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

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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