Accel/decel driveline vibration... - Defender Source
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  #1  
Old September 22nd, 2014, 09:53 PM
doktorno
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Chris deZ.
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Accel/decel driveline vibration...

Hello, new to the forum. Threw a bid in on a '95 NAS SW that was up on ebay a few weeks ago and much to my surprise won the auction. Have not owned a Rover since 1996 when my '89 RR was totaled in an accident.

Now that D90 is in my garage I have been sorting through a few minor issues (like a missing condenser fan) and some driveline noise issues. Vehicle is stock with the exception of a 2" OME lift springs and shocks. Seems like more than 2" as the thing will not fit in my garage, but I have the part numbers off the Rovers North receipt.

Under acceleration and deceleration I get a vibration with a frequency that leads me to believe it is a driveshaft problem.
I thought that the driveshafts were suspect so I removed them and had them serviced by a reputable driveshaft shop here in Houston. They found them in good shape, just balanced the driveshafts and found the rest ok. Put them back on and vibrating just as before.

I also get a brief crunching sound that might be slack in the drivetrain...

Also have some mild hesitation at particular throttle settings.

Any suggestions would be appreciated.
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  #2  
Old September 22nd, 2014, 09:58 PM
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Jason England
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Mild hesitation may be a worn throttle position sensor if ( and only if ) it occurs at exactly the same point every time.
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  #3  
Old September 22nd, 2014, 10:08 PM
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Joshua
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Let's see some Alpine white pics!
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  #4  
Old September 22nd, 2014, 10:20 PM
doktorno
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Chris deZ.
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Quote:
Originally Posted by leastonce View Post
Mild hesitation may be a worn throttle position sensor if ( and only if ) it occurs at exactly the same point every time.
Same place every time. Will see if there is a way to test the TPS in the manual. Or clean it?
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Old September 22nd, 2014, 10:23 PM
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Pinion angle, rear links should help solve your little problem . Which number is yours? glad you're back in a rover
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Old September 22nd, 2014, 10:23 PM
doktorno
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Chris deZ.
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Quote:
Originally Posted by rijosho View Post
Let's see some Alpine white pics!
Rijosho, only one lousy iphone picture now but the ebay ad is still up.

http://www.ebay.com/itm/1995-DEFENDE...p2047675.l2557
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  #7  
Old September 22nd, 2014, 10:50 PM
doktorno
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Chris deZ.
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Quote:
Originally Posted by rover4x4 View Post
Pinion angle, rear links should help solve your little problem . Which number is yours? glad you're back in a rover
Thought the same, changed the bushings in the bottom link at the rear axle and the ones at the frame RNS033. #144.

Glad to be back. Already thinking of selling some of my German crap. Funny after over a decade without a Rover I still had the phone number to Rover's North memorized.

What about that center ball joint at the axle? Think it was part of the leveling device on my Classic?
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  #8  
Old September 22nd, 2014, 10:53 PM
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We need lots of pictures of your truck or it cannot be properly diagnosed.
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  #9  
Old September 23rd, 2014, 03:36 AM
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So they said the UJ's were ok? Interesting.

My next step would be to remove the driveshafts one at a time and see if the vibes are still present.
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  #10  
Old September 23rd, 2014, 07:05 AM
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Also might check your transfer case mounts. I cased a vibe for about two years and finally found it in my tcase mount. Deceleration growl could be a problem with the rear trailing arm length or a rear pinion bearing on its way out. Welcome back to the community.

Clay
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  #11  
Old September 23rd, 2014, 07:24 AM
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Quote:
Originally Posted by 1of40 View Post
Also might check your transfer case mounts. I cased a vibe for about two years and finally found it in my tcase mount. Deceleration growl could be a problem with the rear trailing arm length or a rear pinion bearing on its way out. Welcome back to the community.

Clay
You need adjustable rear links, try Rockware Rovertym etc
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  #12  
Old September 23rd, 2014, 10:45 PM
doktorno
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Chris deZ.
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Checked motor mounts with the pry bar and they were groovy. Will get more pictures manana. Thinking about strapping the action video cam to the underside and taking a drive.

Truthfully, with the twitchy steering that I assume was caused by the lift screwing up the amount of caster, I considered going back to stock springs.
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  #13  
Old September 24th, 2014, 07:30 AM
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Mike
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I would also look to the front drive shaft and replace it with a double cardan shaft. Even with a 2" lift some of the Defenders have suffered from a noise/vibration with the stock shaft.
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  #14  
Old September 24th, 2014, 10:59 PM
doktorno
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Chris deZ.
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Took a few photos.

Tried to post them individually but no luck, so here is the link to a album.

https://www.flickr.com/photos/124610...7647988741401/

Also adjusted the door hinges on the driver's door, as the door was hitting the striker a bit low and one had to slam the crap out of the door. Need to order a few replacement pins for the door card.

Friend has a Napa store and there are no throttle position sensors in their system, or available as a special order. Bummer, could have had it at cost!





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