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  #1  
Old 06-Mar-2006, 10:49 PM
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Cambelt not running true

Hi,
Just replaced the cambelts on my 888 and on turning the engine over manually to make sure the timing marks are aligned, the belts both run towards the back of the tensioner pulley very close to the barrel.

I've checked the tensioner bearings which are ok and the belt runs true on the idler and the toothed pulleys.

I am turning the engine over clutch anticlockwise, which I presume is correct. The only thing that seems odd is that the face (where the back of the belts touch) of the tensioner pulleys is curved slightly as are the idlers.

What am I missing??

Andy
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  #2  
Old 06-Mar-2006, 11:50 PM
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Check the tensioner pulley mounts haven't unscrewed. When you undo the lock nut to rotate the pulley, you can undo the mounting bolt.
Remove the pulley, and check it's tight. Remove and use loctite for peace of mind.
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Old 07-Mar-2006, 09:19 AM
Herb Herb is offline
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Quote:
Originally posted by andya
The only thing that seems odd is that the face (where the back of the belts touch) of the tensioner pulleys is curved slightly as are the idlers.



Andy

This is called crowning, and although I am not particularly familiar with the Ducati belt drive, I can state that crowned pulleys are normal in automotive belt drives. The theory is that the crown centres the belt on back drive pulleys and helps it track correctly. (This theory is taking a pounding at the moment in my industry and we are now using machined flat pulleys.)
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Old 07-Mar-2006, 11:04 AM
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Hi Nelly
The pulley mounts are tight. Are the pulleys supposed to be curved?
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  #5  
Old 07-Mar-2006, 03:54 PM
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Can anyone confirm which way the engine runs, looking at the clutch
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Old 07-Mar-2006, 04:27 PM
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Shove it in gear and turn the rear wheel all will be revealed.
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Old 07-Mar-2006, 05:17 PM
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I would do that if the engine wasnt on my workbench!!!
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Old 07-Mar-2006, 05:47 PM
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Quote:
Originally posted by andya
I would do that if the engine wasnt on my workbench!!!

Um ok,

Take the plugs out, turn the clutch around with engine in gear and watch which way aroung the sprocket turns.
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Old 07-Mar-2006, 08:36 PM
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From the LHS (alternator) the crank turns anti clockwise.
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  #10  
Old 09-Mar-2006, 12:36 AM
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CAM BELTS TURN ANTICLOCKWISE AS YOU LOOK AT ENGINE FROM R/H SIDE AND TENSIONERS MUST BE TURNED ANTICLOCKWISE TOO
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