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 TM 55-1905-219-14-6
3-166.2. ENGINE TIMING - MAINTENANCE INSTRUCTIONS (Continued).
(6) Select a dial indicator with .001 inch graduations and with a spindle movement of at least 1 inch. Use
suitable mounting attachments for the indicator so that it can be mounted over the injector hole in the cylinder
head. Provide an extension for the spindle of the indicator. The extension must be long enough to contact the
piston as it approaches its upper position.
(7) Mount the indicator over the injector hole and tighten the mountings sufficiently to hold the indicator
rigid. The mounting leg may be threaded into the rocker cover stud, or the stud may be removed from the
cylinder head and the leg threaded into the tapped hole, depending upon the length of the rod used in making
up the mounting attachments. Make sure the spindle extension is free in the injector hole, that it does not bind,
and that it is free to travel its full 1 inch movement.
(8) Provide a suitable pointer and attach it to the engine front end plate. The pointer should extend over
the vibration dampener, or crankshaft pulley.
(9) Rotate the crankshaft in the direction of rotation slowly until the hand on the dial indicator stops
moving.
(10) Rotate the crankshaft in the direction of rotation until the indicator hand starts to move. Reset the
dial to "0". Continue turning the crankshaft slowly until the indicator reading is .010 inch - then stop turning.
(11) Scribe a line on the dampener in line with the end of the pointer.
(12) Rotate the crankshaft slowly in the opposite direction of rotation until the hand on the dial indicator
just stops moving.
3-2830
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