STV32 · STV36 · STV40, WSM ENGINE
1-S46
[4] SERVICING
(1) Cylinder Head and Valves
Cylinder Head Surface Flatness
1. Clean the cylinder head surface.
2. Place a straightedge on the cylinder head's four sides (A), (B),
(C) and (D) and two diagonal (E) and (F) as shown in the
figure.
Measure the clearance with a feeler gauge.
3. If the measurement exceeds the allowable limit, correct it with
a surface grinder.
A Do not place the straightedge on the combustion
chamber.
A Be sure to check the valve recessing after correcting.
Cylinder Head Flaw
1. Prepare an air spray red check (Code No. 07909-31371).
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.
Cylinder head surface
flatness
Allowable limit
0.05 mm
0.0020 in.
0000002081E
(1) Red Permetive Liquid (3) White Developer
(2) Detergent
0000000875E
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