Yanmar 3TNV Series, Service Manual

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2. Inspection and Adjustment
7) Adjust the injection angle difference, calculated in
the above 5), at 0.25 in the unit in the
installation angle of the fuel pump while reading
the mark (minimum 0.5 and cam angle) of the
adjustment sticker.
[NOTICE]
Push down the fuel pump in the outside direction of
the cylinder block at +1 degree when a injection
angle difference is +1 degree. And, push it down to
the cylinder block side when a difference is –1
degree.
8) Tighten the fuel pump installation nuts.
(Supplementary explanation 1)
The installation angle of the fuel pump is as follows.
Model
Installation angle
(deg.)
3TNV82A TNV88 25
4TNV94L/98/106(T) 13
4TNV106(T) 11.5
(Supplementary explanation 2)
When fuel injection timing is advanced or delayed,
the installation angle of the fuel pump is adjusted.
When fuel injection timing is advanced for example at
2 degrees, loosen the nuts, which fix the fuel pump
on the gear case, and turn the fuel pump body in the
outside direction of the cylinder block at 1 degree,
and tighten the pump installation nuts.
And, when fuel injection timing is delayed, a pump is
turned in that reverse direction.
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