79 240D weird vibration after an hour of driving - Mercedes-Benz Forum

 
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post #1 of 9 (permalink) Old 07-25-2016, 06:25 PM Thread Starter
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79 240D weird vibration after an hour of driving

Newbie here with a 1979 240D automatic with 300k. Bought in Portland and drove to its new home in Jersey City.

Runs great. Body is excellent. Starts well. No smoke. Gets about 26mpg. I've adjust the valves, fixed seats, replaced brakes. I bought it with lots of new parts, including engine mounts, cooling system, alternator, AC compressor, etc.

Can I pose this odd problem I'm having to the Merc hive mind:

I drove it for about 2 hours one way on the highway, 65-70 mph (not sure if that makes a difference, but getting all the facts in) with no problem. Get to my destination in the small city, drive around a bit pick up a couple friends then turn around and go home. At about an hour and a half into the return trip, again at around 65-70 mph, I get this strange vibration in the front end, feels like the right side. Sounds almost like something flapping in the wind or slapping against something, growing increasingly louder. No power loss, or change in the sound of the engine. Oil, temp gauge fine. Got to my next destination in the city, dropped off my friends, and drove around for about 20 minutes, then back out on the highway for another hour and it's fine.

Next big highway trip was yesterday, with a passenger, and at about hour 2.25, the sound and vibration started up again. Got to my destination, again drove around for an hour or so no vibration or anything, then back on the highway. No problem for about 45 minutes then it starts up again. I pull over, and as I make right turns there's a clunking noise feels like around the right tire. Drive around a bit, get back on the highway, about 45 minutes later the sounds starts up again. I got home this way, pulling over every 45 minutes and then getting back on the highway and getting another 45 minutes or so.

Anyone ever experienced such a thing? Wanted to pose it to the group before I get a mechanic on the job. Hopefully it's something I can do myself.
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post #2 of 9 (permalink) Old 07-25-2016, 06:54 PM
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79 240D weird vibration after an hour of driving

How's your alignment? Tierod end one its last leg and maybe the wheels are going out of alignment? Any clunks when you turn the wheel back and forth when standing still?

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post #3 of 9 (permalink) Old 07-25-2016, 07:13 PM
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Can you check the rear of the tire for bulges or other damage?
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post #4 of 9 (permalink) Old 07-25-2016, 07:36 PM Thread Starter
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Originally Posted by Fonzi View Post
How's your alignment? Tierod end one its last leg and maybe the wheels are going out of alignment? Any clunks when you turn the wheel back and forth when standing still?
Two new tires on the front and trusted mechanic aligned them. What's weird is that it does it only after a couple of hours of driving. And so far only with a passenger in the front seat.
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post #5 of 9 (permalink) Old 07-25-2016, 07:37 PM Thread Starter
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Can you check the rear of the tire for bulges or other damage?
I did find a screw embedded in one of the tires but just left it there. New tire too. GRR
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post #6 of 9 (permalink) Old 07-29-2016, 04:20 PM
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Jack up the right front and try wiggling the wheel and look under to see everything..
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post #7 of 9 (permalink) Old 07-30-2016, 04:20 AM
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I did find a screw embedded in one of the tires but just left it there. New tire too. GRR
I'd take the nail out and repair the puncture (if gone through).

When the tyre gets hot, the pressure may go up enough for the tyre to change shape and hence the screw touch the road?

Just a guess.

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post #8 of 9 (permalink) Old 07-30-2016, 05:20 AM
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I did find a screw embedded in one of the tires but just left it there.
Not wise; fix it immediately. Those types of wounds do not heal themselves.
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post #9 of 9 (permalink) Old 08-04-2016, 03:53 PM
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I'd be more concerned if a 300K-mile 240D did NOT have vibrations. Probably would mean the car had died.

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