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 TM 5-1940-277-20
TM 1940-20/2
2.
Note wire and terminal location and using 7 mm box wrench disconnect wires (1) from
terminals (2).
3.
Using 11 mm box wrench, remove two bolts (3) and washers (4) securing tachometer sending
unit (5) to engine block.
4.
Remove tachometer sending unit (5) from engine by lifting up and out.
5.
Remove gasket (6) from engine block. Remove dirt and oil from opening.
NOTE
Do not allow dirt or debris to enter the opening. If installation of
replacement tachometer drive is to be delayed, close the opening
with clean rag or paper.
Insure mounting are on engine block is clean and paper or cloth
used to plug hole has not lodged inside.
INSTALL:
1.
Install new gasket (6) on engine block and align holes.
2.
Install new tachometer sending unit (5) to engine by inserting shaft into hole in engine block.
Insure drive flange is aligned.
3.
Align holes of tachometer sending unit (5) with holes in gasket (6) and engine block.
4.
Using 11 mm box wrench, install two mounting bolts (3) and washers (4) and tighten.
5.
Connect proper wire (1) to sanding unit terminal (2) and tighten nut (2) using 7 mm box wrench.
6.
Close engine hatches.
3-225
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