Cub-cadet Yanmar 3TNV72 User Manual download pdf (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.

0000592A

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