driveline vibration
Submitted: Monday, Apr 25, 2005 at 19:45
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Garyjs
HELP NEEDED! Ihave a 96 hilux dual cab 2.8 turbo diesel with a vibration between 2100 and 2700 rpm have checked all the obvious things but are unable to source the problem any ideas would be appreciated. Thanks
Gary.
Reply By: Wetty (W.A) - Monday, Apr 25, 2005 at 21:50
Monday, Apr 25, 2005 at 21:50
G'day Gary
When you say you have checked all the obvious things, I assume you mean universal joints, CV joints, harmonic balancer on the tail shaft, balance weights on the tail shaft, gearbox damper, out of balance wheels and even the harmonic balancer on the motor? If so, yo have me stuffed, my Jackaroo had some work done to the box and the four bolts used to hold the tail shaft to the box all came loose and caused some hell vibrations and noise. . . . . Tightened em up and what'd ya know, no noise.
Hope you manage to find the problem,
Cheers
Andrew
AnswerID:
108140
Follow Up By: Russel & Mary - Monday, Apr 25, 2005 at 22:01
Monday, Apr 25, 2005 at 22:01
Gary, it sounds like your centre bearing. Climb under your bus and with your hand or feet(if you've got it raised a bit) see if you can push the tailshaft up and notice any slack on the centre bearing. I guess you know what we are talking about.
If not that then maybe the splined shaft going to front diff could be worn enough to give vibes.
Hope this helps. Rus
FollowupID:
364957
Reply By: viz - Wednesday, Apr 27, 2005 at 20:23
Wednesday, Apr 27, 2005 at 20:23
Simplest one to
check is the universal joints. What sort of angle are the drive shafts (i.e. have you raised the
suspension)? If greater than 4º accelerative forces in the universals can cause vibrations - also these angles can cause premature wear on the gearbox bearings; if the unversals are worn or stuffed they can cause vibrations regardless of angles.
Take the shaft off (not that hard) and
check the full motion of each universal. Should be smooth without a crunching feeling right through its range, and no laterla movement.
Check also the tail shaft bearings. I have to assume that these problems occur on the tar - therefore the front shaft will not be suspect (not in gear).
Out of phase universal joints can also cause vibration - has at any time the tailshaft been taken off?
Check that front and rear are 45º to each other (some vehicles like my Rangie have the front universals at 22 1/2º from each other)
HTH :)
/viz
AnswerID:
108470
Follow Up By: Garyjs - Thursday, Apr 28, 2005 at 08:29
Thursday, Apr 28, 2005 at 08:29
VIZ have replace centre bearing and checked universal joints all seems ok vehicle is raised 50mm but all the experts say that this should not be a problem might have to remove gearbox and suss out bearings clutch and flywheel any other thoughts on this might help. Thanks Gary.
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365286
Follow Up By: viz - Thursday, Apr 28, 2005 at 11:49
Thursday, Apr 28, 2005 at 11:49
B4 efore you get too drastic - have a look at the phase of the uni joints - if put back together wrong (i.e. 90º) will induce period vibration. Must be 45º from each other. Another trick is to put some weight in the back to settle the
suspension - does the vibration disappear?
The effects of raising the
suspension depend on the wheel base of the vehicle and the length of the driveshaft. A 50 mm rise on a short vehicle/driveshaft can have a greater effect on driveliine vibration than on a long wheelbase/driveshaft.
Form what you are saying it does sound to me like a periodic vibration - though it is not easy to locate the source. Taking the box out is drastic. Where are you located?
/viz
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