Operation Manual

BX25, RCK54(P)-23BX, RCK60B-23BX, LA240, BT601, WSM
ENGINE
[3] SERVICING
(1) Cylinder Head and Valves
3TMABAB1 P056A
Cylinder Head Surface Flatness
1. Clean the cylinder head surface.
2. Place a straightedge on the cylinder head's four sides and two
diagonal as shown
in the figure.
3. Measure the clearance with a thickness gauge.
4. If the measurement exceeds the allowable limit, correct it with a
su rface grinder.
• IMPORTANT
• Do not place the straightedge on the combustion chamber.
• Be
sure to check the valve recessing after correcting.
Cylinder head surface 0.05mm
Allowable limit
flatness
0.0020 in.
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3TMABABOP059B
Cylinder Head Flaw
1. Prepare an air spray red check.
2. Clean the surface of the cylinder head with 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 read permeative liquid on the cylinder head
surface with the detergent (2).
5. Spray the cylinder head surface with white developer (3).
6. If flawed, it can be identified as red marks.
(1) Red Permeative Liquid
(3) White Developer
(2) Detergent
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