Section 03 ENGINE
Subsection 08 (CYLINDER HEAD)
Inspect valve condition. Valve blade should not be
bent and should rest against its seat.
vmr2006-073-050_a
Replace valve as necessary.
Cylinder Head
Check if spark plug and valve ports are cracked.
Check also between valve seats.
Measure cylinder head warpage with a straight
edge and a feeler gauge.
vmr2006-020
WARPAGE
Service limit
0.50 mm (.020 in)
Camshaft
Check each lobe of camshaft for scoring, scuffing,
cracks or other signs of wear.
Manually turn each bearing to see if it turns freely,
smoothly and noiselessly. Check for radial and
axial play.
vmr2006-0-73-021_a
1. Bearing
2. Lobe
3. Bearing
Measure cam lobe with a micrometer.
vmr2006-073-021_b
CAMSHAFT LOBE
DESCRIPTION
INTAKE
EXHAUST
New
34.880 mm
(1.3732 in)
34.740 mm
(1.3677 in)
Service limit
34.860 mm
(1.3724 in) min.
34.725 mm
(1.367 in) min.
If any component does not meet requirements,
replace camshaft as a set with bearings.
Rocker Arm
Inspect each rocker arm for cracks and scored
friction surfaces. Ensure lubrication hole is not
plugged.
Measure rocker arm bore diameter.
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vmr2006-073
Содержание BOMBARDIER DS250 2006
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