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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. |
The initial valve lash adjustment for new engines and for rebuilt engines is scheduled at the First 250 Service Hours.
Check and adjust the valve lash at every 3000 service hours.
Check the valve bridge before setting the valve lash. Ensure that the valve bridge is seated equally on both valve stems.
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Operation of Caterpillar engines with improper valve adjustments will reduce engine efficiency. This reduced efficiency could result in excessive fuel usage and/or shortened engine component life. |
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Electrical shock hazard. The electronic unit injector system uses 90-120 volts. |
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Measure the valve clearance with the engine stopped. To obtain an accurate measurement, allow at least 20 minutes for the valves to cool to engine cylinder head and engine block temperature. |
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| Illustration 1 | g00039668 |
If the valve clearance settings are within
| VALVE CLEARANCE SETTING CHART | |
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| Intake Valve | |
| Exhaust Valve | |
Refer to your machine's Service Manual or your Caterpillar dealer for the complete valve adjustment procedure.
The valve rotators should be inspected before the valve cover is installed. Refer to Operation and Maintenance Manual, "Engine Valve Rotators - Inspect".