BlueStag Posted May 24, 2012 Share Posted May 24, 2012 OK, I MAY have defeated the exhaust leak: cast iron exhaust manifold to down pipe. Finally figured out that the cast iron manifold surface was way not flat. I had to saw off the last original stud and helicoil for it. Got it all back together today and my word,. it is much quieter. Now, I am bothered (well, have long been bothered) by the whirring of the fan hanging on the water pump. It has a centrifugal clutch. It should resist spinning at low rpm. But the whole rig whirs painfully. Question: is the fact that I have no shroud around the fan makes it more noisy? If I was to construct a proper shroud around it, would it be a lot quieter? Remember: this is not a z that this is in, but rather a Triumph Stag. Quote Link to comment Share on other sites More sharing options...
beermanpete Posted May 24, 2012 Share Posted May 24, 2012 If the can clutch is locked up it will make the fan noisy. You should be able to move the fan easily by hand. Quote Link to comment Share on other sites More sharing options...
BlueStag Posted May 24, 2012 Author Share Posted May 24, 2012 If the can clutch is locked up it will make the fan noisy. You should be able to move the fan easily by hand. The clutch is not locked, the fan spins easily by hand. Quote Link to comment Share on other sites More sharing options...
rossman Posted May 24, 2012 Share Posted May 24, 2012 I have the stock clutch fan on my car with a shroud. I don't think the shroud makes much of a difference, noise wise...but I could be wrong. I can hear the fan but it's not what I would call excessive. When I rev the engine with the car sitting still, the fan noise remains fairly constant and is drowned out by the engine/exhaust. Quote Link to comment Share on other sites More sharing options...
Leon Posted May 24, 2012 Share Posted May 24, 2012 (edited) I only hear my fan on initial cold starts (no shroud, stock fan and clutch). It goes away after about 30 seconds of warmup. I did have a locked up fan clutch when I got the 260, it was noisy as hell and noticeably robbed power. Oh those wonderful previous owners... Edited May 24, 2012 by Leon Quote Link to comment Share on other sites More sharing options...
Noddle Posted May 25, 2012 Share Posted May 25, 2012 The clutch is not locked, the fan spins easily by hand. Have you checked this more than once, on my Datsun 240K the clutch fan had locked, so I replaced it, and put the old one in my parts bin ( still had the blades on it ) I was looking some some bits a few months later, pulled the fan out of my parts bin, to get to stuff under it, and noticed that it span freely, Nigel Quote Link to comment Share on other sites More sharing options...
BlueStag Posted May 25, 2012 Author Share Posted May 25, 2012 Have you checked this more than once, on my Datsun 240K the clutch fan had locked, so I replaced it, and put the old one in my parts bin ( still had the blades on it ) I was looking some some bits a few months later, pulled the fan out of my parts bin, to get to stuff under it, and noticed that it span freely, Nigel I've checked it a dozen times. Quote Link to comment Share on other sites More sharing options...
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