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To prevent possible injury, do not use the starter motor to turn the flywheel. Hot engine components can cause burns. Allow additional time for the engine to cool before measuring valve clearance. |
Note: The following warning should be located on the valve covers of the engine.
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Electrical shock hazard. The electronic unit injector system uses 90-120 volts. |
Perform the first valve lash check for new engines and for rebuilt engines at the first oil change. The initial wear of the valve train components and the initial seating of the valve train components causes this valve lash adjustment to be required.
Subsequent checks of the valve lash and adjustments of the valve lash are scheduled for every 3000 service hours.
Engine valve rotators should also be inspected when the valve lash is checked. See Operation and Maintenance Manual, "Engine Valve Rotators - Inspect" for the procedure.
| NOTICE |
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Operation of Caterpillar Engines with improper engine valve lash adjustments will reduce the engine efficiency. This reduced efficiency could result in excessive fuel usage and/or shortened engine component life. Measure the engine valve lash with the engine stopped. To obtain an accurate measurement, allow at least 20 minutes for the valves to cool to engine cylinder head and block temperature. |
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| Illustration 1 | g00111757 |
If the valve clearance is within
| VALVE CLEARANCE SETTING | |
| Intake | |
| Exhaust | |
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| Illustration 2 | g00514702 |
For further information on checking the engine valve lash, refer to Testing And Adjusting, SENR1018, "3408E & 3412E - Engines". Consult your Caterpillar dealer for any additional information.