D346 MARINE ENGINE Caterpillar

Starting System


Air Starting

The motor oiler lubricates the vanes of the starting motor with a fine oil mist as the motor is operating.

The collector jar collects both the oil after it has lubricated the starting motor vanes, and the moisture condensation from the compressed air. Empty the collector jar whenever the jar becomes half full.


When the oiler jar becomes half empty, remove the oil filler plug and fill the jar with clean oil. Refer to Lubrication and Maintenance Chart for proper oil.



Never allow the jar to become empty. The starting motor will be damaged by lack of proper lubrication.

Adjusting The Air Starting Motor Oiler Feed

If necessary, adjust the oiler to release approximately four drops of oil per minute into the starting motor air stream.

1. Move the compression release lever to the START position, and move the governor control lever to the SHUT-OFF position.
2. Pull up on the air start control lever and crank the engine.
3. Count the drops of oil released per minute into the air stream.
a. Turn the valve needle (the uppermost knob on the oiler) counterclockwise to increase the number of drops.
b. Turn the valve needle clockwise to decrease the number of drops.


Back to top
The names Caterpillar, John Deere, JD, JCB, Hyundai or any other original equipment manufacturers are registered trademarks of the respective original equipment manufacturers. All names, descriptions, numbers and symbols are used for reference purposes only.
CH-Part.com is in no way associated with any of the manufacturers we have listed. All manufacturer's names and descriptions are for reference only.