OC60-E2, OC95-E2, WSM
ENGINE
S-41
[3] SARVICING
(1) Clinder Head and Valves
Cylinder Head Surface Flatness
1. Thoroughly clean the cylinder head surface.
2. Place a straightedge on the cylinder head's four sides and two
diagonal as shown in the photo.
3. Measure the clearance with a thickness gauge.
4. If the measurement exceeds the allowable limit, correct it with
a surface grinder.
A
Do not place the straight edge on the combustion
chamber.
Cylinder Head Flaw
1. Prepare an air spray red check.
2. Clean the surface of the cylinder head with the detergent (2).
3. Spray the cylinder head surface with the red permeative liquid
(1). Leave it five to ten minutes after spraying.
4. Wash away the red permeative liquid on the cylinder head
surface with the detergent (2).
5. Spray the cylinder head surface with the white developer (3).
6. If flawed, it can be identified as red marks.
Valve Recessing
1. Clean the cylinder head, the valve face and seat.
2. Insert the valve into guide.
3. Measure the valve recessing with a depth gauge.
4. If the measurement exceeds the allowable limit replace the
valve.
5. If it still exceeds the allowable limit after replacing the valve,
replace the cylinder head.
Cylinder head surface
flatness
Allowable limit
0.05 mm
0.0020 in.
0000009255E
(1)
Red Permetive Liquid
(3)
White Developer
(2)
Detergent
00000007716E
Valve recessing
Factory spec.
0.60 to 0.85 mm
0.0236 to 0.0335 in.
Allowable limit
1.3 mm
0.0512 in.
0000009257E
