5001371 JOHNSON ENGINE COVER ASSY. - X

Do not turn the speed control knob unless the test bench is running. Damage to the variable speed drive may result. Except in the event of an emergency, the speed control knob should always be returned to the slowest rpm setting before the calibration bench is turned off.
Turn the control knob for the governor speed counterclockwise to the slowest speed. Inspect all of the fluid connections for leakage. Perform any necessary repairs.Note: Always approach a specified rpm setting from a minimum of 100 rpm above the rpm that is required. This will ensure that the test readings are consistent for the entire test procedure.All specifications for the governor adjustment procedure are in the Technical Marketing Information (TMI). If you are checking a previously adjusted governor, the tolerance ( ) factor should be doubled. The tolerance factor should be referred to as an expanded tolerance.As an example, if a tolerance in the specifications is listed as 0.05 mm ( 0.0020 inch), then the expanded tolerance for this checking procedure would be increased to 0.10 mm ( 0.0039 inch). This expanded tolerance will not be listed in the specifications. The tolerance must be calculated by the operator of the governor calibration bench.
Illustration 1 g00657715
(1) Fuel ratio control (2) Throttle stop adjustment screw
If the governor is equipped with a fuel ratio control (FRC), connect a regulated air supply (a hand pump or a squeeze pump) to the fuel ratio control.
A regulated air supply of 140 to 210 kPa (20 to 30 psi) must be used to avoid damage to the fuel ratio control.
Adjust the speed of the calibration bench to the specified load stop rpm. Slowly move the throttle to the low idle position. Slowly move the throttle back to the throttle stop. Do not move the throttle again during this checking procedure.
The output dimension should be within the expanded tolerance dimension in "FUNC CHECK #2" of the TMI data.Note: If the governor is not equipped with a fuel ratio control, proceed to Step 11. For those governors that contain a fuel ratio control, continue with Step 8.
Ensure that the air pressure that is going to the fuel ratio control is turned OFF. Any air pressure that may have inadvertently been applied to the fuel ratio control must be removed. Disconnect the air supply hose, if necessary, in order to purge any air that may be trapped in the line.
Adjust the speed of the calibration bench to the specified rpm for the fuel ratio control.
Apply regulated air pressure to the fuel ratio control for approximately three seconds. Purge the air pressure. Rotate the throttle lever from the throttle stop to the low idle position and hold the throttle at low idle for approximately three seconds. Return the lever to the full throttle position. The output dimension should be within the expanded tolerance band for the specified dimension of the fuel ratio control.Note: For the remainder of the test, the air supply to the fuel ratio control must be on.
Adjust the speed of the calibration bench to the rpm that is specified in "FUNC CHECK #3". The output dimension should be within the expanded tolerance dimension.
Adjust the speed of the calibration bench to the specified "THROT STOP ADJ" rpm that is specified in the TMI. Wait for one minute in order for the output dimension to be within the expanded tolerance dimension for "THROT STOP ADJ". If the output dimension is still changing, you may need to wait longer.The governor is operating correctly and the governor can be used again without any adjustment if the performance of the governor is acceptable according to the tolerance checks. If the governor fails the fuel ratio control dimension check, the dimension can be reset and the governor can still be used without any further adjustments. Refer to the Testing and Adjusting, "Governor (Type) - Adjust" section in this manual. If an adjustment is made, the standard specification tolerance is applicable and the expanded tolerance is not applicable.If the governor fails any of the other dimension checks, proceed with Step 13.
It may be necessary to adjust throttle stop adjustment screw (2) during the factory dynamometer load testing in order to provide the correct engine "FULL LOAD RPM". This is due to slight variations in other engine components. The throttle stop adjustment may be correct for a particular engine, except when the governor is tested separately. The governor may be outside of the expanded tolerance for the "THROT STOP ADJ" that is specified in the TMI. Refer to Step 15 for additional information on the "THROT STOP ADJ".The output dimension that is checked in Step 12 is considered to be the correct dimension when the following conditions exist:
The governor that was tested must be installed on the original engine.
The governor must have the original lockwire and tamper resistant seal that is fastened to the throttle stop.
The engine must still have the same fuel injectors and the same fuel setting dimension.If the governor meets all three of the above conditions, use the following procedure to check the functions of the governor. Begin with Step 14. In all other instances, use the settings that are specified in the TMI. Other settings will have an unknown effect on the performance of the governor.
Increase the speed of the calibration bench until the output dimension goes to zero. Decrease the speed on the calibration bench until the output dimension is less than the throttle stop output dimension by 1 mm (0.039 inch).Wait until the output dimension is stabilized.
Slowly reduce the speed on the calibration bench until the output dimension for the "THROT STOP ADJ" that is specified in the TMI is reached. Wait until the reading stabilizes. The throttle stop output dimension speed may be higher or lower than the specified rpm. Record the throttle stop output dimension speed. This rpm should be within 100 rpm of the specified "THROT STOP RPM".Note: If the