6-28 POWER UNIT
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2
Camshaft journal oil clearance
Measure journal oil clearance using Plastigauge as follows.
1. Clean housing and camshaft journals.
2. Install camshaft to cylinder head.
3. Place Plastigauge across full width of camshaft journal (par-
allel to camshaft).
\ 09900-22302 : Plastigauge (0.051 — 0.125 mm)
09900-22301 : Plastigauge (0.025 — 0.076 mm)
4. Install camshaft housing. According to numerical order in
figure, tighten housing bolts in 3 steps. (1/3 of specification,
2/3 of specification, full torque specification)
" 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 Plastigauge
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.)
1. Plastigauge
2. Scale
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 (1.0210 – 1.0219 in.)
Service limit : Top, 2nd, 3rd, 4th journal
22.869 mm (0.9004 in.)
5th journal
25.844 mm (1.0175 in.)
NOTE:
The location No.s of journal are in order from flywheel magneto
to the bottom of cylinder.
If journal oil clearance exceeds service limit, measure camshaft
journal (outside dia.) and camshaft housing (inner dia.). Based
on measurements, replace camshaft and/or cylinder head with
camshaft housing.
\ 09900-20205 : Micrometer
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