Thread: Alternator (maybe???) bearing whine

Originally Posted by DANMAL

Pete, i had the exact same problem not long ago, and everyone pointed at the alternator, could of sworn it was too.. driving back from port arlington and suddenly alternator fault came up, quickly pulled over and as i did, the temp started to rise so i quickly shut the car off..
the whole time it was the idler puller directly under the alternator, spat the belt off.. luckily it didnt do any damage anywhere, as it was still on (barely though).
mine is already a steel one, apparently being a thor motor, they changed to steel.. i went to Brit part or something like that in north melbourne, ill get the name for you.. cost me $80 something all up with a new belt... if it were the idler on the other side, its double the price for some unknown reason..
Sam

If you have a steel Idler pulley on the passenger side under the power steering this has a cheap renewable bearing. The one low downunder the alternator, and Tensioner pulley Is Plastic from the factory. A replacement will be steel and are about 40pounds plus shipping from the UK ( about $100.) The Tensioner Idler pulley will be plastic from factory but can be replaced with a steel one for about $35, the bearing in the plastic one cant be changed
If from what you are saying you got a Thor 70mm Right side lower pulley please let us know the supplier and part number as thats cheaper than anywhere I have seen. There must be an interchange part number as its nothing special but I have not found one. I believe anyone who still has a Plastic pulley should consider changing it

Hi

The problem with my left hand idler pulley was that it was running in a slightly eccentric manner, so in the end I replaced them all

As I said in an earlier post the nuline metal replacement tensioner pulleys (the right hand one) are readily available and high quality. My local bearing shop carries them, and probably bursons as well

Steve

Originally Posted by SteveFarmer

Hi

The problem with my left hand idler pulley was that it was running in a slightly eccentric manner, so in the end I replaced them all

As I said in an earlier post the nuline metal replacement tensioner pulleys (the right hand one) are readily available and high quality. My local bearing shop carries them, and probably bursons as well

Steve

There are many threads about the tensioner and left side idler with part numbers and bearing numbers. The 70mm Idler under the Alternator, not the tensioner Idler has not been identified with an after-market number. If you have one please advise. This pulley is plastic and the surface wears away until it becomes so thin it will distort or worse detonate as others have found. They also get noisy, not the bearing just the belt running over it. New ones are steel part number PQR500060

Hi

It can get confusing, this is what I replaced on my 99 Motronic

Idler Pulley PQR101150
Idler Pulley PQR500060
Tensioner Pulley Nuline EP027

and for reference since I was going to go this way until I saw how bad the pulley was;

bearings (1 x 6203 and 2 x 6304) the "C3" designation

I can't remember which bearing goes with which pulley though

Steve

Well truth be told I've been a little slack as I haven't driven much.... But this definitely looks like a must check this weekend before I do many km's.. Could get kinda serious whatever bearing it is I guess.

Thanks all for your comments. I'm sure I'll probably report back with either a result or questions this weekend.

Originally Posted by SteveFarmer

Hi

It can get confusing, this is what I replaced on my 99 Motronic

Idler Pulley PQR101150
Idler Pulley PQR500060
Tensioner Pulley Nuline EP027

and for reference since I was going to go this way until I saw how bad the pulley was;

bearings (1 x 6203 and 2 x 6304) the "C3" designation

I can't remember which bearing goes with which pulley though

Steve

I am getting confused.. The PQR101150 80mm is on passenger side Bearing 6304, PQR500060 70mm on drivers side ,Bearing 6203 if you have already got steel pulley. Tensioner pulley is identical to Nuline part epo27.
Dont forget the A/C compressor clutch bearing ..30BD5222
Discovery Series II 1998-2004 / Engine / V8 Petrol - EFi / Drive Belt - With ACE

I just hit on a cheap source of the 70mm Idler Pulley PQR500060 Steel. lrseries.com in the UK 13.58 pounds inc shipping to Oz. About A$26. Just ordered one as the new car has the plastic one.

P/N Product Condition Quantity Unit Price (£) Line Total (£)
PQR500060 IDLER - TIMING BELT Brand New (Replacement) 1 8.59 8.59

Subtotal: 8.59
Royal Mail Airmail: 4.99
Total: 13.58
Total VAT: 0.00

Grand Total: £13.58

wayneg, ill get the number for you tomorrow, sorry iv busted my phone so cant really access aulro on the go for a couple weeks till get my phone back (if its not the p38, its the phone hahaha.. but ill post details tomorrow night.
Sam..