2-- 1
62--11362
SECTION 2
ENGINE BODY
2.1 CHECKING AND ADJUSTING
2.1.1 Compression Pressure
1. Run the engine until it is warmed up.
2. Stop the engine and disconnect the 2P connector
from the stop solenoid to prevent fuel delivery to the
engine.
3. Removethethe air cleaner, themuffler and all the in-
jection nozzles.
4. Installa compressiontesterwiththe adapterin oneof
the nozzle hole.
5. While cranking the engine with the starter measure
the compression pressure.
6. Repeat steps 4 and 5 for each cylinder.
7. Ifthemeasurementis belowtheallowable limit,add a
smallamount of oilto thecylinder thruthenozzlehole
and measure the compression again.
a. If the compression pressure is still less than the al-
lowable limit, check the top clearance, valves and
cylinder head.
b. Ifthecompressionpressureincreasesafterapplying
oil, check the cylinder wall and piston rings.
NOTE
Check the compression pressure with the spe-
cified valve clearance
Always use a fully charged battery for perform-
ing this test.
Variances in cylinder compression values
should be under 10%.
Compression Pres-
sure
Factory
Specification
2.95 to 3.23 MPa
30 to 33 kgt/cm
2
427 to 469 psi
Allowable Limit
2.35 MPa
24 kgt/cm
2
341 psi
2.1.2 Top Clearance
1. Piston 2 Plastic gauge
1. Remove the valve cover. (Refer t o Section 2.2.3.a)
2. Remove the cylinder head.
3. Move the piston (1) up and stick a strip of plastic
gauge(2)onthepistonheadatthreepositionsshown
on the illustration.
4. Lower the piston and install the cylinderhead. (Usea
new cylinder head gasket and tighten the cylinder
head bolts to the proper torque.
5. Turn the flywheel until the piston (1) passes through
top dead center.
6. Remove the cylinder head and measure the plastic
gauge.
7. Ifthemeasurementis not withinthefactoryspecifica-
tions, check the clearances between the crank pin
and bearing andbetweenthepistonpin andbushing.
Top Clearance
Factory
Specification
0.60 to 0.70 mm
0.024 to 0.027 in.
Tightening
Torque
Cylinder Head
Bolts
93.2 to 98.0 N
.
m
9.5 to 10.0 kgf
.
m
68.8 to 72.3 ft--lbs
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