Yanmar 4LHA-HTP Operation Manual page 408

Chapter 3 Fuel Injection Equipment
9. Pump Reassembly, Adjustment and Inspection
Fig. 21
Suction inlet
663 --
Fig. 22
Blind plug
3-1-51
14. Testing Governor Lever
Assembly Movement
Position the cam in the top dead end position,
and manually check governor lever assembly
(control sleeve) movement. Perform this test
over the entire cam profile.
15. Air-tightness Test
After completion of assembly, perform an air-
tightness test as described below.
a) Tightly screw in the pump cover overflow
outlet plug (with a gasket).
b) Supply compressd air [approx.0.39MPa(4 kgf
/cm )] to the pump through the suction inlet.
2
c) Immerse the pump in light oil.
d) Check for bubbles indicating pump leakage
(particularly at the drive shaft oil seal).
16. Handling of O-Rings
a) Rubber O-rings must be stored unex-
panded.
b) When reassembling the pump after test
immersion or actual use, replace all O-rings.
, 4LHA Serie