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Offline clover

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bearings
« on: January 27, 2010, 13:03:07 »
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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1996 Discovery 300TDi Affectionately known as Clover. 
Cooper Discover STT 33/12.50/R15, a 2" body lift off chassis. H/D springs with 50mm platform spacers on the rear. Nothing on the front as they foul the shocks :-) 11" travel rough country shocks and mountings with dislocating spring cones,  adjusted wheel arches, safari snorkel. H/D rear bumper, demountable drop plate,. H/D steering guard, QT diff guards.
tree sliders, Split charge running twin Optima's, spotlight bar with 4 whoppers on it, H/D winch bumper, 12,000lbs winch,  A bar with 2 50w mini spotlights, brownchurch full length roof rack. 2 work lights.CB,
Fine English engineering modified to work!

Offline clover

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Re: bearings
« Reply #1 on: January 27, 2010, 16:56:47 »
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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1996 Discovery 300TDi Affectionately known as Clover. 
Cooper Discover STT 33/12.50/R15, a 2" body lift off chassis. H/D springs with 50mm platform spacers on the rear. Nothing on the front as they foul the shocks :-) 11" travel rough country shocks and mountings with dislocating spring cones,  adjusted wheel arches, safari snorkel. H/D rear bumper, demountable drop plate,. H/D steering guard, QT diff guards.
tree sliders, Split charge running twin Optima's, spotlight bar with 4 whoppers on it, H/D winch bumper, 12,000lbs winch,  A bar with 2 50w mini spotlights, brownchurch full length roof rack. 2 work lights.CB,
Fine English engineering modified to work!

Offline bogie

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Re: bearings
« Reply #2 on: January 27, 2010, 19:55:06 »
My mate had that problem,he sprayed with wd40 and it went?
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1968 SERIES 2A ,200TDI TUNED,RANGE ROVER AXLES,ONE TON SHACKLES,CPC PARAS,ES3000,POLYBUSHED,ANACONDAS.                     1970 SERIES 2A, 200TDI TUNED,5 SPEED LT77 WITH LT230S TRANSFER BOX 1.211 RATIO.ZEUS DISKS ALLROUND.ES3000,MODIFIED 90 TANK,3.5 DIFFS.

Offline Range Rover Blues

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Re: bearings
« Reply #3 on: January 28, 2010, 19:28:50 »
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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Offline muddyjames

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Re: bearings
« Reply #4 on: January 31, 2010, 17:28:38 »
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.
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1995 300tdi auto ES Disco. Big Green Giant

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