3046 Engine for Caterpillar Built Machines Fuel Injection Timing - Check - Distributor Pump Caterpillar

Improper fuel injection timing can cause poor engine performance.

Fuel injection timing ... 5° BTC

1. Remove the valve mechanism cover. Rotate the crankshaft in the normal direction of the engine rotation until the inlet valve of the rear cylinder has just opened and the exhaust valve of the rear cylinder has not completely closed.

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Illustration 1	g00565561
Turning the engine

2. Align the TC mark on the crankshaft pulley with the pointer on the timing case.

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Illustration 2	g00994700
(1) Bolt

3. Remove bolt (1) that is located at the center of the rear face of the fuel injection pump. Install the 192-3331 Timing Gauge with the 6V-3075 Dial Indicator with approximately 10 mm (0.39 inch) of preload in order to measure cam lift. Refer to Illustration 3.

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Illustration 3	g01037576
Typical example (2) Timing tools

4. Rotate the crankshaft in the opposite direction of the engine rotation until the reading on the dial indicator stabilizes at the bottom of the lift of the plunger in the pump. Set the dial indicator to zero.

   Note: The needle of the dial indicator will stop moving when the bottom of the lift of the plunger has been reached.

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Illustration 4	g01011407

5. Rotate the crankshaft in the normal direction of the engine until the 5° mark on the crankshaft pulley is aligned with the pointer on the timing case.

6. Record the reading on the dial indicator. The reading should be 0.5 mm (0.020 inch).

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Illustration 5	g00994703
Positioning the fuel injection pump

7. If the reading on the dial indicator is not within the specification, then the pump needs to be rotated. To adjust the timing of the fuel injection pump, loosen the flange nuts and move the pump in order to achieve a reading of 0.5 mm (0.020 inch).

8. With the cam lift at 0.5 mm (0.020 inch), secure the pump in position.

9. Remove timing tools (2) from the fuel injection pump.

10. Before installing bolt (1) , replace the copper gasket that is on the bolt with a new gasket. Install bolt (1) and tighten securely. Install the valve mechanism cover.