OC60-E2, OC95-E2, WSM
ENGINE
S-12
4. CHECKING, DISASSEMBLING AND SERVICING
[1] CHECKING AND ADJUSTING
(1) Engine Body
Compression Pressure
1. After warming up the engine, stop it and remove the air
cleaner, and nozzle holder.
2. Install a compression tester for diesel engines to nozzle holder
hole.
3. After making sure that the speed control lever is set at the stop
position (Non-injection), run the engine at 3.3 to 5.0 1/s (200
to 300 rpm) with the starter.
4. Read the maximum pressure. Measure the pressure more
than twice.
5. If the measurement is below the allowable limit, check the
cylinder, piston ring, top clearance, valve and cylinder head.
6. If the measurement is below the allowable limit, apply a small
amount of oil to the cylinder wall through the nozzle hole and
measure the compression pressure again.
7. If the compression pressure is still less than the allowable limit,
check the top clearance, valve clearance and cylinder head.
8. If the compression pressure increases after applying oil, check
the cylinder wall and piston rings.
A
Check the compression pressure with the specified valve
clearance.
A
Always use a fully charged battery for performing this
test.
A
Variances in cylinder compression values should be
under 10 %.
Valve Clearance
A
The valve clearance must be inspected and adjusted as
needed when the engine is cold (equal to the atmospheric
air temperature).
Compression pressure
Factory spec.
3.43 to 3.92 MPa
35 to 40
497 to 568 psi
Allowable limit
2.47 MPa
25.2
358 psi
0000009191E
Valve clearance (Cold)
Factory spec.
0.14 to 0.18 mm
0.0055 to 0.0071 in.
(1)
Valve Clearance
0000009192E
