ENGINE – Cylinder Head and Valves
11-50
VALVE GUIDE REPLACEMENT PROCEDURE
(1) Force the valve guide out toward the cylinder block using
a press.
(2) Machine the valve guide hole in the cylinder head to
the size of the oversize valve guide to be installed.
Caution
Do not use the valve guide of the same size as the
removed one.
Valve gauge hole diameters in cylinder head
Item Standard value mm
0.05 O.S. 12.05 – 12.07
0.25 O.S. 12.25 – 12.27
0.50 O.S. 12.50 – 12.52
(3) Press-fit the valve guide until it protrude specified value
19.5 mm as shown in the illustration.
Caution
1. Press the valve guide from the cylinder head top
surface.
2. Valve guide for intake valve and that for exhaust
valve are different in length. (45.5 mm for intake
valve; 50.5 mm for exhaust valve)
(4) After the valve guide has been installed, insert a new
valve to check for smooth sliding motion.
1EN0106
Protrusion
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