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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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'85 white 300SD - "YCAGWYW" as in: "You Can't Awlays Get What You Want." '85 gold 300D - "Pain"..for sale, as in..Anyone want to date my Ex-wife... I'll Pay !! '83 300td - "Tumblin" as in "Dice" '81 black 300TD Fenix, risen and sold, now residing in NJ |
#2
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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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Jeff M. Mercedes W123 DIY pages are now located here. 1983 / 1984 300D Sold 2000 CLK430 Cabriolet ~58k Sold 2005 Avalanche 4x4 ~66k Last edited by BoostnBenz; 08-31-2003 at 03:31 PM. |
#3
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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! |
#4
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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
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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
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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! |
#6
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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
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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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