0303304 JOHNSON WASHER, Retainer spark advance

Valve Lash-3306B Engine
Check/Adjust
Initial valve lash adjustment is recommended at the first oil change interval due to initial wear and seating of valve train components.Subsequent valve lash adjustments should be made Every 2000 Hours.This maintenance is recommended by Caterpillar as part of a lubrication and preventive maintenance schedule to provide maximum engine life.
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.Only qualified service personnel should perform this maintenance. Refer to the Service Manual or your Caterpillar dealer for the complete valve lash adjustment procedure.
Be sure the engine cannot be started while this maintenance is being performed. To prevent possible injury, do not use the starting motor to turn the flywheel.Hot engine components can cause burns. Allow additional time for the engine to cool before measuring/adjusting valve lash clearance.
Measure the valve lash with the engine stopped. In order to obtain an accurate measurement, the allow the valves to cool before performing this maintenance. Valve Rotators
When inspecting the valve rotators, protective glasses or face shield and protective clothing must be worn, to prevent being burned by hot oil or spray.
If a damaged rotator is not replaced, valve face guttering could result in pieces of the valve to fall into the cylinder. This can cause piston and cylinder head damage.
After setting the valve lash and before installing the valve covers:1. Start the engine. Follow the engine starting procedure in this manual. Operate the engine at low idle.2. Observe the top surface of each valve rotator. Each valve rotator should turn slightly each time the valve closes.If a valve fails to rotate, contact your Caterpillar dealer.Fuel Ratio Control, Set Point, and Low Idle-3306B Engine
Check/Adjust
The fuel ratio control limits the amount of fuel provided to the cylinders during acceleration. This affects the amount of exhaust smoke. The set point check is a method for diagnosing engine performance. Slow engine response and low power indicate that a fuel control adjustment or repair is necessary.These engines are equipped with a protection group that discourages tampering with the fuel ratio control setting. This is required by emissions regulations. Standard bolts have been replaced by tamper resistant bolts.The fuel ratio control, set point, and idle speed checking and adjusting should only be performed by Caterpillar authorized service personnel. Consult your Caterpillar dealer for assistance.Fuel Injection Nozzles-3306B Engine
Fuel injection nozzles are subject to tip wear. Tip wear, a result of fuel contamination, can cause:* increased fuel consumption* black smoke* misfire* rough runningThe fuel injection nozzles should be cleaned, inspected, tested, and replaced if necessary. Removal and InstallationSpecial tooling is required for removing and installing the fuel injection nozzles. Refer to the Service Manual for information. Consult your Caterpillar dealer for assistance.Test/Exchange
Fuel leaked or spilled onto hot surfaces or electrical components can cause a fire. To prevent possible injury, turn the start switch OFF when changing fuel filters or water separator elements. Clean up fuel spills immediately.
Do not allow dirt to enter the fuel system. Thoroughly clean the area around a fuel system component that will be disconnected. Fit a suitable cover over any disconnected fuel system components.
Never wire brush or scrape a fuel injection nozzle. Wire brushing or scraping a fuel injection nozzle will damage the finely machined orifice. Proper tools for cleaning and testing fuel injection nozzles can be obtained from authorized Caterpillar dealers.
Abnormal engine running, smoke emission, and engine knock can be symptoms of a fuel injection nozzle malfunction. Each fuel injection nozzle must be isolated one at a time in order to determine which fuel injection nozzle is malfunctioning.1. Start the engine.
A fuel injection nozzle will be damaged if the top of the nozzle turns in the body. The engine will be damaged if a defective fuel injection nozzle is used because the fuel spray pattern that comes out of the nozzle will be incorrect. Fuel injection nozzles can be permanently damaged by twisting if only one wrench is used to loosen or tighten the fuel line nuts. Do NOT let the tops of the fuel injection nozzles turn when the fuel lines are loosened. Use one wrench to hold the fuel injection nozzle and use another wrench to loosen the fuel line nut.
2. Loosen each fuel line nut at the fuel injection pump, one at a time. A cloth or similar material must be used to prevent the fuel from spraying on the hot exhaust components. Tighten each fuel line nut before loosening the next fuel line nut.3. A defective fuel injection nozzle may be identified when a fuel line nut is loosened and: * the exhaust smoking is partially or completely eliminated* irregular running is not affectedA fuel injection nozzle suspected of being defective should be removed. A new fuel injection nozzle should be installed in the cylinder in order to determine if the fuel injection nozzle which was removed is defective.