Engine Adjustments; Compression Test; Water Pump Belt; Ignition Timing - Westerbeke 3.0KW BPMG-60HZ Service Manual

ENGINE ADJUSTMENTS
ENGINE COMPRESSION TEST
10 check the engine's compression pressure, wann up tl,e
engine, then shut it down.
1. Remove both spark plug caps and both spark plugs.
2. Install a compression adapter and gauge in a spark
plug hole.
3. Close the
thru hull valve (seacock).
4. Crank the engine several times quickly so that the gauge
pointer reaches it's maximum.
STANDARD COMPRESSION PRESSURE AT 500 RPM:
71 PSI (5± 1 Kg/cm')(D.4± 0.1 MPa)
S. Test the compression pressure on the other cylinder.
If either cylinder is below the standard
try
adding a
small amount of engine oil through tl,e spark plug hole
and repeat the test.
<a) If additional oil causes an increase of pressure,
the piston ring
andlor
cylinder may be worn
or damaged.
(b) If additional oil does not increase compression
pressure suspect poor valve contact, valve seizure
or valve wear.
6. Reinstall the two plugs, connect the wires and open the·
thru
hull valve (seacock),
IGNITION DMING
The magneto employs the electric ignition advance system
that
advances
ignition timing with an increase of engine
speed. While rurming the engine, check the ignition timing
with a timing light.
There are nine (9) markings (TOC, ATDC 5' and BTDC 5',
10',
15°, 20", 25°, 30°, 35) on the flywheel cup.
Check the timing while observing the position of the carved
marking on the starter case.
WATER PUMP BELT
To remove, replace or adjust the belt, loosen the pivot bolt
and release the adjusting bolt. Slide tlle water pump bracket
to slacken the belt for removal. When replacing and
adjusting the
bel~
set the belt very tight and tighten the bolt
and nut.
The dual water pumps on the
FRESH WATER COOLED
MODELS
use the same drive belt and the adjusbnent is tlle
same.
RAW WATER PUMP
,AD,JUS
IIING BOLT
"
"",
WATER PUMP !t~A,CKE'(
NOTE:
The adjusn;l£nt
is
the same for the FRESH WATER
COOLED MODEL dual
pumps.
30
BTDC
25
IGNITION TIMING
IN DEGREES
20
10
5
0
I
I
0 3 4 5
6 X 10 3
FLYWHEEL
_--:=--___
=
Engine speed rpm
~,...,.-~
.... 7'1"-( .".;; __
"--l5r __ ~CARVED
MARKINGS
Engines
&
Generators
39