I have 92 300D turbo with 298K miles. Lately, it blows a LOT of blue smoke through the exhaust. Engine runs and sounds OK, car is still drivable, but something has failed in the engine. WHere to start? Valve train? Timing chain? Thanks, Kevin

Sounds like engine oil. Was this "all of a sudden"?

It could be valve stem seals, worn rings, worn turbo seals, etc.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Yes, definitely engine oil. I can smell it. It happened suddenly. What do you know about replacing valve stem seals? After 289K miles, they are probably worn. (Not sure about engine compression... have not checked it.)

Would removing the cross over pipe eliminate the turbo oil seal cause? Have you tested for blow by? Oil cap test?

Whats your oil pressure?

My 1990 300D had no teeth on the oil pump sprocket at 283K miles.

Good luck!

__________________
James
Jet Engine Design Engineer with a car problem
(I just wish it was curable!)

1990 300D 294K miles
1987 Vette 101K miles (4+3)
2003 HD Electra Glide 65K miles
1992 Ford F150 300 I6
2000 Suzuki TL1000R Human Missle Machine!

Not much, as I have not has to do it yet.

Do check compression. Valve stem seals tend to seep more overtime, not all of a sudden.

__________________
RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Trying to think of things that would occur suddenly, causing a lot of smoke yet leaving the car drivable. Has this problem affected oil consumption and if so can you give us some numbers (miles per quart)?

The later 60x engines are not supposed to have the head or head gasket problems of the 603 but you could have a head gasket failure or a cracked head such that a cylinder is sucking in oil from a passage to the head. A cracked ring would also cause smoking but probably not as much as you are seeing (pictures?).

Jeremy

__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

Lots of 602s blow head gaskets. I'd say that's the first thing to check except you can't really check without pulling the head. If there's an oil leak between the head and block around the #1 exhaust runner, I'd say bite the bullet and pull the head.

Sixto
87 300D