815084 Mercury PROPELLER

Install the governor on the governor calibration bench. Refer to the Testing and Adjusting, "Installation of Governor On 1U-7326 Governor Calibration Bench " section of this manual for more information.
Verify the position of the throttle lever. Refer to the Testing and Adjusting, "Throttle Lever Orientation (Types IV, V, VI, VII, and Some III) - Check" section of this manual for more information.
If the throttle lever was positioned properly, proceed with Step 4. If the throttle lever was not positioned properly, refer to the Testing and Adjusting, "Throttle Lever (Types IV, V, VI, VII, and Some III) - Install" section in this manual for more information.
Illustration 1 g00521611
Dual Horsepower Mechanism ( Type VII) (1) Setscrew (2) Oil gallery (3) Seal (4) Spring (5) Piston Assembly (6) Valve cavity
Illustration 2 g00860886
(A) Access hole (7) Hole for the adjusting toolNote: Do not connect an oil supply line to the dual horsepower mechanism when the following procedure is performed. Make sure that the setscrew for the dual horsepower mechanism is removed.
Thread the adjusting tool into hole (7) that is for the dual horsepower setscrew (1). The low horsepower setting will be fully engaged when the setscrew bottoms out in hole (7) .
Remove the plug from access hole (A) for the load stop. Loosen the low idle adjustment screw. Loosen the throttle stop adjustment screw. Both screws should be backed out so the end of the screw is not extending past the face of the governor housing.
Connect the spring that holds the throttle against the throttle stop.
Use a 1U-7299 Rack Adjusting Wrench and a 1U-7300 Hex Wrench to loosen the adjustment screw for the load stop. Loosen the adjustment screw for the load stop until the screw is backed out completely.
Turn the power switch on the calibration bench to the ON position.
Adjust the speed of the calibration bench to the "LOAD STOP ADJ" rpm that is specified in the TMI. Check the output dimension for the "LOAD STOP ADJ" that is specified in the TMI.
Tighten the locknut on the adjustment screw for the load stop and check the "LOAD STOP ADJ" dimension again.
Increase the speed of the calibration bench by a minimum of 100 rpm. Then reduce the speed back to the original "LOAD STOP ADJ" rpm. Check the output dimension for the "LOAD STOP ADJ" again. If the dimension is not within the tolerance that is specified in the TMI, repeat Step 9.
Adjust the speed of the calibration bench to the "FUNC CHECK #2" rpm that is specified in the TMI. Output must be within specifications.
Remove the 1U-7431 Adjusting Tool from the dual horsepower mechanism and install the dual horsepower setscrew.
Use a 1U-7299 Rack Adjusting Wrench and a 1U-7300 Hex Wrench to loosen the high horsepower setscrew. Loosen the high horsepower setscrew until the screw is backed out completely.
With the governor in high horsepower mode, complete all of the other governor adjustments. These adjustments include the high horsepower setscrew adjustment, the low idle screw adjustment, and the throttle stop screw adjustment. Refer to the Testing and Adjusting, "Governor (Type VII) - Adjust" section for the adjustment procedures.Note: Do not adjust the low horsepower setscrew during the high horsepower adjustment procedures. If the low horsepower setscrew is adjusted, the high horsepower setscrew will also need to be adjusted.