Defender 300TDi chirping noise

[bmt216a]

Hello,

Trying to resolve this noise I'm getting from the front of my engine. I have changed the water pump and belt tensioner bearing and still have the noise. The noise goes when I take the fan belt off. It also tends to go when the car has been running for about half hour.

When I spin the alternator by hand I get a light brushing noise. Dont really get any noise from from the power steering pump. The case bearing seems to be ok.

Any ideas before I spend £90 on an alternator?

Cheers
Ian

[anonymous-user]

Sounds silly and probably bks but have you changed the actual belt too?

[gowmonster]

when you spin the alternator it's not under tension though, could it be the bearings in the alternator? or bearings on any other thing the belt goes via?

[bmt216a]

Belt was changed about 16 months ago. It's hard to tell if the alternator bearing has gone. Can't pin point the sound when I put a screwdriver to my ear. It's either that or power steering pump.

[Sarge 4x4]

Try turning the belt.

[anonymous-user]

bmt216a said:

It's either that or power steering pump.

Unlikely. Power steering pumps tend to be self-lubricating when they start to let go.

[jagracer]

The last 300 I looked at had a drive belt (serpentine), if it's the same, have you checked the tensioner and aircon pulley if it has it.

[P100]

The 300 TDi budgie is a classic ! and can get you all wound up changing everything in sight.

Actually, its the belt tensioner that's making the noise! and change the belt too whilst you are at it.

The noise is caused, not by the belt or the bearing, ( as some think), its wear in the radial spring that allows the pulley wheel to turn away from its axis, causing the pulley to be out of line with the belt causing the chirp !!

Roy

[cpas]

It's not the over-finch model is it?!

[vjj]

very funny

definitely the belt tensioner.