Westerbeke 6.5 MCG Service Manual page 22

CAMSHAFT AND RO-CKER ARMS
Rocker Arm
Check each component part of the rocker arm assembly and
carefully inspect the individual rockers where the arrows
indicate.
ROCKER ARM
INSPECTION
Inspecting Clearance Rocker Arm And Shaft
Check the clearance between the rocker arm and shaft and, if
it exceeds the limit, replace the rocker arm or shaft.
ROCKER ARM CLEARANCE (ROCKER ARM TO SHAFT)
Standard 0.0005 • 0.0017in (0.012 • 0.043mm)
Limll 0.004in (0.1mm)
Rocker Shaft
1. Inspect the rocker shaft where the rocker arms sit for
water and damage. Replace the shaft if worn.
2. Measure the shaft length and the shaft outer diameter
(O.D.).
If
the shaft fails to meet the standards, replace
the shaft.
ROCKER SHAFT
LENGTH'standard 9.1341n (232mm)
3. Measure the end play of the camshaft by inserting a
feeler gauge in the gap between the rear of the thrust
_plate and the new front camshaft journal.
END PLAY Standard: 0.0020- 0.0098 in ( 0.05- 0.25mm ).
4. Using the oil seal installer tool, install the front oil seal in
the cylinder head.
ROCKER SHAFT 0.0.
Standard 0.6687- 0.66921n (16.985 -16.998mm)
~
~~II
or]
I
OIL HOLES OIL HOLES
INSTALLATION
1. Apply a coating of engine oil to the camshaft journals
and cams and insert the camshaft through the rear of the
cylinder head.
2. Install the camshaft thrust plate as shown in the diagram .
tighten the bo}ts to the specified torque.
THRUST PLATE BOLTTORQUE 7- 91t-lbs (10 -12Nm)
TORQUE
BOLT
5. Install the rocker arm/rockershaft assembly. Install the
rocker shaft so the portion shown in the diagram is
located on the front.
BOLT HOLE
FRONT
BOTTOM VIEW
. OIL HOLE
6. Tighten the rocker arm shaft bolts (4 bolts) uniformly and
then to the specified torque.
ROCKER ARM SHAFT BOLT TORQUE 21 • 25ft·lbs (29 • 35 Nm)
Engines & Generators
20