900 L4-1985cc 2.0L SOHC Turbo VIN S FI (1984)
Valve Seat: Service and Repair
16 Valve Non-Turbo & All 8 Valve Engines
Fig. 7 Milling valve seats
Machine valve seats as needed using a 45° milling cutter, Fig. 7. After cutting, use marking dye to check width of each valve seat. Exhaust valve seats
should be reduced from the bottom only, using a 75° cutter, with the contact area extending to the periphery of the valve face and measuring
approximately 0.060 inch. Intake valve seats should be narrowed using a 75° cutter from the bottom and an 11° cutter from the top, to produce a contact
area of approximately 0.060 inch which lies in the middle of the machined valve face.