Valve Clearance - Kubota Z400-B Handbuch

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Checking Compression Pressure
1. Warm up the engine and stop it.
2. Remove the air cleaner and the muffler.
3. Remove the nozzle holders from all the cylinders.
4. Set a compression tester (Code No. 07909·30200) to
the nozzle holder hole.
5. Cut the fuel (pull the stop lever), and run the engine for
5 to
10
seconds (at 200 to 300 rpm) and read the maxi·
mum pressure.
Execute the test at least twice.
6. I f the compression pressure is less than the allowable
limit, pour a small amount of engine oil through the
nozzle holder hole and test again.
7. If the compression pressure reaches the allowable limit,
check the cylinder liner and the piston rings.
If not,
check the top clearance, valve and cylinder head.
3.09 MPa
Factory
31.5 kgf/cm'
Compression
spec.
448 psi
pressure
Allowable
limit
2.32 MPa
23.7 kgf/cm'
337 psi
• NOTE:
• For the test, use a fully charged battery and the specified
valve clearance.
• Variances in cylinder compression values should be
under 10%.
Valve Clearance
1. Loosen the lock nut and the adjusting screw on the rocker
arm.
2. Turn the adjusting screw to adjust the valve clearance at
the top dead center
IT
.D.C) during the compression
stroke of the piston.
3. Tighten the lock nut and check the valve clearance again
after several turns of the flywheel.
• NOTE:
• To get T.D.C. of the piston, find its "TC" mark on the
flywheel and align it to the punch mark on the rear end
plate (See photo).
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••
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I
Valve
Factory ,0.15toO.18mm,
l
clearance specification
I
0.0059 to 0.0071 in.
S·43