VALVE AS-BREAKER RELIEF 3589477 - Caterpillar

Engine Valve Lash
Measure Valve Lash (Clearance)
The valve clearance setting is to be made at the initial (first) oil change interval. All subsequent adjustments are to be performed at the "Every 2000 Service Hours" interval thereafter.
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.
Measure the 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.
Valve Clearance Setting
Set the clearance as given in the "Valve Clearance Setting" chart.Refer to the Service Manual or your Caterpillar dealer for the complete valve adjustment procedure. Rotate the engine crankshaft 360° in the normal crankshaft rotation direction before any adjustments are made.After setting all valve clearances and before installing the valve cover observe valve rotators.Engine Valve Rotators
Observe Rotation of Valves With Engine Idling After Setting the Valve Clearances
When inspecting the valve rotators, protective glasses or face shield and protective clothing must be worn, to prevent being burned by hot oil spray.
1. Start the engine.2. Move the governor control to low idle (600 rpm or lower) position. 3. Watch the top surface on each valve rotator. Each valve rotator should turn slightly each time the valve closes.If a valve fails to rotate, contact your Caterpillar dealer.