1693 DIESEL TRUCK ENGINE Caterpillar


Variable Timing Unit

Usage:

Disassemble Variable Timing Unit

start by:

a) remove variable timing unit

1. Push down on retainer (1) and remove pin (2).

2. Remove retainer (1) and spring (3).

3. Push out pins (4) and remove the weights.

4. Remove piston and rod assembly (5).

5. Remove pins (11), rod (9) and nut (8).

6. Remove spring (10) and valve (7) from piston assembly (6).

Assemble Variable Timing Unit

1. Install valve (3), spring (4) and nut (2) on piston assembly (1).

2. Tighten nut (2) until the distance (X) between inner surface of nut (2) and piston (1) is 1.708 in. (43.38 mm) for 8S5115 Assembly and 1.863 in. (47.32 mm) for 4N4788 Assembly. Make a .095 ± .002 in. (2.41 ± 0.05 mm) diameter hole through the nut and threaded part of piston assembly. Install the pin.

3. Install rod (6) and tighten it against nut (2). Put a location mark on rod (6) .156 in. (3.96 mm) from outer surface of nut (2). Make a .095 ± .002 in. (2.41 ± 0.05 mm) diameter hole (5) through the rod and threaded part of piston assembly. Install the pin.

4. Install piston and rod assembly (7) into the shaft assembly.

5. Install spring (8), retainer (9) and pin (10) in shaft assembly.

6. Install weights and pins. Put a center punch mark at edge of each hole in shaft assembly to hold pins in shaft (stake pins in place).

NOTE: Each weight must move freely on its pin.

end by:

a) install variable timing unit

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