|
Why do the 944 timing belts break more often than other examples?
I think it's the water pump. The belt is bent backwards to friction drive the water pump. This dictates that the belt has to be fairly high tensioned compared to other examples where the belt is not bent backwards.
Also there is a tendency to over tension the belt when installed because the mechanic doesn't have the tool. Note that the newer water pumps come with a fence to keep the belt teeth from hitting because of possible slapping -- a loose belt.
Combine these stresses and you have the belting fracture and a broken belt.
I don't deny that the idler/tension pulleys, these are the toothed ones that have the eccentric for adjusting, may bind and cause belt breakage. I've never seen one frozen in the last 19 years. I've replaced a couple that had very worn bearings. Note these are NOT the smooth surface rollers that almost touch the belts.
__________________
Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
New Users please add your car's year and model to your signature line!
Never break more than you fix!
|