0317 00 2
Start RHIB engine and run it, in gear, at idle speed for at least 3 minutes or until it reaches normal operating
temperature. (TM 55-1945-205-10-2)
Observe the way the engine idles. If the air/fuel mixture is too lean, the engine will sneeze
and backfire. If the air/fuel mixture is too rich, the engine will run
rough and unsteady.
Adjust the carburetor for too lean or too rich conditions as follows.
To adjust a carburetor that is too lean, note the reference mark and turn the idle screw (2) 1/8 revolution
Wait 15 seconds and repeat this procedure until the engine reaches the highest consistent RPM.
To adjust a carburetor that is too rich, note the reference mark and turn the idle screw (2) 1/8 turn clockwise.
Wait 15 seconds after each adjustment and repeat this procedure until you reach the highest consistent RPM.
Repeat step 3 for each carburetor.
Test the idle adjustment by running engine at a high throttle setting for 3 minutes.
Return the engine to idle while still in gear. The engine should maintain a smooth idle.
If the engine does not respond properly to these adjustments, check for the following conditions.
Check carburetor linkage adjustment. (WP 0271 00)
Check RHIB engine temperature. (TM 55-1945-205-10-2)
Verify water is being discharged from cooling system port on lower unit.
Check RHIB intake manifold balance passage. (WP 0318 00)
Shut down the engine. (TM 55-1945-205-10-2)
Install RHIB engine cover. (WP 0297 00)
END OF WORK PACKAGE