BRP Johnson J30TEL4SUA 2007 Service Manual page 144

POWERHEAD
CYLINDER HEAD
If the measurement exceeds the service limit,
replace the rocker arm and/or the shaft.
Rocker Arm-to-Shaft Clearance
Standard
Service Limit
1. Rocker arm
2. Rocker arm shaft
142
0.0005 – 0.0018 in.
( )
0.012 – 0.045 mm
( )
0.0035 in. 0.090 mm
001483
Valve Stem and Valve Guide
Use a micrometer to measure the outside diame-
ter of the valve stems. Be sure to take readings at
more than one place along the length of each
valve stem.
Valve Stem Outside Diameter
Intake valve
Exhaust valve
1
2
Use a bore gauge to measure the inside diameter
of the valve guides. Be sure to take readings at
more than one place along the length of each
valve guide.
Valve Guide Inside Diameter
Intake valve
Exhaust valve
0.2152 – 0.2157 in.
( )
5.465 – 5.480 mm
0.2146 – 0.2152 in.
( )
5.450 – 5.465 mm
001491
0.2165 – 0.2170 in.
(5.500 – 5.512 mm)
0.2165 – 0.2170 in.
(5.500 – 5.512 mm)
001492