HEAD 7J3351 - Caterpillar

Adjustment of the Speed-Timing Wheel
Illustration 1 g03800721
In-line engine
Position of the speed-timing wheel with the number one cylinder at the top center position on the compression stroke
(1) Arrow for the direction of the camshaft rotation
(2) Spacer
(3) Engine speed/timing sensor (Tertiary)
(4) Extra tooth
(5) Engine speed/timing sensor (Secondary)
Illustration 2 g03800727
Vee engine
Position of the speed-timing wheel with the number one cylinder at the top center position on the compression stroke
(1) Arrow for the direction of the camshaft rotation
(3) Engine speed/timing sensor (Tertiary)
(4) Extra tooth
(5) Engine speed/timing sensor (Secondary)
Put the No. 1 piston at the Top Center position on the compression stroke. Refer to Testing and Adjusting, "Finding The Top Center Compression Position For the No. 1 Cylinder" and Testing and Adjusting, "Crankshaft Position for Valve Lash Setting". Pin the camshaft.
Orient one of the camshaft drive gear's 1/2-13 threaded holes to the 12 o'clock position. The four 1/2-13 threaded holes form a diamond pattern.
Install spacer (2) and the speed-timing wheel. Orient extra tooth (3) near sensor (4). Loosely install the four bolts in order to enable speed-timing wheel to be moved.
Rotate the speed-timing wheel in the direction of the camshaft rotation. Rotate the wheel until the first tooth after the extra tooth is aligned with the centerline of the sensor.
Tighten the four bolts.
Install the cover for the speed-timing wheel.
Remove the camshaft timing pin from the camshaft. Install the timing pin in the storage position. Adjusting the Engine Speed/Timing Sensor
Illustration 3 g03790096
G3606 and G3608
(1) Engine speed/timing sensor (Tertiary)
(2) Engine speed/timing sensor (Secondary)
(3) Engine speed/timing sensor (Primary)
Illustration 4 g03790097
G3612 and G3616
(1) Engine speed/timing sensor (Tertiary)
(2) Engine speed/timing sensor (Secondary)
(3) Engine speed/timing sensor (Primary)
Illustration 5 g03790297
Engine speed/timing sensor (Secondary and Tertiary)
(4) Bracket
(5) O-ring seal
(6) Sensor
(7) Terminal 1 for the - signal
(8) Terminal 2 for the + signal
Illustration 6 g03790342
Engine speed/timing sensor (Primary)
(9) Terminal A for the supply voltage
(10) Terminal B for the ground
(11) Terminal C for the signal
(12) O-ring seal
(13) Sensor Note: The primary speed sensor is mounted in a plate that is on the back of the right cam cover that is doweled and is not adjustable.
Clean the tip of the primary sensor (3) and the counterbore for the sensor in the mounting plate.
Lubricate O-ring seal (12) with clean engine oil.
Install the sensor into the counterbore in the mounting plate. Make sure that the sensor is properly seated. Tighten sensor ... 40 5 N m (30 4 lb ft)
Measure the gap between the sensor head and the flywheel. The distance must not exceed 4 mm (0.157 inch).
Clean the tip of the tertiary sensor (1), the secondary sensor (2), the sensor mounting flange, and the counterbore for the sensor in the rear housing.
Lubricate O-ring seals (5) with clean engine oil.
Install the sensor into the counterbore in the rear housing. Make sure that the sensor is properly seated and that the bracket is flush with the mounting surface. Use the bolt to secure the bracket to the rear housing.
Measure the gap between the sensor head and the first tooth after the extra tooth on the timing wheel. The distance must be