How often does a 993 typically need a top end rebuild?
06-21-2012, 10:03 PM
#31
Three Wheelin'
Chris, if I understand correctly, a leakdown test will not necessarily reveal worn valve guides.
As to oil consumption cited by several RLers above, my 95 that puked its valve guides at 40k burnt a quart every 300 miles while driven in the City -- real city driving. But on long trips to L.A. and back, it did not burn a measurable amount. Point being, not burning oil doesn't mean your guides aren't toasted. It simply means there may not be a need to do anything about it.
So, OP, if the car you're looking at hasn't had its guides done, they probably are worn. But that doesn't necessarily mean they need to be replaced immediately or that you'll burn too much oil, whatever "not too much" is (and depending on how the car is used, in part). But it may be wise to budget a top end to be done the next time the car needs a clutch....
As to oil consumption cited by several RLers above, my 95 that puked its valve guides at 40k burnt a quart every 300 miles while driven in the City -- real city driving. But on long trips to L.A. and back, it did not burn a measurable amount. Point being, not burning oil doesn't mean your guides aren't toasted. It simply means there may not be a need to do anything about it.
So, OP, if the car you're looking at hasn't had its guides done, they probably are worn. But that doesn't necessarily mean they need to be replaced immediately or that you'll burn too much oil, whatever "not too much" is (and depending on how the car is used, in part). But it may be wise to budget a top end to be done the next time the car needs a clutch....
06-21-2012, 10:20 PM
#32
As to oil consumption cited by several RLers above, my 95 that puked its valve guides at 40k burnt a quart every 300 miles while driven in the City -- real city driving. But on long trips to L.A. and back, it did not burn a measurable amount. Point being, not burning oil doesn't mean your guides aren't toasted. It simply means there may not be a need to do anything about it.
Also, different brands of oil can vary in 'burn rate' by 50% (or more.)
I've seen both cases with my own car.
