3-3
Chapter 3 OPERATION
Priming pump tightening method
1. Tighten the priming pump firmly by hand, and place
a mark on the priming pump.
2. Use a wrench or another appropriate tool to tighten
the priming pump 90±10°.
3. Check the mounting position of head packing.
Note: If the head packing has abnormality such as de-
formation or scratches, consult a dealer of Mit-
subishi Heavy Industries, Ltd., as the priming
pump needs to be changed.
Fig. 3-4 Priming pump tightening method
Fig. 3-5 Priming pump head packing
Never fail to tighten the priming pump to the speci-
fied angle. If the priming pump is not firmly tightened,
internal thread will be worn due to engine vibration,
resulting in sudden ejection of the cap to cause fuel
flow-out. Or if the priming pump is excessively tight-
ened, the head of the priming pump can be dam-
aged.
Hand-tightening
becomes suddenly
heavy
Head section can be
damaged when
overtightened
(120° or more)
90 ± 10°
Priming pump
Head packing
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