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EDIT: Read post: http://ericthecarguy.com/kunena/8-Service-and-Repair-Questions-Answered-Here/41968-86-volvo-740-turbo-vibration-and-noise-issues?start=70#83381
Greetings all the way from Norway!
I have an issue with my 1986 Volvo 740 Turbo Intercooler that I can’t find any solution to. When driving past 60 km/h the car start to vibrate. I have had my car to a couple of different workshops, but none have managed to get it fixed.
Thought I could mention some technical specs about the car.
Engine – B230ET (134kW, turbocharged)
Injection system – Bosch Motronic ML 1.0
Gearbox – M46 (manual 4-speed + electric activated overdrive)
Rear axle – 1031 (torsen differential)Here is a runthrough of what I’ve done so far:
* Replaced every bushing on the car.
* Replaced engine mounts and gearbox mount.
* Replaced bushing and bearing for the driveshaft.
* Replaced the gearbox with one driven approx. 100.000km
* Replaced the differential and had the rear axle at the Volvo dealer to check for slack. Found well within tolerance.
* New tyres and rebalanced them.
* Changed wheel bearings.
* Changed rubber coupling (hardy coupling) between the gearbox and driveshaft.There have been vibrations since I bought the car 10 months ago. It is a common problem that the bushing for the driveshaft goes bad (which causes vibrations), so I didn’t really see that as a problem. After changing it I also realized that the driveshaft had a loose piece inside it that were impossible to remove. I then bought a used driveshaft. The vibrations were now less intensive, but very noticeble. I then replaced much of the things mentioned above, without any luck. Had it at a workshop to get the issue sorted out, the driveshaft were then replaced again with another used one. Got the car back as “fixed”, but there were still vibrations. Turned out the workshop installed it wrong (splines mismatched the balance markings. I corrected that, now the vibrations are almost gone, but are still there. Doesn’t look like any workshop know how to fix a RWD car anymore. None have equipment to measure angles etc.
Any suggestions on what to do here? This have been bugging me for a long time and won’t give up until it is fixed!
– Frank
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Just another update. Still nothing have happened. Guess I’ll have to nag the engine workshop a bit. Vague answers and have been a while since I’ve heard from them. Hopefully it gets done this summer.
Talked with the workshop earlier this week. The engine workshop have closed down for the summer, and the workshop that will be pulling out the engine of course want to wait until they’re open again. They will also be moving into a new building within a few days time. They estimate that the work on my car can begin sometime next month.
Finally some progress! Contacted a couple of workshops that specialize in engines. The first workshop just said no right away. They didn’t want to touch the engine at all. The second workshop were positive. The guy on the phone actually said “Is it the ET engine? How nice that someone actually want to restore and keep it running!” He knew all about the engine, so I’m sure this is a good place to go. It will be a full overhaul. Of course, labor in Norway isn’t cheap, so it will be very expensive. More than the marked value of the car. I’ve become quite attatched to the car after hours of both swearing and good times. I’m never going to sell this car voluntarily. I expected this, so I have beforehand saved up the required money.
Hopefully this will bring an end to this long journey trying to figure out the cause of the vibrations. Have been both fun and agonizing.
The work is scheduled to begin next week. Hopefully by the end of the month I can give you guys a positive update!
Quick update: The engine is now sent to the workshop. The estimate is a couple of weeks. Hopefully the rebuilt engine and brand new flywheel solves the RPM related noises and vibrations.
Included a picture of the current state of the car:
[URL=http://s1218.photobucket.com/user/frankbilder/media/20141015_154628_zps3700c1b2.jpg.html][IMG]http://i1218.photobucket.com/albums/dd414/frankbilder/20141015_154628_zps3700c1b2.jpg[/IMG][/URL]
Interesting that we’ve come this far. Keep us posted on how the rebuild and installation goes. Good luck and stop back to report your progress.
Have done the break-in of the engine now and all going well. The new flywheel helped a lot, don’t have the vibration when engaging the clutch now. But still have that odd vibration that occur around 1500-2000 RPM. Also still feel some vibration at around 70 km/h (43-ish mph). I suspect the culprit might be the drive-shaft. The tyres are balanced and the rims are round, so that isn’t the problem. The drive-shaft is basically the only thing I have not had checked out professionally. I’ve replaced it 3 times or so, and had vibration worse at the same speed with previous drive-shafts. The problem is that it is too long to have shipped in one piece. Everyone I’ve bought one from have pulled it apart at the middle (it does have splines) without marking the orientation. So I have no clue which position is the correct one, and have 20 possible positions or so… A lot of work to pull it apart trying to find the correct orientation. Would like to have it professionally balanced, but it seems no one does this service anymore in my country. Have to ship it out of the country to balance the drive-shaft. Not sure if I should pull everything apart potentially 20 times or find a company abroad that could balance it. Either way is a big hassle.
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