Cub Cadet Yanmar 3TNV72 - Manual (Page 183)

FUEL SYSTEM
7-22 TNV IDI Service Manual
Checking and Adjusting Fuel Injection Timing
Note: As the injection pump injects fuel to a
cylinder only once every two engine
revolutions, it may be necessary to rotate
the crankshaft twice to see fuel being
pumped from the timing tool or delivery
valve of the cylinder you are using to
check injection timing.
13. Install the “spill-timing” tool (Figure 7-28, (1))
onto the delivery valve for the cylinder being
checked. See Measuring Instruments on
page 7-8.
Note: If a timing tool is not available, timing can
be checked by watching the fuel in the
delivery valve itself.
Figure 7-28
Note: The following references to the direction
of rotation are made facing the cooling
fan end of the engine and are adjusted
by turning the crankshaft.
14. Slowly rotate the crankshaft clockwise using a
wrench on the crankshaft pulley bolt until fuel is
pumped from the nozzle of the “spill-timing” tool
or delivery valve.
15. Slowly rotate the crankshaft clockwise
approximately two more revolutions until the
timing grid on the flywheel (for the cylinder
being checked) is at approximately 30° BTDC.
Note: The fuel injection pump injects fuel to a
cylinder only once every two engine
revolutions.
16. “Flick” the nozzle of the timing tool with a finger
to remove bubbles and establish a fuel level of
approximately 1/2 the height of the nozzle.
17. Very slowly rotate the crankshaft clockwise until
the fuel level in the nozzle of the “spill timing”
tool, or in the delivery valve, just begins to
move. Immediately stop rotating the crankshaft.
18. Check the position of the flywheel target timing
mark (Figure 7-27, (1)) on the flywheel grid in
relation to the timing reference mark
(Figure 7-27, (2)) on the flywheel housing or
back plate. If the two marks are aligned, the fuel
injection timing is correct. If the marks do not
align, the fuel injection timing must be adjusted.
See Adjusting Fuel Injection Timing on
page 7-23.
19. Repeat Steps 13-17 two or three times to verify
timing.
20. Remove the “spill-timing” tool.
21. Reinstall the shut-off solenoid.
22. Reinstall the high-pressure fuel injection lines.
See Installation of High-Pressure Fuel Injection
Lines on page 7-12.
23. Replace the flywheel inspection port cover.
24. Prime the fuel system. Operate the engine and
check for leaks.
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