vibe/OME/prop issue - Defender Source
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  #1  
Old October 14th, 2015, 11:05 AM
Roverlab
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Trevor Griffiths
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vibe/OME/prop issue

Hi all!
I have a customer's D90 here that came in with a failed rear prop u-joint and an off-center locked- up fan clutch: enough vibrations that I choose not go on a test drive beyond about 100 yards.
Fixed those issues and fitted new OME 761/764 springs and shocks, as well as other items not pertaining to the issue I have.
Has an on-throttle vibe that begins around 40 mph through 70mph. Goes away when off throttle, seems to return less severely on closed throttle. It seems to be less severe when driven as front wheel drive.
I've taken the rear shaft apart to make sure I didn't displace a bearing when installing the new u-joints, and checked the front prop for offset between flanges (45*).
So, I don't know if this issue was there before with the multiple vibration causing issues.
The OME springs are supposed to be mediums, on a car without any heavy accessories, but I'm not sure if I should be considering a geometry issue as a result of the relatively minor increase in height.
Thoughts?
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  #2  
Old October 14th, 2015, 11:12 AM
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Sam
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You might want to take the rear driveshaft to a driveline shop and have it balanced. Eliminate that as a possibility
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  #3  
Old October 14th, 2015, 11:24 AM
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Jeff B
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Quote:
Originally Posted by One Ten View Post
You might want to take the rear driveshaft to a driveline shop and have it balanced. Eliminate that as a possibility
Or swap it out with another 90 from your lot just to test.... isn't that allowed??


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  #4  
Old October 14th, 2015, 11:25 AM
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Chris Davis
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Most haven't had issue with such small lift, but I had slight vibration from front. Swapped the tcase output flange and used DII double Carlon to eliminate. That said, I'd test with rear shaft out and front out and see where vibe is from before anything else.
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  #5  
Old October 14th, 2015, 11:29 AM
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Trevor, I'm chasing the same issue in a 97 NAS with the same spring set up. I'm starting to think it may be due to the slop I have in the case. I need/want to have the rear angles checked before I go throwing parts at it. Something isn't right because with a standard DS I get a growl on deceleration and a fairly new UJ is taking the punishment. With the rear DS out no vibe, btw.
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  #6  
Old October 14th, 2015, 11:34 AM
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John B.
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40 to 70 sounds more like a wheel speed vibration than a driveshaft speed vibration.
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  #7  
Old October 14th, 2015, 11:46 AM
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Trevor Griffiths
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My general thinking is that due to the short length of the front prop, any lift may have a negative effect on the front before the rear.
Jeff, that is an option, but generally I try to avoid borrowing customer's parts: they all look alike and I might forget who's is who's in the heat of the moment!
Chris, this isn't slight!
Clay, this is a 50k mile rover, and the overall condition of the car indicates reasonable maintenance prior to my involvement, and I'd surmise a joint could fail at that kind of mileage, but I wonder if this has anything to do with a "premature" failure....
John, it just doesn't 'feel' like a tire, especially since it lessens so much when off the throttle. I think I just become more aware of it at 40+.
Pulled the front again- went through this already once, but want to confirm my findings-and going for a test drive now.
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  #8  
Old October 14th, 2015, 12:27 PM
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Trevor, is it an auto and is it running standard R&P? If it has say 411's the vibes are going to be more noticeable. The springs I'm running were in my POE with 354's and I had no detectable vibes. When I moved the springs over to and auto with 411's the vibes came alive. I have a DC in the front w/o the vibes are unbearable. Reminder, this is a OME med duty spring set up with a winch and Rockware winch bumper.
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  #9  
Old October 14th, 2015, 12:38 PM
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Trevor Griffiths
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Stock 97.
So here's an update: Test drive w/o front prop, cdl engaged, vibe still present at 40mph+. Raise on lift, remove front prop, trans in neutral, grab front flange and spin drum (same with cdl engaged), can hear a noise from trans/torque convertor that sounds like a marble rolling around.
Start engine, apply driveshaft brake, put in Drive and slowly release, can hear a rhythmic clicking noise from bell housing. run up to 40 mph- no props installed- begin to feel vibe, worse at t-case. Gentle on/off throttle and can hear a noise at rear of trans/front of t-case that sounds like a bushing/bearing moving. And, the oscillation of the vibe shows up as a blip in the speedometer reading.
So, it ain't the lift.
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  #10  
Old October 14th, 2015, 12:56 PM
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Dan Prasada-Rao
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Well, sounds like you may have found the source but it doesn't sound like it's going to be an easy fix.
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  #11  
Old October 14th, 2015, 05:04 PM
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Trevor Griffiths
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My post should have said 'remove rear prop'- I had it running on the lift with no props, just engine, transmission, transfer case. Front pulley spins true, lay your hand on the tcase and you can feel the oscillations.....
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