peter deer Posted October 16, 2006 Share Posted October 16, 2006 Hi I would appreciate your input on this noise which drives me mad idle speed :no noise whatsoever when acceleraring ,noise appears and frequence is clearly related to rpm decceleration ,noise again ,and again frequency related to rpm The noise definitely comes from the top right corner -or maybe center right I have checked belt:noise does not come from there i have changed the water pump ,as I thought it was faulty :no effect,and I know have a good spare pump!! Checked axle and bearings of bbelt tensioner,alterantor and steering pump :they look ok ,turn freely with no hard point .No immediately visible defect I do not see that the belt is rubbing against anything I do not think this is a problem with the cam belt :the noise does not come from that direction Have you ever come accross such a noise ? your adviose would be appreciated Peter Quote Link to comment Share on other sites More sharing options...
peter deer Posted October 16, 2006 Author Share Posted October 16, 2006 I should have mentionned :300 tdi it is ! Peter Quote Link to comment Share on other sites More sharing options...
Andy Posted October 16, 2006 Share Posted October 16, 2006 the noise is from the top right hand corner of what? i thought engine but you wouldnt be able to tell when acclerating (not with a fancy harness or a good grip) Quote Link to comment Share on other sites More sharing options...
headhunter Posted October 16, 2006 Share Posted October 16, 2006 I find placing the seatbelt across the wife's mouth usually works John Quote Link to comment Share on other sites More sharing options...
peter deer Posted October 16, 2006 Author Share Posted October 16, 2006 the noise is from the top right hand corner of what?i thought engine but you wouldnt be able to tell when acclerating (not with a fancy harness or a good grip) i Should have said :top right hand corner of the engine (when looking into the engine bay) Quote Link to comment Share on other sites More sharing options...
imspanners Posted October 16, 2006 Share Posted October 16, 2006 Possibly Alternator belt tensioner bearings? From cold, try a quick test run without the alternator belt on (not for long though as you'll have no water pump). Quote Link to comment Share on other sites More sharing options...
Andy Posted October 16, 2006 Share Posted October 16, 2006 ahh so by acclerating you mean reving, i assumed driving. cant think whats top right on the 300, being a 200 owner. id go for bearings etc, i seem to remember something posted on other forums in the past about the serpentine belt tensioner wearing so it runs 'off-square' to the belt & making bearing noises. from memory the fix was making a wedge to fit behind it to push it back inline. Quote Link to comment Share on other sites More sharing options...
Ivan Posted October 17, 2006 Share Posted October 17, 2006 Doesn't the turbo live in the top right hand corner (if you are looking into the engine from the front of the vehicle) ? Leaky hose or poor connection in the turbo piping perhaps ? Ivan Quote Link to comment Share on other sites More sharing options...
Countax Posted October 17, 2006 Share Posted October 17, 2006 Doesn't the turbo live in the top right hand corner (if you are looking into the engine from the front of the vehicle) ? Leaky hose or poor connection in the turbo piping perhaps ?Ivan The quick test for serpetine belt alignment is a quick spray of water on the belt. If it stops squealing then its out of alignment. If so then let me know and i will send you the info on the 9 o'clock shim fix to the tensioner. Nigel Quote Link to comment Share on other sites More sharing options...
BogMonster Posted October 17, 2006 Share Posted October 17, 2006 Alternator bearings also make a noise like this when they are on the way out Quote Link to comment Share on other sites More sharing options...
muddyplugger Posted October 18, 2006 Share Posted October 18, 2006 Quick squirt of WD40/3-in-1 in the bearing/rear of the belt tensioner will be a diagnositic clue. I thought every 300Tdi had this high pitched churp? Quote Link to comment Share on other sites More sharing options...
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