RETAINER 6D8738 - Caterpillar

To prevent possible injury, do not use the starter to turn the flywheel. Hot engine components can cause burns. Allow additional time for the engine to cool before measuring valve clearance.
Valve Lash Setting
The valve lash setting is for a cold engine.Valve lash setting Inlet valve ... 0.2 0.05 mm (0.008 0.0020 inch)Exhaust valve ... 0.2 0.05 mm (0.008 0.0020 inch)Valve Lash Adjustment
If the valve lash requires adjustment several times in a short time period, excessive wear exists in a different part of the engine. Repair the problem in order to prevent more damage to the engine.Not enough valve lash can be the cause of rapid wear of the camshaft and valve lifters. Not enough valve lash can indicate that the seats for the valves are worn.Valves become worn due to the following causes:
Incorrect operation of fuel injectors
Excessive dirt and oil are present on the filters for the inlet air.
Incorrect fuel settings on the fuel injection pump.
The load capacity of the engine is frequently 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 Three Cylinder Engines
Ensure that this valve lash adjustment procedure is followed for the three cylinder engine. Do not use the traditional opposing cylinders method. Failure to follow the correct procedure may result in serious engine damage.
Firing order for the three cylinder engine ... 1, 2, 3
Illustration 1 g03340757
A typical example of the crankshaft pulley and front housing
Illustration 2 g03340758
Top center markings for the Crankshaft pulley
Rotate the crankshaft clockwise until the piston of No. 1 cylinder is at the top center position on the compression stroke. Refer to Systems Operation, Testing and Adjusting, "Finding Top Center Position for No. 1 Piston" for the correct procedure. Ensure that the "Top" mark (3) on the timing case aligns with "Dot" (4) on the crankshaft pulley.
Check the valve lash of the inlet valve of No. 1 cylinder and the exhaust valve of No. 1 cylinder. If necessary, make adjustment.
Loosen the valve adjustment screw locknut that is on