FUEL SYSTEM
7-30
TNV DI Service Manual
Checking and Adjusting Fuel Injection Timing
16. Prime the fuel system. See Priming the Fuel
17. Operate the engine and check for fuel and
coolant leaks.
CHECKING AND ADJUSTING
FUEL INJECTION TIMING
Determining the Fuel Injection Timing
Specification
1. Locate and record the fuel injection pump
timing index number (Figure 7-37, (1)) stamped
into the boss on the engine side of the fuel
injection pump housing (Figure 7-36, (1)). Treat
this number as though there is a decimal point
between the two digits. i.e. 68 = 6.8
Figure 7-36
Figure 7-37
2. Using the FIR number for the engine being
serviced use the Fuel Injection Reference (FIR)
Chart under “FIE Specs” on the Yanmar
Distributor Website
(http://distributor.yanmar.co.jp).
The FIR number is determined by the complete
engine model number. The engine model
number is located on the engine nameplate
(Figure 7-38).
Figure 7-38
EXAMPLE: The following example is for an engine
model 3TNV82A-DSA.
• Find the engine model number in the FIR chart.
Locate and record the FIR number (The FIR
number for this engine is 4).
• Insert the numbers you have recorded into the
following equation:
(Fuel Injection Pump Timing Index Number X 2)
+ FIR Number = FIT° (Fuel injection Timing in
Degrees)
(6.8 X 2) = 13.6 + 4 = 17.6° Fuel injection
Timing
• Record the calculated fuel injection timing
specification.
0000040B
(1)
0002047
(1)
0003852
TNV_DI_SM_A4.book 30 ページ ２００７年１２月６日 木曜日 午前９時２３分
