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Old 01-12-08, 12:48 PM   #580 (permalink)
88tlc
Forum Regular

 
Join Date: Oct 2006
Location: park city UT and Heber City UT
Posts: 78
4bd1t engine vibration

thanks for all the replies.

The engine vibrates at idle to like 1500rpm, I am working to get the tach in to check the rpms. I think the idle rpms are low, and could suggest incorrect IP timing.

at power and cruising down the road the vibration is the least noticed.

cruising it can vibrate, kind of coasting.

Dougal - there are in fact two pins 180 degrees from each other. I left them both in the flywheel. I also twisted off a bolt in the flywheel at the clutch attachment, but also added another bolt stud, cut off and a slot to screw it in 180 degrees. so I think the flywheel is balanced. at rpm I would expect a flywheel issue to get worse.

I also agree that the mounts should be in shear, and should do a better job of isolating. trans mount is original fj62 mount.

rhino - I agree with you about the IP, I have not yet checked the IP timing. I have it correct relative to the gear, and cam, but can check that #1 fuel is injected at 13 degrees b4 TDC. It can be 2 or 3 degrees off and make a big difference. You can micro adjust then by loosening the IP mounting bolts and rotate to correct timing. I assumed this was correct, but I now want to check it.


Andre, I dont think the driveline is the issue. it vibrates at idle, or not in gear.
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