Westerbeke 5.0KW BCG-60Hz Service Manual page 18

ENGINE TIMING BELT
At this time, check that the moveable range of teeth on the
oil pump sprocket is according to specifications.
STANDARD VALUE: 410 5 teeth in forward direction.
1 to 2 teeth in reverse direction.
4. If the movable range of the teeth on the oil pump sprocket
exceeds the specified range, correct as follows:
a. Pull out the round bar from the plug hole in the left
side of the cylinder block.
h.
Turn
the oil pump sprocket one tum at a time until the
round bar can again be inserted.
c.
Check that the movable range of the oil pump sprocket
is in the specified value.
5. Set the timing belt over the crankshaft sprocket and then
over the oil pump sprocket and camshaft sprocket,
in
that
order.
NOTE: Ensure that the tension side of the timing belt is not
slack. Keep the round bar inserted until the timing belt has
been placed. After this step, be sure to remove the round bar.
6. Apply counterclockwise force to the camshaft sprocket to
make the belt taut on the tension side, and make sure that
all timing marks are lined up.
CAMSHAFT SPROCKET
TENSION SIDE
7. Loosen the temperorarily tightened tensioner nut on the
water pump side 1 or 2 turns, and tension the belt making
use of the spring force.
8. Tum the crankshaft
clockwise
by nine camshaft sprocket
teeth (81°) to align the timing mark on the camshaft
sprocket with the tensioner set mark on the timing belt
rear cover.
A
CAUTION:
This operation is performed to give a
proper tension to the timing belt, so do not
tum
the
crankshaft counterclockwise and push the belt to
check the tension.
TENSIONER SET MARK
9. Make sure that the timing belt teeth are engaged with the
camshaft sprocket teeth along the portion of the sprocket
shown by the curved arrow in the illustration below. Then
tighten the tensioner nut.
lO.Pull the timing belt in the center of the tension side
toward the sealing gasket line for the belt cover, as illus-
trated. Make sure that the clearance between the back of
the belt and the sealing line is the standard value.
STANDARD VALUE: O.47in. (12mm)
SEALING GASKET
LINE
0.47 In [12 mmJ
1l.PulI out the rod from the plug hole on the left surface of
the cylinder block and apply the specified sealant. Then
tighten the plug to the specified torque.
Specified sealant value: 3M AID Part No. 8660 or
equivalent.
TIGHTENING TORQUE: 11-16 ft.lbs. (15-22 Nm)
Engines & Generators
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