Fig. 3-4 Priming Pump Tightening Method; Fig. 3-5 Priming Pump Head Packing - Mitsubishi S16R-Y1PTA Operation & Maintenance Manual

Priming pump tightening method
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.
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.
90 ± 10°
Hand-tightening
becomes suddenly
heavy

Fig. 3-4 Priming pump tightening method

Head packing

Fig. 3-5 Priming pump head packing

Chapter 3 OPERATION
Priming pump
Head section can be
damaged when
overtightened
(120° or more)
3-3