Reiny Posted June 15, 2009 Share Posted June 15, 2009 I think my fan idler bearing is toast. I've been hearing a slight hiss from the front part of the engine for a while. At first I blamed the alternator bearings and had them replaced last week, however the hiss persists. I spun the fan (with the belt removed) and heard nothing but there's an ever so slight movement in the pulley when the fan is rocked up and down (without the belt of course). I know that the bearing is murder to replace. Does a post in the tech archive cover the job? Quote Link to comment Share on other sites More sharing options...
Les Henson Posted June 15, 2009 Share Posted June 15, 2009 Hissing noise on a 300TDi with the engine running is usually the tensioner bearing. The fan idler can have loads of play in it and still run quietly. Les. Quote Link to comment Share on other sites More sharing options...
Reiny Posted June 15, 2009 Author Share Posted June 15, 2009 Thanks Les. Tensioner is a brand new Dayco item (three months old). Are they known to hiss after a relatively short time? I'll change the tensioner bearing (10 minute jobby) and see if there's any difference. Quote Link to comment Share on other sites More sharing options...
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