Valve Face Contact Test; Valve Guide Inspection; Valve Inspection; Valve Spring - Toro 1P65F-2 Service Manual

Valve Face Contact Test

Valve Guide Inspection

Valve Inspection

Valve Spring

Compression System: Service and Repairs
1. Apply a light coat of Prussian Blue or erasable tipped marker ink to the valve
face.
2. Insert the valve, lift the valve and snap closed against the seat several times.
Note: Be sure the valve does not rotate on the seat.
3. Inspect the transferred making compound for any area of the seat that is
not concentric.
4. Replace the cylinder head if any of the above items are found out of
specification.
1. Measure and compare to specifications:
Inside Diameter (Intake and Exhaust) Standard: 0.2598–0.2604 in.
(6.60–6.615 mm)
Service Limit: 0.2624 in. (6.665 mm)
2. Replace the cylinder head if any of the above items are found to be out of
specification.
1. Clean carbon from the valve.
2. Inspect the valve stem for pitting, wear or bent. Compare to standard:
Intake Standard: 0.216 in. (5.48 mm)
Intake Service Limit: 0.209 in. (5.318 mm)
Exhaust Standard: 0.214 in. (5.44 mm)
Exhaust Service Limit: 0.208 in. (5.275 mm)
3. Inspect the valve face for pitting, wear or corrosion.
4. Replace the valve if encounter any of the items above.
5. Repeat inspection for all valves.
1. Inspect the free length of the valve spring.
Figure 140
Page 7–18 1P65F-2 Service Manual
3429-270 Rev A