406 110 hdi engine squeal

[selectcase]

My wifes hdi engine has started to make a squealing/scraping noise like a bearing on the way out but its hard to pinpoint - it only happens once the car has started up and driven about 3 miles so when the engine is warm then about every 15 seconds it will make this squeal noize for about 5 seconds - i thought it might be the auxillary belt tensioner pully but the sound seems to me more at the top of the engine in the cam cover - could it be a noisy cambelt bearing? i see from the records the belt and bearings were changed about 20k ago and when we boughttt he car last year the dealer popped a new belt on to be sure - it does not sound like other bearings that ahve gone on our other 306 before either?

also any tips on how to pop off the auxillay belt as space loks tight - the haynees suggests removing the exu and box and jacking up and removing the wheel and inner cover - i was wandering if it was necessary as my first idea is to take off the auxillary belt and see chek the tensioner belt bearing just in case as i know engine noises can travel about and give the wrong impression of where the problem is

cheers
will

[lozz]

Only one way to find out ,

Take Aux belt off,
and start the car up, dont run it long with the belt off tho, (battery L go flat,)

Squeal gone,
then check each pulley feel for any play,Roughness,


Pulleys fine,

then check the Freewheeling clutch on the Air compressor,

Noise still there with aux belt off,
Cambelt tensioner/ pulley or bearing in water pump,

to release tension on the aux/belt tensioner,
Move Ecu out the way, no need to disconect it,
there is a bolt on it, carnt rember what size spanner, take off the tension with spanner
and lock tensioner in position with a something small /thin drill bit /nail etc,

if you need more info pictures on the tensioners give us a shout and il put some up,

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If you want too cut corners,
Start car up and Squirt some Fairy liquid on the Aux belt,
Squeal gone, New Aux belt time

[selectcase]

ok thanks i will give it a go today

[martint]

Wouldnt be surprised if its the auto tensioer gubbed

[selectcase]

I took off the aux belt and the noise was still there with the engine running so i used a snap-on stethoscope bought a few years ago and the noise is definatly behind the cam cover so its going to my local garage for a cambelt, pully, and water pump change probobly as i expect one of them is worn - the dealer who sold me the car last year(not my trusty local garage) said he would do the cambelt but i expect/suspect he did a minimal job going by the other repairs on the car like the bodged welded exhaust i had to replace a few months back

[selectcase]

took it to the garage and the water pump was really shot so pump all belts, pully etc now done and its fine cheers

[mjb]

took it to the garage and the water pump was really shot so pump all belts, pully etc now done and its fine cheers

That's brilliant news - the belt change was well worth the money considering the cost of what would have happened if you'd left it!