The 928 Timing Belt and Tensioner System is a critical subsystem that drives the camshafts, water pump, and oil pump.
Timing Belt Replacement Interval
The factory-recommended replacement interval for the timing belt is 60,000 miles, but more conservative owners often observe shorter intervals, such as 40,000 miles.
A toothed belt tension warning system was added in MY 1985, which can give early warning of belt problems.
Accessing the Timing Belt
Replacing the timing belt is within the capabilities of a competent DIY owner, but access to the shop manuals and some special tools are required.
The typical shop cost for timing belt and water pump replacement runs from $500 to $1,000, while the DIY cost should run from $250 to $300.
Timing Belt Tensioner
The tensioner adjusts automatically for temperature and hydraulically dampens belt vibrations and fluctuations.
The tensioner should be rebuilt every time the timing belt is replaced, and notes or photos should be taken during disassembly of the tensioner arm.
Manual:
Download: The 928 Timing Belt and Tensioner System: Wally Plumley 928 Specialists
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