Checking, Disassembling And Servicing; Checking And Adjusting; Engine Body - wsm B2420 Workshop Manual

B2420, WSM

4. CHECKING, DISASSEMBLING AND SERVICING

[1] CHECKING AND ADJUSTING

(1) Engine Body

Compression Pressure
1. Run the engine until it is warmed up.
2. Stop the engine.
3. Remove the air cleaner, the muffler and all injection nozzles.
4. Keep the engine stop lever at "Stop Position".
5. Engage the parking brake.
6. Set a compression tester (Code No. 07909-30208) with the
adaptor (Adaptor H, Code No. 07909-31231) to the nozzle hole.
7. While cranking the engine with the starter, measure the
compression pressure.
8. Repeat steps 6 and 7 for each cylinder.
9. 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.
10. If the compression pressure is still less than the allowable limit,
check the top clearance, valve clearance and cylinder head.
11. 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 preforming this test.
• Variances in cylinder compression values should be under
10 %.
Factory specification
Compression pressure
Allowable limit
1-S10
ENGINE
3.73 to 4.11 MPa
2
38.0 to 42.0 kgf/cm
541 to 597 psi
2.26 MPa
2
23.0 kgf/cm
327 psi
9Y1210436ENS0004US0
KiSC issued 06, 2012 A