Mud-club
Vehicle & Technical => Discovery => Topic started by: clover on January 27, 2010, 13:03:07
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Hi
I've got a naughty 300TDI. Its making horrid mechanical noises like a bearing is degrading. I don't have a viscous fan but electric.
It sound like its coming from the front. At first I thought it might be the water pump or the alternator. Get louder with increased revs and no
difference when the steering under load. So I don't think its the PAS pump.
So took fan belt off and sure enough it not making the noise. Its loud enough to hear with the bonnet down and drown out the noise of other
vehicles running next to it!
Replaced the water pump despite not thinking that was the problem but at £20 and a half hours work it would have seemed cheeky not to!
Anyway after further investigation I have found two things. There is wear in the tensioner idle wheel and also in the viscous fan pulley.
I don't think it the tensioner but may best combination of both. I want to change the bearing for the viscous pulley.
So my questions are this - how difficult is it to replace the viscous pulley bearing in the timing belt cover? Do you have to remove the cover
(i.e. am I right in thinking it comes out from the inside? Are they available or do I have to look at buying a second hand cam belt cover?
Also how easy is the bearing in the tensioner to replace or do I just buy a new tensioner wheel?
Sorry have been meaning to buy a 300TDI manual but its low on the list!
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On closer inspection the alternator nose has the most play of the lot at 2-3mm side to side movement. I think that is my problem.
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My mate had that problem,he sprayed with wd40 and it went?
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I don't know how hard the fan bearings are, I bought a spare timing case. The tensioner you can swap, flick out the circlip and push out the bearing, visit a bearing supplier like City Seals and Bearings, buy a repalcement and refit along with the circlip. If you wait 'tillit fails the belt will damage the running surface. Ask me how I know :doh:
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to hear for a going bearing get a long screw driver and put your ear to the handle and the other end on the bearings and the one going will sound different. Sounds daft but I got shown it once and it worked. It turned out to be the air con pulley on mine.