15-8
140-3 SERIES
TESTING AND ADJUSTING CYLINDER HEAD
PRESSURE TEST
• When corrections have been made around the
cylinder head, test the pressure as follows.
Special tools
1. Water pressure test
1) Assemble tool A and tool B, and connect
the hose to flange (1).
2) Apply water pressure (0.34 – 0.39 MPa {3.5
– 4.0 kg/cm
2
}) for approx. 10 minutes, and
check that there is no leakage from around
the cylinder head.
When carrying out this test, heat the whole
cylinder head and carry out the test with hot
water (80 – 95°C).
2. Air pressure test
1) Connect the compressor hose to flange (1).
2) Put the head in the container of water, apply
air pressure (0.29 – 0.34 MPa {3.0 – 3.5 kg/
cm
2
}) for approx. 30 seconds, and check
that there is no leakage in the water.
If the above test shows any cracks around the
plate plugs, replace the cylinder head.
No. Part No. Part Name Q’ty
A 790-553-1600 Coolant tester kit 1
B 79A-471-1050 Pump assembly 1
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