sir tool does sell. Mercedes Tool # 617-0014. I was able to borrow the tool from the dealer.


1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car
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