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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 dis connect the 2P connector
from the s top s olenoid to p revent fuel delivery to the
engine.
3. Remove the the air cleaner, the muf fler and all the in-
jection nozzles.
4. Install acompression tester with the adapter in one of
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. If the measurement is below the allowable limit, add a
small amount of oilto the cylinder thru the nozzlehole
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. If the compression pressure increases afterapplying
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 P res-
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 to Section 2.2.3.a)
2. Remove the cylinder head.
3. Move the piston (1) up and stick a strip of p lastic
gauge (2) onthe piston headat three positions shown
on the illustration.
4. Lower the piston and install the c ylinder head. (Use a
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. If the measurement is not within the factory specifica-
tions, check the clearances between the crank pin
and bearing and between the piston pin and bushing.
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