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ENGINE ADJUSTMENTS
ENGINE COMPRESSION TEST
NOTE:
The activation of
the
starter motor is a function of
the ECU (Electronic Control Unit). To by-pass the ECU, a
simple electrical jumper arrangement can be fabricated to
connect between the battery B+ cable connection on the
starter solenoid
and
tlte spade type activation connection on
the starter solenoid with a push button
in
this jumper to make
a circuit between these two connections and activate
the
starter solenoid.
1. Start the engine and allow it to warm up to its nonnal
operating temperature. Then shut it down.
2. Open the DC breaker on the unit's control box to disable
the ECU. Connect the jumper arrangement orr the starter
solenoid connections.
3. Close the .raw water seacock. This is to
prevent the raw water pump from pumping water
i~to
the
unit's exhaust system during the test
as
no or very little ·
exhaust pressure will be present during the test to help
expel water from the unit's exhaust system during engine
cranking.
·
4. Remove the high tension leds from the spark plugs and
remov~
all
spark plugs.
5. Thread the compression gauge adapter into the spark
plug -opening of cylinder #1. Connect the compression
gauge to the adapter.
CONNECTING TO THE
THE SOLENOID ON THE
STARTER.
Cylinder ·Head Bolts
REFER TOmE.WIRING
DIAGRAM IN m1s MANUAL
FOR WIRE CONECTIONS .
Tighten the cylinder head bolts in the order shown in the dia-
gram
using a stepped-up tightening torque.
1. Temporarily tighten the bolts in numerical order to 14-
22ft-lbs (20 - 30 Nm).
2. Tighten the bolts again in numerical order to 29- 36ft-lbs
(40- 50Nm).
3. Tighten the bolts in numerical order to the specified
torque ..
CYLINDER HEAD TORQUE
43_-51ft·lbs (60 • 70Nm)
6. Activate the starter motor using the push button on ,the
electrical jumper arrangement for the starter. Allow the .
engine to crank, observing the compression gauge. Allow
the engine to crank until the gauge reaches a maximum
reading wherefurther cranking does not produce a higher
reading on the ·compression gauge. Stop cranking and
record the
~sure.
7. Remove the compression gauge and adapter from the #1
spark plug opening and install it
in
the #2 cylinder spark
plug opening and repeat step -. . 6.
8.
Proceed to the next cylinder and repeat step
#6 until all
cylinderS have been
tested
and
the~ pr¢s~
recorded.
STANDARD COMPRESSION PRESSURE AT 400 RPM
178 PSI (12.5 KG/CM
2 )
.
Cylinder pressures should not differ mot•e than 14 psi
Ensure that compression press1,1re differential
for
each
cylinder is within the specified unit.
9.
Reinstall three plugs and ignition wires. Open
the,
seacock.
NOTE:
A wet test can be performed on cylirz4ers with low
compression figures; This will help determine
~(the
low·
comp'i'ession is the;fesult'idfwom cylinders/rings or worn
valve seats/valves or
both.
Place a
few
squirts of oil into .
the cylinder and the peiform the compression test on that
cylinder.
a.
A dramatic rise in recorded compression value would
indicate worn cylinder/rings.
b.
A minimal rise in recorded compression value
would indicate both cylinder/ring and valve wear.
c.
No appreciable rise in recorded compression would
indicate valve/valve seat wear.
ELECTRICAL
·JUMPER
. ·uSING AN ELECTRICAL JUMPER
TO BY-PASS THE ECU.
Rocker Cover
Install the rocker cover using a new gasket (slightly coat both
sides with clean oil). Gradually tighten the cover bolts to the
specified torque making certain the cover gasket is positioned
properly.
ROCKER. COVER i:IDLT TORQUE (Smm BOLT).
2.9 • 5.2 ft·lbs (4 • 7Nm)
6
4
¢1.
ENGINE FRONT
.7
1
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