Camshaft And Rocker Arms - Westerbeke BCGB Service Manual

CAMSHAFT AND ROCKER ARMS
TORQUE 21 - 25 FT-LBS
TORQUE 21 - 25 Ft-Lbs 2! - 35 Nm
~
21-35Nm - - - ,
iii
NUMBERS INDICATE THE
SUGGESTED ORDER OF
DISASSEMBLY
10
ROCKER ARM
®
EXHAUST
1
:~~~~:::;B~~CKER
TORQUE
6 _ 7
FT_LBs~9WAVE ;AS~HER
8-10Nm
.~
8ROCKERAR
INTAKE
5
ROCKER A R M · • '"'
INTAKE
~
\6
WAVE WASHER )
3
W ' ' ' W ASHE.
~
,
1V~
<- ')
\1
=;;::Ii
2
~~R
ARM
4~~:8~TARM
12
CAMSHAFT .
~
OILSEAL
~
INSPECTING THE CAMSHAFT
1.
Visually inspection the camshaft for cracks and damage.
If necessary, replace the camshaft.
NOTE: If
the dmnage 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 -1.6124in (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 #1
#2
#3
Exhaust
#1
#2
#3
C:C-~O·
HEIGHT
~-
STANDARD
1.3815in (35.09mm)
1.3807in (35.01mm)
1.3803in (35.06mm)
1.3839in (35.15mm)
1.3831in (35.13mm)
1.3854in (35.19mm)
UMIT
1.3618in (34.59mm)
1.3610in (34.57mm)
1.3606in (34.56mm)
1.3642in (34.65mm)
1.3634in (34.63mm)
1.3657in (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