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ENGINE ADJUSTMENTS
NOTE:
WESTERBEKE recommends that the following engine
adjustments be peiformed by a competent engine mechanic.
The information below is provided to assist the mechanic.
8. Tum the crankshaft clockwise by nine camshaft sprocket
teeth (817) 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 turn the
crankshaft counterclockwise and push the belt to
check the tension.
:::
;;;;~;;;;::;;:::-
TENSIONER
.:n;.~-
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.
10. Pull the timing belt in the center of the tension side
toward the sealing gasket line for the belt cover, as
illustrated. Make sure that the clearance between the
back of the belt and the sealing line is the standard
value.
Standard Value: 12mm (0.47in.)
SEALING
LINE
"'i
f---1:!MM (0.47 IN)
11. Pull out a 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: 15-22 Nm (11-16 ft.lbs.)
ENGINE COMPRESSION TEST
1. To check the engine's compression pressure, warm up the
engine then shut it down.
2. Remove the three spark plug caps and remove the three
spark plugs.
3. Install a compression adapter and gauge in the spark plug
hole.
4. Close off the raw water intake seacock.
5. Crank the engine with the start motor and unplug the
ignition coil and allow the compression gauge to reach a
maximum reading and record.
6. Measure the compression pressure for all the cylinders .
Ensure that compression pressure differential for each
cylinder is within the specified unit.
Compression pressure should not differ by more than 14 psi (100 Kpa).
7.
If a cylinder's compression or pressure differential is
below the limit, add a small amount of engine oil through
the spark plug hole and repeat steps 4 and 5.
(a) If additional of oil causes an increase of pressure, the
piston ring and/or cylinder wan may be worn or damaged.
(b) If additional oil does not increase compression pres-
sure suspect poor valve contact, valve seizure, or valve
wear.
S. Reinstall three plugs and ignition wires.
9. Open the raw water thm seacock.
COMPRESSION
GAUGE
(TYPICAL)
""'" WESTERBEKE
Engines & Generators
32
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