byrdman454 wrote: ↑Thu Feb 04, 2021 5:33 am
To make things even more scary is that the WP is the original one I put on when he got the car. I can't even tell you the date on it. It was a 928 Specialists rebuild back when companies still sold rebuilt WPs.
Rebuilt from 928 Specialists would be plastic impeller (always.) So, no block damage risk.
For 928s that I see regularly *and* on which I was the last technician to do a full service, I don’t get worried until the job is 10 years old. I worry more about the grease in the sealed bearing for the tension roller than the belt. I check the belt system every two years. Beyond that, I take into account the usage and parking conditions of each 928 I service. Rarely-driven 928s that live in climate-controlled garages can go more than 10 years as long as I get to check the belt system every year. At 12-14 years, though, it’s time no matter what. 928s that see freeze/thaw cycles, 10 years is my limit.
This “controversy” is beaten to death every couple of years. The timing belt is almost never the problem. It’s the stuff the belt touches and the tensioner.
Hanlon’s Razor: Never attribute to malice that which is adequately explained by stupidity.
Heinlein’s Corollary: Never underestimate the power of human stupidity.
Worf’s Razor: Never attribute to stupidity that which is adequately explained by laziness.
Worf's Corollary: Once you've mitigated risk from stupidity and laziness in your endeavors, failure is usually the result of insufficient imagination.
My 928 Inspection Guide