850 Burnt valve

Poor engine oil or running it too long, or perhaps a bad replacement job. Why were they replaced?

Niels

The hydaulic lifters were making a knocking/tapping noise as half of them were prematurely worn - the work was completed under warranty. Very unusual and always serviced at the main dealer. Many thanks Tony

I had a '93 850 with 180,000 miles and have a '95 850 with 117,000 miles and never hand any engine work. I just took it in to the dealer for all scheduled maintenance.

If you didn't buy it new or it was a lease car, it may have missed some oil changes. The other thing that will do it is rough use when new, but since Volvo engines are run in before the car is sold, that is usually not the case.

Thanks for your help. Tony

Why were the lifters and valves worn at 55k ??? Sounds like either a manurfacturing problem or insufficient maintanance??

Tim.

From what I've read, there seems to be a problem on these engines with those that never see high RPM. The valves need to slowly turn, and it seems they don't at low RPM, and a pie shape piece burns out after a while.

thanks for the advice. Kind regards Tony