1999 Volvo Penta "WT" Models Workshop Manual, Page 85Get this manual
Regardless of what type of equipment is used, however, it is essential that valve guides be free from carbon or dirt to ensure proper centering of pilot in the guidea.lnstall expanding pilot in the valve guide bore and expand pilot by tightening nut on top of pilotbPlace roughing stone or forming stone over pilot and just clean up the valve seatUse 46 stone for both the inlet and exhaust valve seatscRemove roughing stone or forming stone from pilot, install finishing stone on pilot and cut just enough metal from the seat to provide smooth finishdNarrow down the valve seats to the proper width for the intake and exhaustSee Engine Specifications INote This operation is done by grinding the port side with 30
stone to lower seat and 60 stone to raise seateRemove expanding pilot and clean cylinder head carefully to remove all chips and grindings from above operations