1-S25
ZD18(F) · ZD21(F) · ZD28(F), WSM
ENGINE
[2] ENGINE BODY
(1) Checking and Adjusting
Compression Pressure
1. Run the engine until it is warmed up.
2. Stop the engine.
3. Disconnect the 2P connector from the fuel pump.
4. Remove the air cleaner, the muffler and all injection nozzles.
5. Disconnect the accelerator wire.
6. Engage the parking brake.
7. Set a compression tester (Code No. 07909-30208) with the
adaptor (Adaptor H, Code No. 07909-31231) to the nozzle hole.
8. While cranking the engine with the starter, measure the
compression pressure.
9. Repeat steps 7 and 8 for each cylinder.
10.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.
11.If the compression pressure is still less than the allowable limit,
check the top clearance, valve clearance and cylinder head.
12.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 %.
W1022478
Compression pressure
Factory spec.
2.84 to 3.24 MPa
29.0 to 33.0 kgf/cm
2
412 to 469 psi
Allowable limit
2.26 MPa
23.0 kgf/cm
2
327 psi
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