Any Thoughts

Submitted: Thursday, Feb 20, 2014 at 18:17

ThreadID: 106340 Views:1734 Replies:4 FollowUps:13

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dean r2

Hi

I own a 2004 exceed 3.2 diesel.
The problem is a bad grinding noise coming from the rear end, i first thought it was the brakes but have had them checked and its not that, the noise only occurs first drive of the day and only when accelerating. Just today I went to my local mechanic and he put my car on the hoist with the wheels free I started the car put it in drive and no noise while idoling but as soon as I just touch the accelerator the noise starts and the mechanic said he could see the rear wheels were a bit jerky but was unsure as to what the problem could be.
Any idea or help would be great.

Cheers

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Reply By: Michaeljp - Thursday, Feb 20, 2014 at 19:43

Thursday, Feb 20, 2014 at 19:43

does the noise sound like its coming from the wheel area or diff? Does it have a llive axle or independent rear end?

AnswerID: 526898

Follow Up By: dean r2 - Thursday, Feb 20, 2014 at 19:45

Thursday, Feb 20, 2014 at 19:45

coming from the wheel area and is a independent rear end

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Follow Up By: Michaeljp - Thursday, Feb 20, 2014 at 19:45

Thursday, Feb 20, 2014 at 19:45

If its from the wheel area id say wheel bearings, or if diff area id say pinion bearing. Best take it to a transmission/diff expert.

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Follow Up By: Michaeljp - Thursday, Feb 20, 2014 at 19:48

Thursday, Feb 20, 2014 at 19:48

Independent rear , it could also be CV joints.

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Follow Up By: tim_c - Friday, Feb 21, 2014 at 15:10

Friday, Feb 21, 2014 at 15:10

CV joints usually make a clunking sound (rather than grinding) when they're suspect or on the way out.

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Reply By: SDG - Thursday, Feb 20, 2014 at 19:49

Thursday, Feb 20, 2014 at 19:49

How are the companion shafts? The NP Pajeros had a habit of popping out. Not sure if they made any noise though. Are yours original or have they been upgraded?

AnswerID: 526899

Follow Up By: dean r2 - Thursday, Feb 20, 2014 at 19:53

Thursday, Feb 20, 2014 at 19:53

not real sure what the companion shafts are and am guessing they are the originals

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Follow Up By: SDG - Thursday, Feb 20, 2014 at 20:46

Thursday, Feb 20, 2014 at 20:46

The companion shafts are the big rod things that go between the dif and the wheel. They make the wheel turn. When they pop out, diff oil is lost. I'm only guessing here, but no diff oil could result in noise. Also result in busted diff eventually.
It is possible to knock them back in with a hammer.
Apparently with this model the cir clip is a tad small. Resulting in them coming out, but usually only if you tow.

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Follow Up By: patsproule - Friday, Feb 21, 2014 at 06:22

Friday, Feb 21, 2014 at 06:22

Not sure that they are the "big rod thing". That would be the drive shaft or half shafts. The companion shaft is a short splined shaft with a large 6 bolt flange that the half shaft CV bolts to. The splined end goes into the diff and it is retained by a circlip. Yep, they pop out but it will be obvious. There will be oil running down the diff and / or the diff will be stuffed if left for too long.

My suggestion is to check CV's, check wheel bearings, check disc pads and check the handbrake linings. Your mechanic should have checked all of those but it doesn't sound like he did?

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Follow Up By: pop2jocem - Friday, Feb 21, 2014 at 10:07

Friday, Feb 21, 2014 at 10:07

I would also be checking if this guy/gal is actually a mechanic as well.

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Follow Up By: dean r2 - Friday, Feb 21, 2014 at 14:26

Friday, Feb 21, 2014 at 14:26

i have not long replaced all the brake pads including the hand brake so its not that

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Reply By: tim_c - Friday, Feb 21, 2014 at 10:32

Friday, Feb 21, 2014 at 10:32

A bit more diagnosis might be useful - is it a constant grinding or does it sound cyclical/rhythmic? If rhythmic, drive slowly and note whether the frequency is every wheel rotation, or more often (would indicate diff pinion).

I'd drain and refill the rear diff, check the old oil for any signs of contamination or metal fragments (noting it's normal to get a bit of metal 'paste' on the magnetic drain plug).

AnswerID: 526935

Follow Up By: dean r2 - Friday, Feb 21, 2014 at 14:32

Friday, Feb 21, 2014 at 14:32

the noise is constant for around the first couple of hundred meters of driving first drive of the day and than is gone

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Reply By: Krooznalong - Friday, Feb 21, 2014 at 14:26

Friday, Feb 21, 2014 at 14:26

My thought is that you need a new mechanic.

AnswerID: 526948

Follow Up By: dean r2 - Friday, Feb 21, 2014 at 14:30

Friday, Feb 21, 2014 at 14:30

I just caught him before he went home am booked in nxt week so he can have a closer look

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Follow Up By: Krooznalong - Friday, Feb 21, 2014 at 14:34

Friday, Feb 21, 2014 at 14:34

OK - however I would have expected him to have some clue and say something along the lines of 'could be X, could be Y, can't be sure until I have a proper look'.
Good luck with it - hope it's not expensive.

FollowupID: 809340