Intermittent Diff/Bearing noise - Not an easy one to pinpoint

Submitted: Monday, May 24, 2010 at 18:10
ThreadID: 78731 Views:3244 Replies:3 FollowUps:3
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Had a noise appear after our last 4 x 4 trek that I am unable to pinpoint at this time.

I replaced the back brakes as the shoes were worn completely and the drums were U/S - I was hoping this may be the cause - It was not

Seems to happen at random at lower speeds and more likely on a bumpy road or at deceleration. All of a sudden a substantial Bearing/Gear noise like a Bad Cruiser diff starts up and may continue for a short to medium distance. Applying a bit of power does not remove the noise.

I have ruled out the front diff as I have free wheeling hubs an I am not in 4 x 4. I have not ruled out a front bearing but I feel its not likely to be this given the random nature of the noise.

The noise continues even if I throw it out of gear and coast, but stops before I bring the car to a standstill.

I had a good look at the tail shaft and uni's and mid bearing seem fine.

So what is the chance of Random rear bearing or diff noise? In my experience they usually carry on and not stop before you can pinpoint the direction of the noise.

I like to try to diagnose before delivering to a mechanic, but this time I may have to pay to find this one :-)

Cheers Tony

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Reply By: steve21 - Monday, May 24, 2010 at 19:07

Monday, May 24, 2010 at 19:07
hi there i had similar thing in my 80 series - was quite loud grindy noise, i had my bearings and cv's repacked and all good now...
cheers Steve
AnswerID: 417974

Follow Up By: Tonyfish#58 - Monday, May 24, 2010 at 20:00

Monday, May 24, 2010 at 20:00
Thanks Steve - CV's are not turning - may be hub bearings, wheel is slightly loose.

Cheers Tony
FollowupID: 688041

Reply By: kiwicol - Monday, May 24, 2010 at 19:49

Monday, May 24, 2010 at 19:49
Front wheel bearing will do that, happened to me, same as you didnt think a bearing would be intermitant, new bearing no more noises.

AnswerID: 417982

Follow Up By: Tonyfish#58 - Monday, May 24, 2010 at 20:02

Monday, May 24, 2010 at 20:02
Thanks Col - Have it booked tomorrow, first thing to look at is drivers side bearing. I have had them make a noise when turning one direction and then stop when you straighten, never had them start up when driving in a straight line.

Hopefully it would be that easy - will post when I find out - Cheers
FollowupID: 688042

Follow Up By: Member - Tezza Qld - Monday, May 24, 2010 at 20:10

Monday, May 24, 2010 at 20:10

Had the same sort of noise that turned out to be loose bolts on the rear crownwheel. Very hard to determin .Had 4 sheerd bolts when I pulled it apart in Bamaga.
Hope your problem is minor

Cheers Teza
FollowupID: 688043

Reply By: Tonyfish#58 - Tuesday, May 25, 2010 at 16:36

Tuesday, May 25, 2010 at 16:36
Seems the issue was the front Right wheel - The Manual Hub bolts were not tightened good enough last service. Also wheel bearings were loose - This combined with a bit of Water getting in may be the source of the noise. The loose hubs may have been engaging and disengaging at a whim?

One can only hope this is all iis, so far no repeat of the noise :-)

Very strange to be so loud

AnswerID: 418075

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