My 1980 300td, is somehow drawing auto trans fluid into the exaust manifold and causing a bit of smoke at higher speeds.What part in failing,could be causing this? Thanks Michael r

Bad vacuun modulator sucking fluid out of the tranny and blowing it down the intake, or a leaking cooler line dripping on the exhaust. Only way for it to get in there.

However, ENGINE oil can get into the exhaust form bad seals on the turbo bearings, if you have a turbo.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!

thanks for the reply. Mine is not a turbo, the smoke Is coming out of the tail pipe. What color is the modulator,? and where is it located. Thanks again. michael

Transmission vac modulator is on the passenger side, I THINK, haven't looked on that particular model.

Follow the while plastic hose from the vac switch on the valve cover or IP to the modulator. If you pull the hose off, it will have tranny fluid in it if the modulator is leaking. If it's clean, it's not the modulator, the smoke is from somewhere else.

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!

If the modulator was leaking fluid, it's more likely that you'd be asking about hard shifts as opposed to smoke. Anyway, I don't think that transmission fluid can make it to the intake on MBZ diesels.

BTW-What color is that smoke?

FYI-The modulator is on the driver's side on the 722.xxx trannies. You should pull the vac line that runs from the IP to the modulator and see if there's fluid in it.

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Never a dull moment at Berry Hill Farm.