GRAPPLE AR-MECHANICAL 1695302 - Caterpillar

Put the No. 1 piston at the Top Center position. Refer to "Finding the Top Center Compression Position for the No. 1 Cylinder" and "Crankshaft Positions for Valve Lash Setting". Work on the appropriate cylinders.
Illustration 21 g00801911
(1) Counterbore
(A) 146-2742 Gas Inlet Valve Test Tool
Install 146-2742 Gas Inlet Valve Test Tool (A) onto the rocker base. Align the point of the dial indicator into the center of counterbore (1).Note: Make sure that the rocker arm is pressed to the left to indicate the maximum lash.
Illustration 22 g00500316
Lifting the rocker arm
Lift the end of the rocker arm that has the adjusting screw. Zero the dial indicator.
Illustration 23 g00500317
Adjusting the gas admission valve lash
Rotate the rocker arm away from the upper pushrod and push the rocker arm toward the exhaust valve rocker arm. Read the dial indicator. The correct setting is listed in Table 11.
Table 11
Valve Lash Setting With Engine Stopped
Valve Indicator Reading
Gas admission valve 0.64 mm (.025 inch) If the valve lash is correct, go to Step 6.If the valve lash is not correct, loosen the locknut for the adjusting screw. Rotate the rocker arm away from the upper pushrod and push the rocker arm toward the exhaust valve rocker arm. Turn the adjusting screw until the correct valve lash is obtained.
Tighten the locknut for the adjusting screw to a torque of 30 4 N m (22 3 lb ft). Check the valve lash again. Repeat the procedure, if necessary.
Perform the procedure for the remaining valves.
After all valves are adjusted for the Top Center Compression Stroke, remove the crankshaft timing pin. Operate the prelube pump and rotate the flywheel for 360 degrees in the direction of the normal crankshaft rotation. The rotation will put the No. 1 piston at the Top Center Exhaust Stroke. Install the timing pin. Complete the adjustments for the remaining cylinders.Adjustment of the Speed-Timing Wheel
Illustration 24 g00896580
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) Extra tooth
(4) Engine speed/timing sensor
Illustration 25 g00896582
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
(2) Spacer
(3) Extra tooth
(4) Engine speed/timing sensor
Put the No. 1 piston at the Top Center position on the compression stroke. Refer to "Finding the Top Center Compression Position for the No. 1 Cylinder" and "Crankshaft Positions 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 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