Engine Compression Test; Ignition Timing - Westerbeke 8.0 KW-60Hz SBEG Operator's Manual

ENGINE ADJUSTMENTS
NOTE:
WESTERBEKE recommends that the following engine adjust-
ments be peifonned by a competent engine mechanic. The information
below is provided to assist the mechanic.
ENGINE COMPRESSION TEST
1. To check the engine's compression pressure, wann up the
engine then shut it down.
2. Remove the spark plugs and install a compression
adapter (screws into a plug hole) with a gauge.
3. Close off the raw water intake seacock.
4. Crank the engine with the start motor and unplug the
ignition coil and allow the compression gauge to reach a
maximum reading and record.
S. Measure the compression pressure for all the cylinders.
Ensure that compression pressure differential for each
cylinder is within the specified limit.
Compression pressure should not differ bV more than 14 psi (100Kpa).
6. 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 3 and 4.
a) If addition of oil causes an increase of pressure, the
piston ring and/or cylinder wall may be worn or
damaged.
b) If additional oil does not increase compression
pressure, suspect poor valve contact, valve seizure,
or valve wear.
7. Re-install plugs and ignition wires.
8.
Open the raw water seacock (thrn-hull).
MEASURING
COMPRESSION
IGNITION TIMING
DIAL GAUGE
1. Attach a timing light to the # I spark plug and mark the
front crankshaft timing groove and the timing mark on
the scale embossed on the engine's front cover.
Each timing mark represents 5·.
CRANKSHAFT
PULLEY
IGNITION
TIMING
2. Start the engine and warm the engine to its nonnal
operating temperature.
3. Using the timing light, align the timing groove in the
front crankshaft pulley with the proper timing mad<: on
the ignition timing scale embossed on the engine's front
cover. Do this by loosening and slowly rotating the
distributor body. refer to the timing specification:
IGNmON TIMING AT 1800 RPM:
15· BToC
±
1· STATIC (NO VACUUM ADVANCE)
(33· - 35· AT NO-LOAD WITH VACUUM ADVANCE)
TESTING OIL PRESSURE
OIL PRESSURE GAUGE
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OIL GALLERY
OIL: PRE,SSU,RE
LOW OIL PRESSURE
The specified safe minimum oil pressure is 4.3 - 1.4 psi(O.3 -
0.1 kg/em".
An
oil pressure of 5 PSI will shut the engine
down. A gradual loss of oil pressure usually indicates worn
bearings. For additional infonnation on low oil pressure read-
ings, see the ENGINE TROUBLESHOOTING chart.
TESTING OIL PRESSURE
To test oil pressure, remove the oil gallery
"T'
and install a
mechanical oil pressure gauge in its place. After warming up
the engine, read the oil pressure gauge.
OIL PRESSURE 35.0 IbM (3.8 kg/em') or more at 1800 rpm
(depending on temperature and load)
SENooR AND SWITCH TORQUE 9 -13 H-Ib (1.2 -1.8 m-kg)
"'" WESTERBEKE
Engines & Generators
20