BRP Johnson J30TEL4SUA 2007 Service Manual page 146

POWERHEAD
CYLINDER HEAD
Ream the valve guide hole with a 10.5 mm reamer
to true the hole and remove any burrs.
IMPORTANT:
Turn the reamer in a clockwise
direction, NEVER counterclockwise.
Heat the cylinder head to a temperature of 80 to
100°C (176 to 212°F). Apply heat uniformly so the
head will not become distorted.
Use a valve guide installer to drive the new valve
guide into the hole until the attachment contacts
the cylinder head.
After installation, check the valve guide protrusion.
The protrusion for the intake and exhaust valves
should be 0.55 in. (14 mm).
1
1. Valve guide protrusion
2. Valve guide installer handle
3. Valve guide installer attachment
144
Ream the valve guide bore with a 5.5 mm reamer.
Clean and oil the valve guide bore after reaming.
1. Valve guide
2. Reamer
Valve Head and Valve Seat
001505
Use a set of "V" blocks to support the valve on a
surface plate. Use a dial gauge to measure the
valve stem runout.
The service limit for valve stem runout is 0.002 in.
(0.05 mm). If the measurement exceeds this spec-
ification, replace the valve.
2
3
Use a "V" block to support the valve on a surface
plate. Use a dial gauge to measure the valve head
radial runout.
001506
2
1
001507
001495