Measuring Injector Timing.

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FIGURE 3-27. Injection Timing Tool.

TM-55-1905-223-24-3 Ship s Service Generator for Landing Craft Utility (LCU) NSN 1905-01-154-1191 Manual

FIGURE 3-28. Timing Tool Travel.

TM 55-1905-223-24-3

(h) Loosen the support bracket (2).

(i) Slide the bracket down until the push rod adapter (4) engages the push rod. Then, compress the

tension spring (7) for the adapter approximately 0.50 inch (12.7 mm).

(j) Tighten the support bracket. Ensure the support bracket is aligned with the vertical line on the clamp

handle bracket, and the push rod is aligned vertically with the plunger rod.

(k) Rotate the crankshaft in the direction of engine rotation to the Top Dead Center (TDC) position (1,

Figure 3-28) of the compression stroke for the No. 1 cylinder.

(1)

Loosen the thumbscrew for the piston travel gauge. Move the gauge so that the stem of the gauge is

in the center of the piston plunger rod.

(m) Lower the gauge against the piston plunger rod until the stem is fully compressed, then raise the

gauge approximately 0.025 inch (0.63 mm).

(n) Tighten the thumbscrew to hold the gauge in position.

(o) Rotate the crankshaft 2 or 3 degrees clockwise and counterclockwise to make sure the piston is at

TDC on compression stroke.

(p) Loosen the setscrew for the gauge dial and turn the dial so that the indicator is at zero. Tighten the

setscrew.

NOTE

Each gauge for the timing tool has a total travel of 1.0 inch. One revolution of the

indicator needle equals 0.1 inch travel of the indicator stem. When the stem of the

gauge is compressed, the indicator turns clockwise and the revolution counter turns

counterclockwise. Be sure to note the reading on the revolution counter at TDC.

This will help you find 0.2032 inch Before Top Dead Center (BTDC).

(q) Rotate the crankshaft in the direction of engine rotation to 90 degrees After Top Dead Center (ATDC)

NOTE

The piston rod travel gauge will be at the "NH/NT 90-degree" mark on the timing tool.

(r) Loosen the thumbscrew for the push rod travel gauge.

(s) Move the gauge so that the stem of the gauge is in the center of the push rod adapter.

(t)

Lower the gauge against the adapter until the stem is fully compressed.

Then raise the gauge

approximately 0.025 inch (0.63 mm).

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