Hi All,

I have an 87 300D,(124) with a manual tranny, and since I've had the car its always given off a lot of vibration and a din (a low booming, v loud in the cabin), but only at certain mph in certain gears. The common factor seems to be around 1500 1700 rpm, more noticeable in 3rd, 4th and 5th gears and under load.

Have any of you guys experienced a similiar vibration in your Mercs and how did you correct it? At the moment I avoid certain speeds and gears but someday I'll have the time and a spare drivetrain!!

Thanks for your suggestions
Gerard
Ireland

First, I'd check the exhaust is correctly fitted with the right resilient hangers etc and no joints 'strained' to bring it into alignment.

If you don't find the problem I'd go for the engine mountings next.

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Mick J
'08 Chrysler 300CRD (MB OM 642 engine)
'95 E220 estate
'89 230TE (R.I.P.)

Engine mounts are certainly a common problem.

Is your manual trans. 300D a US or Euro car?

Good luck,

totaly off the wall, but your exhaust grows as it gets hot (over 1" on a 123 wagon). be carefull , but check for binding while it is hot.

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g-wagen

It's a Euro Larry, he's in Dublin.....

Thanks Guys

Its a Euro alright!! I replaced the engine mts, in December,made no difference to the noise at all. I probably should have done the g/box mount aswell though.
I'll have a look at the exhaust next.

Gerard

Take a look at the center support bearing as well. It's hidden behind the exhaust shield over the center part of the car, just in front of the universal. As it weakens, it can let the driveshaft whip around when under torque. Was the cause of a similar vibration with mine.

-anthony

Hi Guys,
Checked out the exhaust and that seem ok.
I replaced the gear box mounting and also found a loose vibration damper attached to the propshaft. I reglued the damper back on (I know it was glued badly but a quick fix) and the vibration almost disappeared.
Its now back so I have to get under it with a good adhesive and do a proper job. I think that might be it!!

My engine runs on 5 and a half cylinders, a bearing is gone in the gearbox, and there is a huge amount of play in the final drive bearings, and I am looking at little bits of rubber to sort vibration problems!!



Thanks for all your sugggestions
Gerard

speaking of rubber, are your air filter housing mounts okay. that can cause an annoying resonation(sp), but it sounds like you found the culprit.

cheers

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g-wagen

Gerard,

COMPLETELY off topic BUT....

What temperature do you guys drink Guinness at over there? It's my absolute favorite beer and we always have debates between my friends and I over the proper temp. None of us have been to Ireland so we just drink it pretty cold, like everything else here in the US.

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Regards,
Aaron

Aaron,

I can't speak specifically for Guinness, but while living in Germany many years ago, the heavier beers there taste great at cellar temperature. We, as Americans, called it "warm," but in reality it was probably in the 65 degree range. It doesn't take long to get used to it and prefer it at that temperature.

The problem for me now is that I have no taste whatsoever for American beer. I only drink it when in Europe or somewhere that I can get real beer.

Good subject,

Well its off topic, but I have to answer any queries about such a national phenomenon!
I cant say for sure there is a temperature, I guess it has to be just right, not too hot , not too cold. Too cold and it hurts your teeth when you're taking a big swig of it, too hot and it loses its head and tastes of rotten malt before its finished.
I have just read the Guinness website and they quote 6 degrees C for draught and 3.5 degrees C for Guinnesss extra cold draught.

Gerard

I think that's alot cooler than cellar temperature in Germany.

Happy drinking,