Outrage Posted September 22, 2005 Share Posted September 22, 2005 Hi all, Ive been trying to trace a wirring noise down on the front of my truck and have narrowed it down to either the water pump or alternator on my 2.5 NAD. Ive run the engine briefly with no fan belt on and the noise has gone away. Looking at the alternator, if i push and pull on the pully left and right should there be any movement of the alternator shaft? mine looks to have about 1-2mm play. Its charging ok but does this mean the bearings on its way out? Quote Link to comment Share on other sites More sharing options...
02GF74 Posted September 22, 2005 Share Posted September 22, 2005 Ive been trying to trace a wirring noise down on the front of my truck and have narrowed it down to either the water pump or alternator on my 2.5 NAD. Ive run the engine briefly with no fan belt on and the noise has gone away. Does fan belt drive both alternator and waterpump? Then it has ruled out one or t'other. Could it be something a simple as a worn or slipping fan belt?? Cheap enough to buy and try a new one and keep old one as spare. Don't know about the shaft fore/aft play but would expect there to be a little bit. If bearing are on their way out, then it would be side to side play? Have you tried wobbling the water pump pulley? Quote Link to comment Share on other sites More sharing options...
Jon White Posted September 22, 2005 Share Posted September 22, 2005 Hi all,Ive been trying to trace a wirring noise down on the front of my truck and have narrowed it down to either the water pump or alternator on my 2.5 NAD. Ive run the engine briefly with no fan belt on and the noise has gone away. Looking at the alternator, if i push and pull on the pully left and right should there be any movement of the alternator shaft? mine looks to have about 1-2mm play. Its charging ok but does this mean the bearings on its way out? Bearings on the alternator are knackered - there shouldnt be any movement. Put a new one on. Jon Quote Link to comment Share on other sites More sharing options...
Diff Posted September 22, 2005 Share Posted September 22, 2005 I agree with Jon, there shouldn't be any sideways movement on the alternator pulley. The bearings are knackered and I suggest you replace the alternator soon, or the bearings may sieze up which will cause the belt to melt/ be thrown off, and then the waterpump won't be turning, then the engine will overheat etc etc. Regards, Diff Quote Link to comment Share on other sites More sharing options...
tim_roberts Posted September 22, 2005 Share Posted September 22, 2005 The bearings will go very quickly. In my case, the alternator seized solid and actually stopped the engine. Those polygroove belts are amazing! Quote Link to comment Share on other sites More sharing options...
Outrage Posted September 22, 2005 Author Share Posted September 22, 2005 Cheers for the replies lads, i'll whip it off and change it, whats the going rate for a new alternator? Quote Link to comment Share on other sites More sharing options...
Bull Bar Cowboy Posted September 22, 2005 Share Posted September 22, 2005 £10 from the scrappie ……….there’s loads that fit ………………..if the mounting is on the wrong ‘hand’ , then undo the case screws and rotate the casing. Ian Quote Link to comment Share on other sites More sharing options...
nas90 Posted September 22, 2005 Share Posted September 22, 2005 If you use a large long handled screwdriver with the flat bit on the alternator, engine running, press your ear against the handle to listen to the bearings. If no noise shift to the water pump. Or did you know this trick? Quote Link to comment Share on other sites More sharing options...
Outrage Posted September 23, 2005 Author Share Posted September 23, 2005 £10 from the scrappie ……….there’s loads that fit ………………..if the mounting is on the wrong ‘hand’ , then undo the case screws and rotate the casing.Ian BBC, thanks for the reply. can you think of any that will definately fit so i can just ask at the scrappy? p.s. whats with all the garbage text? NAS90, good idea although over the noise of my engine u cant hear much! Cheers, Lee Quote Link to comment Share on other sites More sharing options...
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