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Old 10-11-2000, 11:31 PM
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I have a 1979 240 D with 227,000 miles. When either down or up-shifting into 2nd gear there is a grinding sound unless I shift very slowly or double clutch. I am told this is a worn synchro on the 2nd gear. The interesting thing is that this grinding only occurs when the engine is warm. When the car is first started, I can drive several miles shifting normally. I am guessing that when the gearbox oil is cold, the viscosity is thicker and this somehow aids smooth shifting. My question is this: can I replace the gearbox oil with a thicker viscosity so that even when warm, the oil will be thick enough to allow a smooth shift? Any ideas?
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Old 10-12-2000, 07:58 AM
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Join Date: Aug 2000
Posts: 82
It probably won't help to change to a thicker oil. If the synchro is bad replacement or double clutching is about the only solution. Double clutching is cheaper.
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Old 10-12-2000, 09:36 AM
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Just a note to remind that a worn synchro is a pretty strong indication that the car has been driven by someone that signifcanty moves the shift lever BEFORE the clutch is fully disengaged.

I agree, changing oil will probably change nothing.

Good luck,

Larry Bible
'01 C Class, Six Speed
'84 Euro 240D, 533K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles
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Old 10-12-2000, 06:32 PM
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Join Date: Jan 2000
Location: New Bedford, MA USA
Posts: 1,583
Have this fixed ASAP. If you start losing pieces of the synchro dogs and rings, you will destroy your transmission

Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
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