Yanmar 3TNV82A-B Service Manual page 280

FUEL SYSTEM
2. Place the fuel injector in a soft-jawed vise with
the nozzle pointing up.
3. Remove the nozzle case nut.
4. Carefully remove the injector from the vise.
5. Turn the injector over and remove the nozzle
body, nozzle valve, valve stop spacer, nozzle
spring seat, nozzle spring, and shims.
6. Inspect the sealing surfaces (Figure 7-56, (2))
between the valve stop spacer and nozzle body
for nicks or scratches. Check the contact area
between the valve stop spacer and the nozzle
valve (Figure 7-56, (1)) for scoring, or pitting.
Use a magnifier glass to inspect the area.
(1)
(2)
Figure 7-56
7. Perform a nozzle valve slide test:
(a) Wash nozzle body and valve in clean diesel
fuel.
(b) While holding the nozzle body vertical, pull
the nozzle valve about 2/3 of the way out
(Figure 7-57).
(c) Release the valve. It should fall smoothly to
its seat by it's own weight.
7-40
0001333A
Figure 7-57
8. Replace the fuel injector assembly if it fails any
inspection.
TNV DI Service Manual
Fuel Injectors
0001332A