Cub Cadet Yanmar 3TNV72 - Manual (Page 188)

FUEL SYSTEM
TNV IDI Service Manual 7-27
Fuel Injectors
Disassembly and Inspection of Fuel
Injectors
1. Clean carbon from used injectors using clean
diesel fuel. Hardened deposits or varnish can
be cleaned using a brass wire brush.
1 – Return Fuel Fitting Nut
2 – Return Fuel Fitting
3 – Injector Body
4 – Pressure Adjusting Shims
5 – Spring
6 – Spring Seat
7 – Valve Stop Spacer
8 – Nozzle Valve
9 – Nozzle Body
10 – Nozzle Case Nut
Figure 7-32
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 7-33, (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 7-33, (1)) for scoring or pitting.
Use a magnifying glass to inspect.
Figure 7-33
CAUTION
Never use a steel wire brush to clean
fuel injectors. Damage to the nozzle and
other components is likely to result.
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