When Should I Replace Belts?
12-08-2005 | 09:58 PM
#1
Thread Starter
Instructor
Joined: Aug 2005
Posts: 109
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From: Brisbane Australia
When Should I Replace Belts?
I have recently purchased my 951 and it has done 50,000km, I think thats around 35,000 miles since it had belts fitted 5 years ago. It had a check and adjust 6,000km ago at an official Porsche centre.
Lots of guys here in Australia are telling me to replace them now, do they go longer or shoud I do it?
Lots of guys here in Australia are telling me to replace them now, do they go longer or shoud I do it?
12-08-2005 | 10:02 PM
#2
Pro
Joined: Nov 2004
Posts: 566
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From: Victor New York
Check out Clark's Garage, shop manual, under Maintenance for advice. Very useful site.
http://www.clarks-garage.com/
From that site:
On 944s, the timing belt and balance shaft belt should be changed at 45,000 miles. For 968s, they should be changed at 60,000 miles. For both the 944 and 968, the belt condition and tension should be checked every 15000 miles. The 15,000 mile inspection interval assumes that the car has bee driven on a regular basis. If your timing belt is two years old and you have not reached the 15000 mile inspection interval, the timing belt tension and condition should be checked then and once per year after that.
For 944s it is unusual for a water pump to last significantly past 100000 miles. For that reason, I recommend replacing the water pump at every other belt change (90000 miles). For 968s, it may be possible to extend the life of the pump to the second belt change at 120000 miles. However, you should monitor for indications of a failing water pump closely after 100000 miles.
For timing belt and balance belt tensioners and rollers, I recommend removing the rollers and spinning by hand at each timing belt replacement. If the roller is noisy, it should be replaced. All rollers should be replaced at every other belt change unless it's an individual roller that was replaced during the previous belt change. For pre-1987 model 944s, the timing belt tension roller stud should be replaced at every other belt change.
http://www.clarks-garage.com/
From that site:
On 944s, the timing belt and balance shaft belt should be changed at 45,000 miles. For 968s, they should be changed at 60,000 miles. For both the 944 and 968, the belt condition and tension should be checked every 15000 miles. The 15,000 mile inspection interval assumes that the car has bee driven on a regular basis. If your timing belt is two years old and you have not reached the 15000 mile inspection interval, the timing belt tension and condition should be checked then and once per year after that.
For 944s it is unusual for a water pump to last significantly past 100000 miles. For that reason, I recommend replacing the water pump at every other belt change (90000 miles). For 968s, it may be possible to extend the life of the pump to the second belt change at 120000 miles. However, you should monitor for indications of a failing water pump closely after 100000 miles.
For timing belt and balance belt tensioners and rollers, I recommend removing the rollers and spinning by hand at each timing belt replacement. If the roller is noisy, it should be replaced. All rollers should be replaced at every other belt change unless it's an individual roller that was replaced during the previous belt change. For pre-1987 model 944s, the timing belt tension roller stud should be replaced at every other belt change.
