Cylinder Head Valve Seat Inspection - Toro 1P65F-2 Service Manual

Cylinder Head Cleaning Inspection (continued)

Cylinder Head Valve Seat Inspection

1P65F-2 Service Manual
3429-270 Rev A
1. Spark Plug Threads
2. Valve Seats
3. Intake Port
4. Inspect the cylinder head for warpage using a straight edge and feeler gauge.
Measure and compare to specifications:
Service Limit: 0.002 in.
5. Inspect the intake and exhaust ports mounting surface for warpage.
1. Thoroughly clean the cylinder head to remove carbon deposits.
2. Inspect the valve seats for loose seat, proper valve face contact, and proper
seat width.
Standard: 0.028–0.030 in.
Service Limit: 0.040 in.
3. Repeat the inspection for all valves and seats.
Figure 138
4. Exhaust Port
5. Coolant Fins
Figure 139
Page 7–17 Compression System: Service and Repairs