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#1
03-29-2014, 03:11 PM
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Harmoic vibration 78 300D
Does it sound possible that changing the transmission mount on a 78 300D would cause a harmonic vibration? I'm going to look at a car whose owner claims that this occurred after he replaced the transmission mount and that it is worse in colder weather, less noticeable in the heat. He says the rubber of the replacement mount is too hard and if he uses a heat gun on it it softens it up and the problem decreases. Just wondering what the folks on the forum think of this issue?
- 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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#2
03-29-2014, 03:53 PM
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Well Peter, I think there is some truth to what he says. But I think there is a further problem which is either in the front mounts being bad or that the driveline bushing/bearing is bad. I think they are all kind of in it, together.
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Junqueyardjim Christianity, if false, is of no importance, and if true, of infinite importance. The only thing it cannot be is moderately important. C.S. Lewis 1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA 2003 Jaguar Type X, AWD. beautiful, good mileage, Mom's car, but I won't let her drive it!
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#3
03-30-2014, 08:54 PM
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^^ Times 1
I cannot understand why someone would use a heat gun on the transmission mount....replace all the mounts with lemforder/phoenix and then report back...
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#4
03-30-2014, 09:47 PM
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Well. I test drove the car today and unfortunately I don't think I'll be finding out. The vibration was horrific. I mean it could well be that all the mounts and mount shock's just need replacing but the car is almost undriveble as it is. It was so bad it was almost impossible to concentrate on any other aspect of the test drive so I'm afraid I'm going to have to pass on this one.
- Peter.
__________________
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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