Camshaft; Camshaft; Journal~ ); Front Oil Seal Sliding Surface - Westerbeke W70GA Service Manual

CAMSHAFT
INSPECTION
I
REPAIR
CAMSHAFT
1. Check the cam for wear or damage.
Replace .ff
11~ces11ary.,
•
2. Check the
cam
lobe height at the two points as shown.
u
t.
t
3. Measure wear of the journals in X and Y directions at
the two points as shown.
DIAMETER
FRONT AND REAR:
31.940-31.965mm (1.2575-1.2585in)
CENTER THREE JOURNALS:
31.91D-31.935mm (1.2563-1.25731n)
FRONT OIL SEAL SLIDING SURFACE:
33.961--\M.OOOmm (1.338-1.339in)
OUT-O~RDUND: ~
8.115mm
(D.002~)
MAX.
~y
.
~
INSPECTING THE ~
f(
1;-_·,
CAMSHAFT B
r
4.
~spect
the fuel cam for wear or damage.
Replace if necessary.
HEIGHT: 37.&mm (1.481in)
. MINIMUM: 37.1 (1.452in)
FRQNT JOURNAL
.. CENTER JOURNAL
5. Check the camshaft runout. Replace if necessary. Set the
front and rear journals on V-blocks and rotate the
camshaft one full turn to measure deflection (runout).
RUNOUT: 0.03mm (0.0012in)
CAMSHAFT
TESTING
RUN·OUT
6. Measure the camshaft end play. If the end play
exceeds specification, replace the camshaft and/or
the cylinder head.
END PLAY: 0.118-G.16mm (0.003-0.00&in)
MAXIMUM: 0.20mm (0.008in)
7. Measure the oil clearance of the camshaft and
camshaft caps.
(l)
Remove any oil, or
dirt
from the journals and
bearing surface.
(2) Set
the
camshaft onto the cylinder head.
(3) Position plasti-gauge on top of the journals in
the
axial
direction.
· ( 4) Place
the
camshaft caps and rocker arm shafts in
position, and tighten them .to the specified torque.
TIGHTENING TORQUE:
18-26Nm (1.8-2.7 M-KG, 13-20 FT-LB)
(5) Remove the camshaft caps and
ineasure
the oil
clearance
at
each cap.
OIL CLEARANCE FRONT AND REAR:
0.035-0.085mm (0.0014-0.0033in)
CENTER THREE JOURNALS:
0.0651-0.115mm (0.002&-o.00451n)
MAXIMUM: D.15mm {0.0059in)
(6) If the oil clearance exceeds specification, replace the
cylinder head.
MEASURING .
··WITH
PLASTIGAUGE
Engines
~
Generators
18