FUEL SYSTEM
TNV DI Service Manual
7-31
Checking and Adjusting Fuel Injection Timing
Checking Fuel Injection Timing
Note: Some fuel may drain from the fuel
injection pump during this process. Make
provisions to contain any such spillage.
1. Turn off the fuel valve in the fuel supply hose
and the fuel return hose.
2. Clamp shut the fuel injection pump fuel return
hose leading to fuel filter (Figure 7-39, (1)).
Figure 7-39
IMPORTANT
Clean the top of the fuel injection pump to
prevent any contamination when the fuel
injection pump plunger plug is removed.
3. Remove the forward fuel injection pump plunger
plug (Figure 7-39, (2)) on the top of the fuel
injection pump.
4. Install a dial indicator adapter and clamp into
the pump plunger opening.
Note: Use the Yanmar part no. 158090-51831
M14 adapter for the MP2 fuel injection
pumps (TNV82 - 88 model engines) or
Yanmar part no. 158090-51841 for the
M16 adapter used on the MP4 fuel
injection pumps (TNV94 - 106 model
engines) and Yanmar part no. 23000-
013000 plunger adapter clamp
(Figure 7-40, (1)).
Figure 7-40
5. Install a dial indicator (Figure 7-41, (1)),
Mitutoyo No. 2050SB or equivalent, with a
30 mm extension, Yanmar part no.
158090-51870 or Mitutoyo No. 303613, into the
adapter. Secure with the Yanmar part no.
23000-013000 plunger adapter clamp
(Figure 7-40, (1)) at approximately the mid-
point of its travel.
0002087
(1)
(2)
0002068A
(1)
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