944 S L4-2479cc 2.5L DOHC (1987)
Proceed as follows:
The valve guides must always be reamed with "petroleum' lubricant. Withdraw the reamer regularly to remove chips. Then finish-ream the
bore again with a dry reamer.
8.
The valve seat rings must be remachined alter replacing the valve guides. it is not enough to grind in the valves with grinding paste