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Discussion Starter #1
Hi folks. Over the past two mornings my cars made a loud squealing noise when first trying to start then died,on second attempt it starts up fine. Also recently whilst driving there has been a lot of white smoke produced from the exhaust.....I thought this was due to the colder weather but am now suspecting my timing belt is on the way out. I'm now crapping myself about driving it incase it snaps so have left it sitting. Would I be right in my conclusion? Had a look but the timing cover is on and I'm dying with the flu so don't wanna be out in the cold for too long. Any help is much appreciated.

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What motor? Any idea when timing belt was last replaced?

I would first check the auxiliary belts for tightness and also check that all pulleys (water pump/alternator/a/c)/idlers/tensioners were turning freely. Squealing is normally caused by a V or serpentine belt slipping because of being loose or having one of the driven units seizing up. Remove the belt/s and test each pulley for rotation and sideways/rocking movement.

If you briefly run the car without the auxiliary belts in place and the squealing is not there, you have likely found your issue.

Checking a timing belt is a vastly more complicated process on most cars.
 

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hi...many cars produce steam from the exhaust in cold damp weather...and the damp weather we have had is probably making the aux belt slip because the alternator is under load from the starting procedure..timing belts are changed by age/mileage or mechanical failure.....so history is important...good luck...merry xmas:thumb:
 

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Discussion Starter #4
It's a 2006 407Hdi with 174k on it. Only got it last year so not to sure of the belts history. It has done this before on some mornings a wile back(that starting then immediately dying) this new squeal has only started tho and is making me nervous of driving it incase of 'snap'.

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Hi....sorry to say it needs looking/listening at a.s.a.p.difficult to diagnose blind....let us know how you get on tho,so many enquiries go with out updates...
 

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As above, check urgently!

If you remove aux belts, start engine and no noise, :), if noise still there..:eek: PANIC!

Timing belts will not normally squeal if loose as they are toothed. Squealing from the timing belt setup will normally indicate a tensioner pulley has seized, so the smooth outer surface of the timing belt will be squealing on the seized tensioner. If a tensioner partially collapses, it could allow the belt to rub against the cover, but this will normally be a grinding sort of noise, not a squeal.
 

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I have a fair amount of experience with dw8 having rebuilt 2 recently from cam belt failures, both of these guys water pumps were shot both screamed. Also consider drive belt belt. Not sure if faulty cambelt would squeel dont take gamble either way.. unfortunately if its the water pump it costs 20 quid, unfortunately to replace you have to remove cambelt.. need doing at the same time..
 
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