C4.4 Industrial Engine Engine Valve Lash - Inspect Caterpillar


Engine Valve Lash - Inspect
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1.1. Valve Lash Check

Table 1
Required Tools 
Tool  Part Number  Part Description  Qty 
A(1)  9U-6198  Crankshaft Turning Tool 
A(2)  5P-7306  Housing 
5P-7305 Engine Turning Tool 
136-4632  Timing Pin (Crankshaft) 
(1) The Crankshaft Turning Tool is used on the front pulley.
(2) This Tool is used in the aperture for the electric starting motor.


Illustration 1g01335181
Cylinder and valve location
(A) Exhaust valve
(B) Inlet valve

Too much valve lash can cause some broken valve stems, springs, and spring retainers. Damage to the valve mechanism will produce emissions in excess of the correct specification.

The hydraulic lifter will compensate for all normal wear of the components of the valve train.

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 lash

  • Issues with the hydraulic lifters

If the camshaft and valve lifters show rapid wear, look for fuel in the lubrication oil or dirty lubrication oil as a possible cause.

Valve Lash Check

------ WARNING! ------

Accidental engine starting can cause injury or death to personnel.

To prevent accidental engine starting, turn the ignition switch to the OFF position and place a do not operate tag at the ignition switch location.


  1. Remove the valve mechanism cover. Refer to Disassembly and Assembly, "Valve Mechanism Cover - Remove and Install" for the correct procedure.


    Illustration 2g01958182
    Typical example

  2. Remove the plug (1) from the cylinder block. Use Tooling (A) to rotate the crankshaft until the number one piston is at the top center position.

    Note: The number one piston may be on the compression stroke or the exhaust stroke.

  3. Install Tooling (B) into the hole (X) in the cylinder block. Use Tooling (B) in order to locate the crankshaft in the correct position.

    Note: Do not use excessive force to install Tooling (B). Do not use Tooling (B) to hold the crankshaft during repairs.

  4. Check the rocker arms for an engine valve lash. There should be no engine valve lash.


    Illustration 3g02333215
    Typical example
    One electronic unit injector is not shown for clarity.

  5. If there is an engine valve lash at any position the engine valve lash may be caused by a normal leakdown of the hydraulic lifter. Push the affected rocker arm (1) against the pushrod. The rocker arm (1) should rotate as the pushrod is pushed up by the recovery of the hydraulic lifter. Once all motion has ceased test again for an engine valve lash. There should be no engine valve lash.

  6. Remove Tooling (B) from the crankshaft. Use Tooling (A) to rotate the crankshaft in a clockwise direction. The crankshaft should be rotated 360 degrees. Install Tooling (B) to the crankshaft.

  7. Check the rocker arms for an engine valve lash. There should be no engine valve lash.

  8. If there is an engine valve lash at any position the engine valve lash may be caused by a normal leakdown of the hydraulic lifter. Push the affected rocker arm (1) against the pushrod. Monitor the rocker arm (1) for movement. The rocker arm (1) should rotate as the pushrod is pushed up by the recovery of the hydraulic lifter. Once all motion has ceased test again for an engine valve lash. There should be no engine valve lash.

  9. If an engine valve lash is found in any position, examine the valve mechanism components for excessive wear or damage. This includes the hydraulic lifters.

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