Westerbeke 8.0KW-60Hz Service Manual page 27

ENGINE INSPECTION
10. Camshaft
a. Measure the diameter of the joUrnal and the bore in the
bushing for the shaft to find the clearance as shown in
the illustration. If the clearance exceeds the limit,
replace the bushing.
CLEARANCE BETWEEN THE CAMSHAFT JOURNAL AND BUSHING
STANDARD 0.0059 In (0.15mm)
MEASURING THE CAMSHAFT
JOURNAL
b. Use Camshaft Bushing Installer( ~pecial tool) for
camshaft bushing replacement.
(1)
Remove the oil pan. Using a "remover" end of the
cylinder, push out the bushing into the cylinder' .
block. Crush and take out the bushing from the
block.
CAMSHAFT
BUSHING
CAMSHAFT
(2)
Install a new bushing in position with its oil holes
. in alignment with those of the oil gallery.
---+-11-- ..
~~
-L.JF~"~-"-cW
0.04in·(1 mm,..JL
. OIL HOLES
INSTALLING THE
.·CAMSHAFT
BUSHING
·.NOTCH IN
BUSHING
'--Jk,<-I--IENDS OF
~~~i:P
BUSHING .
(3)
Measure the lobe height and base circle as shown
in the illustration. Subtract the baSe circle' from the
lobe'height to find the lobelift. If the lobe lift
exceeds' the limit, replace the camshaft. .
LOBE HEIGHT OF CAMSHAFT
STANDARD 1.4063 in (35.72mm)
LIMIT 1.3669 in (34.72mm)
MEASURING THE
LOBE HEIGHT OF
. THE CAMSHAFT
11. Fuel injection pump camshaft. Measure the lobe height
and base circle as shown in the illustration. Subtract the
base circle from the lobe height to find the lobeliftc If
. the lobe lift exceeds the limit; replace the camshaft.
LOBE HEIGHT OF FUEL INJECTION PUMP CAMSHAFT
STANDARD 1.73 In (44mm)
LIMIT 1.69 in (43mm)
..,.,.-:-----.¢ .....
~~~~MIEASURifo"
THE'
MEASURING'
DIRECTION
12. Tappets.
LOBE HEIGHT OF THE
FUEL INJECTION PUMP
CAMSHAFT
a. Check the cam contact face of each tappet for abnormal
wear. Replace the tappet if the face is defective.
b. Measure the diameter of the tappet and the bore in the
cylinder block for the tappet to find the clearance. If the
clearance exceeds the limit, replace the tappet.
CLEARANCE BETWEEN THE TAPPET AND THE CYLINDER BLOCK
STANDARD 0.0059 In (0.15mm)
OOe]
.. '. .
GOOD
BAD
BAD
CAM CONTACT FACE OF THE TAPPET
~
WESJERBEKE
Engines·& Generators
21