Cub Cadet Yanmar 3TNV72 - Manual (Page 182)

FUEL SYSTEM
TNV IDI Service Manual 7-21
Checking and Adjusting Fuel Injection Timing
• EXAMPLE: If the distance between the two
“longer” marks is approximately 2.0 cm and the
distance from the TDC mark is approximately
4.0 cm, the answer is approximately 2. This
indicates there is 10° (2 x 5°) between the TDC
mark and the first “longer” mark on the timing
grid. That means the first “longer” mark on the
timing grid indicates 10° BTDC, the second
“longer” mark indicates 15° BTDC and the third
timing mark indicates 20°. If the answer is 3,
that indicates there is 15° (3 x 15°) between
the TDC mark and the first “longer” mark and
that the first “longer” mark indicates 15° BTDC
with the second and third “longer” marks
indicating 20° BTDC and 25° BTDC
respectively.
9. Highlight the timing reference mark on the
flywheel housing (Figure 7-25, (2)) or engine
back plate (Figure 7-26, (2)). Highlight the TDC
(Top Dead Center) mark (Figure 7-25, (1)),
(Figure 7-26, (1)) on the flywheel.
Figure 7-25
Figure 7-26
10. Highlight the target timing mark
(Figure 7-26, (1)), (Figure 7-27, (1)) on the
flywheel timing grid as determined in the Fuel
Injection Timing Chart below.
Figure 7-27
Fuel Injection Timing Chart
11. Remove all high-pressure fuel injection lines.
See Removal of High-Pressure Fuel Injection
Lines on page 7-11.
12. Turn on all fuel supply valves.
1
0002065A
(2)
(1)
0002142
(2)
(1)
0002066
(2)
(1)
Model VH
Engine Speed (rpm) 3300
3TNV72 Injection Timing BTDC ±1° 19°
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