3-3
Chapter 3 OPERATION
Priming Pump Tightening Method
1. Gently tighten the priming pump by hand, and
make a mark indicating the seating position.
2. Using a wrench or another appropriate tool, further
tighten the priming pump by 90±10°.
3. Check the mounting position of head packing.
Note: If the head packing has abnormality such as de-
formation or scratches, the priming pump should
be replaced. Consult a dealer of Mitsubishi
Heavy Industries, Ltd. for replacement of the
priming pump.
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.
Position where
the sheet has
been seated.
Head section can be
damaged when
overtightened
90 ±10°
Head packing
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