Kubota WSM ZD321 User Manual

1-S20
ZD321, ZD326, ZD331, WSM
ENGINE
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 glow plugs (or
nozzles).
4. Set a compression tester with the adaptor to the glow plug hole
(or nozzle hole).
Nozzle hole : Adaptor H (07909-31231)
Glow plug hole : Adaptor L (07909-31301)
5. After making sure that the stop lever is set at the stop position
(non-injection), run the engine with the starter and measure the
compression pressure.
6. Repeat steps 4 and 5 for each cylinder.
7. If the measurement is below the allowable limit, apply a small
amount of oil to the cylinder wall through the glow plug hole (or
nozzle hole) and measure the compression pressure again.
8. If the compression pressure is still less than the allowable limit,
check the top clearance, valve clearance and cylinder head.
9. 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 %.
[D782-E2-ZD]
[D1005-E2-ZD, D1305-E3-ZD]
W10178940
Compression pressure
Factory spec.
2.84 to 3.24 MPa
29 to 33 kgf/cm
2
412 to 469 psi
Allowable limit
2.26 MPa
23 kgf/cm
2
327 psi
Compression pressure
Factory spec.
3.73 to 4.11 MPa
38.0 to 42.0 kgf/cm
2
541 to 597 psi
Allowable limit
2.26 MPa
23.0 kgf/cm
2
327 psi
KiSC issued 04, 2007 A

Kubota WSM ZD321 Specifications

General

Brand	Kubota
Model	WSM ZD321
Category	Lawn Mower
Language	English