BOMBARDIER Johnson 90 Service Manual page 185

POWER UNIT
CYLINDER HEAD ASSEMBLY
Camshaft journal oil clearance
Measure journal oíl clearance using Plastigauge as follows.
1. Clean housing and camshaft journals.
2. Instan camshaft to cylinder head.
3. Place Plastigauge across full width of camshaft journal
(parallel to camshaft).
1©1
Plastigauge (0.051 -0.125 mm)
Plastigauge (0.025-0.076 mm)
4. lnstall camshaft housing. According to numerical order in
figure, tighten housing bolts in 3 steps. (1/3 of specifica­
tion, 2/3 of specification, full torque specification)
C!J
Camshaft housing bolt: 11 N-m (1.1 kg-m; 8.0 lb-ft)
NOTE:
Do not rotate camshaft while Plastigauge is installed.
5. Remove camshaft housing.
6. Using scale on Plastigauge envelope, measure Plastl­
gauge at its widest point.
Camshaft journal oil clearance:
Standard: Top, 2nd, 3rd, 4th journal
0.020- 0.062 mm (0.0008- 0.0024 in)
5th journal
0.045 - 0.087 mm (0.0018 - 0.0034 in)
Service limit: 0.12 mm (0.0047 in)
NOTE:
The location numbers of journal are in order from f/ywheel
magneto to the bottom of cylinder.
lf journal oil clearance exceeds service limit, measure carn­
shaft journal (outside dia.) and camshaft housing (inner día.).
Based on measurements, replace camshaft and/or cylinder
head with camshaft housing.
1fuit1
Micrometer
Camshaft journal outside diameter:
Standard: Top, 2nd, 3rd, 4th journal
22.959 - 22.980 mm (0.9039 - 0.9047 in)
5th journal
25.934 - 25.955 mm (1.021 O - 1.0219in)
Service limit:Top, 2nd, 3rd, 4th journal
22.869 mm (0.9004 in)
5th journal
25.844 mm (1.0175 in)
18 21 12 11
1. Plastigauge
2. Scale
2
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