Kubota EA330-E4 Series - CHECKING, DISASSEMBLING AND SERVICING

ENGINE
EA330-E4, WSM
1-S13
4. CHECKING, DISASSEMBLING AND SERVICING
[1] CHECKING AND ADJUSTING
(1) Engine Body
Compression Pressure
1. Run the engine until warm up.
2. Stop the engine and remove the air cleaner and nozzle holder.
3. Attach a compression tester (Code No. 07909-30204) to the
adapter B or H.
4. After making sure that the speed control lever (1) is set at the
stop position (Non-injection), run the flywheel at 320 to
440 min
-1
(rpm) with starter and read constant maximum on the
tester. Execute the test at least twice. (Run the engine the for 5
to 10 seconds for each test.)
NOTE
• Measure specific gravity of the battery electrolyte and
ensure that the battery is fully charged.
• Compression occurs every second approximately when
the engine speed is 320 to 440 min
-1
(rpm). Try to learn this
"feeling" and ensure that the engine is running at this
speed range when measuring compression.
5. If the pressure does not reach the allowable limit, apply a small
amount of oil to the cylinder wall through the nozzle holder hole
and measure the pressure again.
6. If the pressure raises after applying oil, check the cylinder wall
and piston rings.
7. If the pressure is still low, check the top clearance, valve
clearance, cylinder head and piston rings.
9Y1211018ENS0005US0
Decompression Device
1. Align the T mark on the flywheel to the mark on the fan cover at
the top dead center in the compression stroke.
2. Remove the decompression cover from the cylinder head cover.
3. Pull the decompression lever (1) to the operating position.
4. Loosen the lock nut (3) and screw (2) until it contacts the rocker
arm (4).
5. From the position where the adjusting screw contacts the rocker
arm, further screw in the adjusting screw by one and a half turns
(9.42 ± 1.56 rad, 540 ± 90 °).
6. Tighten the lock nut.
7. After adjustment, make sure that the piston does not push up
the valve when slightly turning the flywheel with the
decompression lever.
(Adjusting screw pitch: 0.75 mm (0.030 in.))
9Y1211018ENS0006US0
Compression Pressure
Factory specification
3.48 MPa
35.5 kgf/cm
2
505 psi
Allowable limit
2.60 MPa
26.5 kgf/cm
2
377 psi
(1) Speed Control Lever
Decompression device Factory specification
0.940 to 1.31 mm
0.0370 to 0.0515 in.
(1) Decompression Lever
(2) Decompression Adjusting Screw
(3) Lock Nut
(4) Rocker Arm
KiSC issued 05, 2015 A