Engine; Engine Body; Checking And Adjusting - Kubota WSM J Series Workshop Manual

J SERIES, WSM

3. ENGINE

[1] ENGINE BODY

(1) Checking and Adjusting

Compression Pressure
1. After warming up the engine, stop it and remove the air cleaner,
the muffler and all nozzle holders.
2. Install a compression tester (Code No: 07909-30207) 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 5.0s
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 and cylinder head.
8. If the compression pressure increases after applying oil, check
the cylinder wall and piston rings.
NOTE

• Check the compression pressure with the specified valve
clearance.
• Always use a fully charged battery for performing this test.
• Variances in cylinder compression values should be under
10 %.
Factory spec.
Compression pressure
Allowable limit
S-58
ENGINE
-1
(200 to
2.84 to 3.24 MPa
2
29.0 to 33.0 kgf/cm
412 to 469 psi
2.26 MPa
2
23.0 kgf/cm
327 psi
W10104820
KiSC issued 10, 2016 A