TRANSMISSION GP 2374546 - Caterpillar

exceeded.Too much valve lash can cause broken valve stems, springs, and spring retainers. Too much valve lash can be an indication of the following problems:
Worn camshaft and valve lifters
Worn rocker arms
Bent pushrods
Broken socket on the upper end of a pushrod
Loose adjustment screw for the valve lashIf the camshaft and valve lifters show rapid wear, look for fuel in the lubrication oil or dirty lubrication oil as a possible cause.The valve lash is measured between the top of the valve stem and the rocker arm lever.Note: No. 1 cylinder is at the front of the engine.Remove the Valve Mechanism Cover. Refer to Disassembly and Assembly, "Valve Mechanism Cover - Remove and Install".Note: During the inspection and adjustment of the valve lash, the front housing must be installed.
Accidental engine starting can cause injury or death to personnel.To prevent accidental engine starting, turn the ignition switch to the OFF position, place a do not operate tag at the ignition switch location and disconnect and tape the electrical connection to the stop solenoid that is located on the fuel injection pump.
Valve Lash Adjustment for Two Cylinder Engines
Illustration 1 g01107989
Setting the valve lash
(1) Feeler gauge
(2) Adjustment screw
Illustration 2 g01879993
Typical Example
Rotate the crankshaft in a clockwise direction until the exhaust valve for No. 1 cylinder is nearly closed and the inlet valve for No. 1 cylinder is starting to open.
Rotate the crankshaft in a clockwise direction through an additional 360 degrees and align the timing mark (4) on the crankshaft pulley with the "TOP" mark (3) on the timing case. No. 1 cylinder is now on the firing cycle. The valve lash can now be inspected and adjusted on No. 1 cylinder.
Loosen the valve adjustment screw locknut that is on adjustment screw (2).
Place the appropriate feeler gauge (1) between the rocker arm and the