Yanmar 6CXM-GTE, Service Manual

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2) Suction test for the priming pump
Loosen the handle of the priming pump, and push the
handle at 60 - 100 strokes/minute.
If fuel comes out of the delivery side of the feed pump
after about 25 strokes, the priming pump is normal. If
it takes longer, replace the priming pump as a set.
3) Delivery pressure test
The special equipment is necessary to perform deliv-
ery pressure and delivery volume test.
Operate the injection pump at the specified rpm, and
read the pressure gauge indicator when valve B is
tightened completely. Tighten the valve A so that the
pressure gauge indicator does not move when the pres-
sure is applied.
Replace the piston spring if it is defective.
4) Delivery volume test
Operate the fuel injection pump at the specified rpm,
open valve B until the pressure gauge indicator shows
0.098 MPa (1kgf/cm
2 ), and measure the delivery rate
for one minute.
Suction head 1 m
Within 25 strokes
Suction pipe dia. Ǿ
13
Note:
Do not run the equipment for more than 5 min-
utes since the fuel injection pump may be dam-
aged if operated in non-injection condition.
Delivery pressure
0.40
㨪
0.55MPa (4.1
㨪
5.6 kgf/
cm 2
)
Pump rpm 600
Delivery volume > 4.8
"
/min
Back pressure
0.098 MPa (1 kgf/
cm 2
)
Pump rpm 1000