BOMBARDIER RALLY 200 2003 Shop Manual page 137

VALVE STEM DIAMETER mm (in)
NEW MINIMUM
EXHAUST
INTAKE
NEW MAXIMUM
EXHAUST
INTAKE
SERVICE LIMIT
EXHAUST
INTAKE
Replace valve guide out of cylinder head if valve
guide is out of specification or has other damages
such as wear or friction surface (see VALVE
GUIDE PROCEDURE below).
VALVE GUIDE DIAMETER mm (in)
SERVICE LIMIT
EXHAUST
INTAKE
Valve Face and Seat
1. Valve seat
2. Exhaust valve contaminated area
3. Valve face (contact surface to valve seat)
VMR2003_012_03_08A.FM
3.96 mm (.1559 in)
3.97 mm (.1563 in)
3.97 mm (.1563 in)
3.98 mm (.1567 in)
3.940 mm (.1551 in)
4.060 mm (.1598 in)
Subsection 08 (CYLINDER AND HEAD)
Check valve face and seat for burning or pittings
and replace valve or cylinder head if there are signs
of damage.
Ensure to seat valves properly. Apply some lapping
compound to valve face and work valve on its seat
with a lapping tool (see VALVE GUIDE PROCE-
DURE below).
Measure valve face contact width.
NOTE: The location of contact area should be in
center of valve seat.
Measure valve seat width, using a caliper.
VALVE SEAT CONTACT WIDTH mm (in)
NEW
EXHAUST
INTAKE
SERVICE LIMIT
EXHAUST
INTAKE
If valve seat contact width is too wide or has dark
spots, replace the cylinder head.
A. Valve face contact width
B. Valve seat contact width
Section 03 ENGINE
1.25 to 1.55 mm
(.049 to .061 in)
1.05 to 1.35 mm
(.041 to .053 in)
2 mm (.078 in)
1.8 mm (.07 in)
03-08-15