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Unread 08-04-2013, 11:08 AM   #1
Adam86
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1998 ZJ 
 
Join Date: Dec 2012
Location: Birmingham, England
Posts: 62
Bad front end whine

Getting quite bad now. Front end is whining quite loudly but only when on the throttle. Pretty much silent when off the throttle.

Where should l start?

4.0 & 249 but l think its the front axle. LSD in the rear.

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Unread 08-04-2013, 11:11 AM   #2
DickDickle
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How is your front drive shaft? Check all the joints for play, you could even take it out and go for a ride and if the noise is still there obviously not the problem, there are only 8 8mm bolts that hold it in.
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Unread 08-04-2013, 11:14 AM   #3
zj97ltd
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If it's only when applying power it might be in the diff. I'd wiggle the pinion (input) shaft and see if there's any slop. Usually this is accompanied by a leak because the loose pinion shaft messes up the seal. If it's the carrier bearings you'll have to pull the cover to investigate. Hub bearings are a common failure too but from my experience, they'll make noise at speed regardless of whether you're giving it power or not.
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Unread 08-04-2013, 11:19 AM   #4
Adam86
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I was going to try removing the shaft but then it only does it when im on the throttle. So can't see it making a noise without the shaft anyway.

Just being out to check the shaft and its got no play. Feels solid.
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Unread 08-04-2013, 11:21 AM   #5
Adam86
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From what's being posted im thinking carrier bearings.

When l pull the cover where and what am I looking for?
cheers.
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Unread 08-04-2013, 11:29 AM   #6
zj97ltd
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Grab the ring gear and see if you can wiggle it side to side.
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Unread 08-04-2013, 11:33 AM   #7
Adam86
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What's the ring gear?

Can you tell I've never had an axle apart lol

Thanks for your help.
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Unread 08-04-2013, 11:39 AM   #8
zj97ltd
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Sorry lol. It'll be obvious when you pull the cover off. You'll see the teeth running perpendicular to the ground. Grab hold of it and try wiggling left to right. You may have to do it with the front wheels off the ground and in neutral so that the rest of the drive line isn't bound up keeping it tighter than it may really be. Here's a pic of mine, you can see the large teeth sticking out, that is the ring gear. Inside the cover, you see to the far left and far right the bolt heads? Those are holding in the carrier bearings on each side.
diif1.jpg

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Unread 08-04-2013, 11:52 AM   #9
DickDickle
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Quote:
Originally Posted by Adam86 View Post
I was going to try removing the shaft but then it only does it when im on the throttle. So can't see it making a noise without the shaft anyway.

Just being out to check the shaft and its got no play. Feels solid.
Not true I had a bad front shaft that would make noise on acceleration sounded like a train or a bad up hill climbing roller coaster and would be quiet on deceleration. If you don't find anything in the diff try removing the shaft its not going to waste any time giving it a shot
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Unread 08-04-2013, 12:10 PM   #10
Adam86
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Thanks for the above information guys.

Just being round the block to take a quick vid. You can hear the whine stop when off the power. This was between 15-30 mph.

I assume you guys make make out the whine?


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Unread 08-05-2013, 02:17 AM   #11
shaban
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Try tightening up the pinion first - it helped my whine, was getting noticable at 50+ mph. Read up on setting the pinion preload for the front axle.
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Unread 08-05-2013, 07:51 AM   #12
Snowfan2
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Quote:
Originally Posted by shaban View Post
try tightening up the pinion first - it helped my whine, was getting noticable at 50+ mph. Read up on setting the pinion preload for the front axle.
+1
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Unread 08-05-2013, 08:51 PM   #13
shaban
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And yes, before doing anything else, change the oil. If you have visible damage on the gears or chunks of metal in oil, chances are its too late.
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Unread 08-21-2013, 12:13 PM   #14
Adam86
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Had chance to take a look. Prop is fine and l had no metal in the diff oil. Everything seemed tight enough.

Are these the carrier bearings?

http://www.ebay.co.uk/itm/Dana-30-35...item27c9304923

Cheers
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Unread 08-21-2013, 12:15 PM   #15
DickDickle
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Did you try driving with the front shaft out yet?
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