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  #1  
Old 08-31-2003, 11:20 AM
YCAGWYW
 
Join Date: Jan 2002
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Question Consequences of Overfilling Transmission

Quickly asked, ...what are the consequences of having overfilled and driven, albeit unknowingly, a transmission in an 83 300TD?

Thanks....

*explaination... I bought the car, as a rustfree upgrade for my other 300TD and at a price which "helped" me overlook the fact that I found that the previous owner had overfilled the tranny. The tranny has, from the beginning, flared between 2-3 and 3-4, and in exploring the trouble, I have found that the rubber "dust cap" on the Vac Mod was torn, (new one on way) In attempting to adjust Vac Mod to reduce flaring, I have also found that the metal stem of the "T" adjuster in the Vac Mod was rusty. Does this suggest that a new Vac Mod be installed? Does the "dust cap" actually help contain vacuum or is it simply there to keep the adjustment "T" clean?

Thanks again...
Frank................still looking for a good diesel mechanic in the "east of Columbus, Oh" area.

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  #2  
Old 08-31-2003, 03:26 PM
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Having to much fluid can raise the pressure inside which will eventually lead to blown seals. The reason a tranny flares is not having enough pressure in the valving, typically from fluid blowing past a seal in the valving because the seal is old and hardened. This pressure missing makes for a longer shift and there you have it, flaring, the wonderful gap between two gears. If there is way to much fluid it could cause foaming, this will make almost no protection to the transmission and cause slipping.
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Last edited by BoostnBenz; 08-31-2003 at 03:31 PM.
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  #3  
Old 09-01-2003, 05:05 PM
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Location: Evansville, Indiana
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Overfilling will cause foaming if the fluid reaches the gear sets. The foam will cause the tranny to slip and overheat (compressed air is "springy" unlike pure hydraulic fluid, so the clutches slip, and it won't transfer heat worth diddly, so the cooler doesn't do much). Driven for a while like this, espeically under load, and the tranny gets fried.

Get the extra fluid out -- drain at the filler tube or suck it up somehow, then see what happens. Serious overfilling will cook the tranny pretty fast. Minor overfilling and short distance driving probably won't hurt much.

If the T on the vac modulator still turns, it's probably OK.

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!
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Old 09-01-2003, 09:03 PM
ForcedInduction
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Will 3/4Q over hurt much? What is the best method to get the extra out?
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  #5  
Old 09-01-2003, 09:44 PM
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I don't think it would stay 3-4 quarts over, it would blow out the overflow!

I'd pull the drain plug and drain the tranny pan. Put a quart or two back in (you can recycle it you use a fresh, clean pan), then check and add until you get to the correct level Use care, they fill up fast.

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!
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  #6  
Old 09-01-2003, 10:07 PM
ForcedInduction
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Its over the "full" area by about double the shaded area on the stick with the engine at idle.
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  #7  
Old 09-03-2003, 01:07 AM
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That's about a pint or pint an a half over.

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!
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