C4.4 Industrial Engine Engine Valve Lash

Engine Valve Lash - Inspect

C4.4 Industrial Engine [KENR9119]

C4.4 Industrial Engine Engine Oil Cooler - Inspect

C4.4 Industrial Engine Air Inlet and Exhaust System - Series Turbochargers

BASIC ENGINE

VALVE MECHANISM GP

C4.4 Industrial Engine Valve Depth - Inspect

C4.4 Industrial Engine Engine Valve Lash - Inspect

C4.4 Industrial Engine Position the Valve Mechanism Before Maintenance Procedures

C4.4 Industrial Engine Finding Top Center Position for No. 1 Piston

1.1. Valve Lash Check

Show/hide table

Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A⁽¹⁾	9U-6198	Crankshaft Turning Tool	1
A⁽²⁾	5P-7306	Housing	1
A⁽²⁾	5P-7305	Engine Turning Tool	1
B	136-4632	Timing Pin (Crankshaft)	1

Show/hide table

⁽¹⁾	The Crankshaft Turning Tool is used on the front pulley.
⁽²⁾	This Tool is used in the aperture for the electric starting motor.

Show/hide table




Illustration 1	g01335181
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

Show/hide table

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.

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

Illustration 2 g01958182

Typical example
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.
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.
Check the rocker arms for an engine valve lash. There should be no engine valve lash.
Show/hide table

Illustration 3 g02333215

Typical example
One electronic unit injector is not shown for clarity.
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.
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.
Check the rocker arms for an engine valve lash. There should be no engine valve lash.
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.
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.