Midwest Fuel Injection
Caterpillar 3406 B
CHECKING ENGINE TIMING BY TIMING PIN METHOD
 

Tools Needed
9S9082 Engine Turning Tool 1
6V4186 Timing Pin 1
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1. Put No. 1 piston at top center of the compression stroke.  Make reference to Finding Top Center Compression Position For No. 1 Piston.  Remove the timing bolt from the flywheel and use 9S9082 Engine Turning Too to rotate the crankshaft clockwise 45° as seen from the flywheel end of the engine.
2. Remove plug (1) from the fuel injection pump housing
3. Install 6V186 Timing Pin (2) in the fuel injection pump housing as shown.  Slowly rotate the crankshaft counterclockwise (as seen from the flywheel end of the engine) until timing pin (2) goes into the slot in the fuel pump camshaft.

NOTICE: Too much pressure on the timing pin can damage the fuel injection pump or the timing pin.
4. Put the timing bolt in the timing hole in the flywheel housing.  Rotate the crankshaft counterclockwise (as seen from the flywheel end of the engine) until the fuel pump camshaft is tight against timing pin (2).  This removes gear clearance from the drive train.  If the bolt can be installed in the timing hole in the flywheel, the timing of the fuel injection is correct.
5. If the timing bolt does not go into the timing hole in the flywheel, the timing is not correct. Do the steps that follow to adjust the fuel injection pump timing.
a) Remove cover (3).
b) Loosen four bolts (4).  With timing pin (2) installed and the timing bolt removed, turn the flywheel clockwise (opposite the direction of engine rotation) a minimum of 45°.  The reason for this step is to remove play from the timing gears when the engine is put on top center (TC).
c) Tighten two bolts (4) 180° apart, evenly to a torque of 3 N*m (27 lb in).  This puts a slight clamping force on the gear for the next step.
d) Turn the flywheel slowly in the direction of engine rotation until the timing bolt can be installed in the flywheel.  The number one piston is now at top center (TC).
e) Tighten four bolts (4) to a troupe of 55 +- 7 N*m (41 +- 5 lb ft).  Remove the timing bolt from the flywheel and timing pin (2) from the fuel injection pump housing.
6. Turn the flywheel clockwise (opposite the direction of normal engine rotation) a minimum of 45°.  Now turn the flywheel in the direction of engine rotation until timing pin (2) drops into slot of pump camshaft.  Now turn the flywheel more, in the direction of normal engine rotation, until all gear clearance is removed from the drive train.  Check to see that the timing bolt will go into the flywheel.
7. If the timing is not correct, do the procedure of steps 5b through 5e again.
8. If the timing is correct, remove the timing bolt from the flywheel and timing pin from the fuel injection pump housing.  Install cover (3) and plug (1).