PLATE 1107670 - Caterpillar

Illustration 4 g00311262
Valve lash adjustment
Lift up firmly on the valve end of the rocker arm. Turn the valve adjusting screw until you achieve the setting that is specified in Table 4.
Table 4
Valve Lash Setting With Engine
Valves Indicator Reading
Inlet 0.50 mm (0.020 inch)
Exhaust 1.27 mm (0.050 inch)
Try to move the rocker arm for a small amount while you lift the rocker arm. The dial indicator reading will vary. Read the dial indicator when the rocker arm fits in the groove for the rocker arm.
Illustration 5 g00801889
Tightening the locknut
(B) 1U-7133 Socket and 5P-0333 Wrench
Fit the 1U-7133 Socket and 5P-0333 Wrench (B) over the locknut. Insert a screwdriver through the socket and hold the adjusting screw in position. Fit a torque wrench onto the 5P-0333 Wrench and tighten the locknut to a torque of 200 25 N m (150 18 lb ft). Check the adjustment 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 normal crankshaft rotation. This will put No. 1 piston at Top Center Exhaust Stroke. Install the timing pin. Complete the adjustments for the remaining cylinders.Gas Admission Valve Lash
Table 5
Required Tools Qty
146-2742 Gas Inlet Valve Test Tool(1) 1
6V-3075 Dial Indicator(1) 1
8S-3675 Indicator Contact Point(1) 1
(1) Insert the contact point into the dial indicator. Insert the dial indicator into the test tool. Tighten the retaining screw finger tight.
Put the No. 1 piston at the Top Center position. Refer to Testing and Adjusting, "Finding the Top Center Position for the No. 1 Cylinder" and Testing and Adjusting, "Crankshaft Position for Valve Lash Setting". Work on the appropriate cylinders.
Illustration 6 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 in order to indicate the maximum lash.
Illustration 7 g00500316
Lifting the rocker arm
Lift the end of the rocker arm that has the adjusting screw. Zero the dial indicator.
Illustration 8 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's rocker arm. Read the dial indicator. The correct setting is listed in Table 6.
Table 6
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's 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