Westerbeke 6.5 MCG Service Manual page 21

CAMSHAFT AND ROCKER ARMS
TORQUE 21 • 25 FT·LBS
NUMBERS INDICATE
THE
SUGGESTED ORDER OF
DISASSEMBLY
TORQUE21·25Ft-Lbs~SSNm ~
21-35Nm
~
I
1QROCKER ARM
®
EXHAUST
INSPECTING THE CAMSHAFT
L Vlsually inspection the camshaft for cracks and damage.
, If necessary, replace the camshaft.
NOTE:
If
the damage is slight, you may be able to correct the
camshaft with an oil soaked fine emery grindstone. Take
special care to not damage the original cam form.
2. Inspect the camshaft journal
and,
if wearing exceeds the
limit, replace
the
camshaft.
CAMSHAFT JOURNAL DIAMETER
STANDARD 1.6118 -1.612410 (40.940 • 40.955mm)
CHECK JOURNAL BEARINGS
FOR WEAR DAMAGE
Camshaft
NOTE:
If
the Journal is seized, also check the cylinder head!
3. Measure
the
cam height and, if it is less than the limit,
replace the camshaft.
CAMSHAFT HEIGHT
Intake
t1
12
#3
Exhaust t1
12
13
c:r:-~0
HEIGHT
_l_
STANDARD
1.38151o (35.09mm)
1.3807io (35.07mm)
1.3803io (35.06mm)
1.38391n (35.15mm)
1.3831in (35.13mm)
1.3854in (35~19mm)
14CAMSHAFT
UMIT
1.361Bio (34.59mm)
1.3&10io (34.57mm)
1.3&06io (34.5&mm)
1.3&421o (34.65mm)
1.36341o (34.63mm)
1.36571n (34.69mm)
MEASURING
CAMSHAFT HEIGHT
4. Inspect the clearance between the camshaft journal and
the camshaft support bore as follows:
a. Measure the camshaft journal diameter and the
camshaft support bore.
b.
Calculate
the
clearance and replace the camshaft or
cylinder head if the clearance exceeds the limit.
BEARING OIL CLEARANCE
STANDARD 0.0018 • 0.0033in (.045 • 0.085mm)
Engines
&
Generators
19.