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#1
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4 Speed tapping when in gear and in motion
Howdy-
I recently purchased a 1979 European market 300D with the 4-speed and 56,000 on the clock, and am working on getting it back on the road. Recently, I began hearing a tapping noise coming from under the car while in gear and in motion. The noise is definitely speed related, and stops if I take the car out of gear or put the clutch in while coasting. The noise never arises if the car is stopped, so it must be drivetrain... somewhere. I can't feel any vibration, it's just noise so far. My initial thoughts are the driveshaft bearing and support bushing, or maybe one of the rear axles. Parts are showing up over the next few days to do all the fluid changes. Is there anything else I should be considering? The transmission feels and shifts flawless, and I find it hard to believe there would be an issue with it in light of the low miles. Of course, everything rubber is suspect. Thanks for your time. |
#2
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If the noise stops when you put it in neutral or put the clutch in, it isn't the driveline. If it were the driveshaft or the CV's, you'd still be getting the same noise at the same speed, regardless of gear or clutch position.
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#3
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I had similar symptoms just this week with my 300TDT with a 4 speed out of a 240D (460K miles). I thought of all the same things as you did with the driveline ect. Turns out the transmission gave out completely. I think the ticking was broken parts in the gear box. When I drained trany oil, there were some pretty big chunks. Now I am on the market for a used 4 speed. It is a first for me, seeing a manual fail like this. kinda strange. I wish you the best.
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1980 300TD with 1985 300TD Turbo motor and 240D 4 speed. |
#4
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What is meant by gave out completely Gordo? ...could you give more info please?
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#5
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hopefully its a cracked clutch fork,or throw out bearing.I have had trouble with input and output shaft bearings in manual trans do to lube places using ATF in a trans designed for 80 90 w.
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1999 w140, quit voting to old, and to old to fight, a god damned veteran |
#6
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4Sp
I've got a 4 Speed sitting in my garage, make me an offer.
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#7
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Quote:
It started with a faint ticking from the transmission area when the car was moving. I noticed that the frequency of the ticking corresponded to the speed of the input shaft. (faster in lower gears) less then 50 miles later the problem suddenly got much worse. Lots of binding with cracking and grinding noise when the car is moving at all in either direction and in any gear. The car could hardly move at all under its own power. (just a few feet) When I drained the fluid from the transmission there were some chunks of metal almost too big to fit through the drain plug hole that came out with the oil. When I pulled the transmission out of the car, there was 1/4 inch horizontal and end play in the input shaft. I wrote more about this failure in another post "300D Clutch issues"
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1980 300TD with 1985 300TD Turbo motor and 240D 4 speed. |
#8
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Possibly the axle shaft
Quote:
- Peter.
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2021 Chevrolet Spark Formerly... 2000 GMC Sonoma 1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021 2002 Kia Rio. Worst crap on four wheels 1981 240D 4spd stick. 389000 miles. 1984 123 200 1979 116 280S 1972 Cadillac Sedan DeVille 1971 108 280S |
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