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post #1 of 30 (permalink) Old 21-12-2016, 17:29 Thread Starter
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Whining sound from engine

I noticed on our last short trip and on recent drives in the van that there is a whining noise coming from the engine which goes up and down as you accelerate and go through the gears. You know like in the olden days an AM radio if it wasnt tuned in would pick up the noise of the revs? Its a bit like that.

Van was in for a service today and they just reckoned it was coming from either the alternator (18 months old), powered steering, or one of the other pumps or belts. They said not to worry about it as it would be expensive to find out what it was and to just wait and see if it manifests itself further.

Its a Peugeot Boxer 2.5td 1996 vintage. Drives fine and gears are fine.

Just thought I would put it out there for a second opinion. On the plus side I got a free service as the garages computer system was playing up so I sorted it while I was waiting.


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post #2 of 30 (permalink) Old 21-12-2016, 17:34
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post #3 of 30 (permalink) Old 21-12-2016, 17:41
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Turbo whistle? Anyway if it gets worse worry about it then.
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post #4 of 30 (permalink) Old 21-12-2016, 17:49
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I take it they did check the vacuum hoses as I had similar occurrence.

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post #5 of 30 (permalink) Old 21-12-2016, 18:02
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I think you'll find the sound originates from the front passenger seat.
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post #6 of 30 (permalink) Old 21-12-2016, 19:57
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Possibly one of the aux belt idler pulley bearings.

Alternator should be good for 100k miles, mine on the Discovery has done 177k and still quiet.

Water pump bearings are another possible.

Peter
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post #7 of 30 (permalink) Old 21-12-2016, 20:45 Thread Starter
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Thanks. Shouldnt be the alternator then as it was replaced last year. I dont think they tried very hard to diagnose it.

It will be fine until im up an Alp or something.


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post #8 of 30 (permalink) Old 21-12-2016, 21:57
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post #9 of 30 (permalink) Old 21-12-2016, 22:48
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Quote:
Originally Posted by listerdiesel View Post
Possibly one of the aux belt idler pulley bearings.

Alternator should be good for 100k miles, mine on the Discovery has done 177k and still quiet.

Water pump bearings are another possible.

Peter
Just a thought on the possible idler pulley bearings, if Barry liberally sprayed WD40 with the fine tube delivery around the centre of the bearings that he can see from both sides if possible, that might show the presence of the source if the spray quietened them down, even if only temporarily? Just working from first principles as to the possible source.

Would that work?

Dave
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post #10 of 30 (permalink) Old 22-12-2016, 08:24
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Quote:
Originally Posted by Penquin View Post
Just a thought on the possible idler pulley bearings, if Barry liberally sprayed WD40 with the fine tube delivery around the centre of the bearings that he can see from both sides if possible, that might show the presence of the source if the spray quietened them down, even if only temporarily? Just working from first principles as to the possible source.

Would that work?

Dave
They are normally deep-groove ball bearings with metal side seals, so you wouldn't get anything inside from outside.

Best way to check all of the driven items is to pull the belt and spin the alternator, idler bearings, water pump and power steering pump if fitted.

If the alternator has a vane vacuum pump for the brakes, that can get noisy, especially if it wasn't renewed with the alternator.

Takes 10 minutes on the Discovery, but there's a fair bit to check. The tensioner pulley is one that needs checking.

Peter
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