817430110 Mercury SCREW

Table 1
Tools Needed Quantity
4C-6594 Timing and Fuel Setting Tool 1
6V-3075 Dial Indicator 1
5P-4814 Collet Clamp 1
5P-7263 Indicator Contact Point 1 Fuel setting is the adjustment of the fuel setting screw to a specified position. The fuel setting screw limits the power output of the engine by setting the maximum travel of all the fuel injector racks.
Illustration 1 g00559781
4C-6594 Timing and Fuel Setting Tool
(1) 5P-4814 Collet Clamp
(2) 6V-3075 Dial Indicator
(3) 5P-7263 Indicator Contact Point Before the fuel setting is checked, the fuel injectors must be correctly synchronized. See the subject Testing And Adjusting, "Fuel Injector Synchronization".
Illustration 2 g00559811
Fuel Injection Linkage Control Housing
(4) Synchronizing pin
(5) Fuel setting screw
(6) Fuel setting cover
(Y) Location for the dial indicator
(Z) Location for the synchronizing pin
Remove the plugs from the housing assembly at location (Y) and (Z).
Remove synchronizing pin (4), and install the pin in the threaded hole at location (Z) without the washer. Tighten the synchronizing pin.
Illustration 3 g00559957
Installation Of The Synchronizing Pin
(4) Synchronizing pin
(5) Fuel setting screw
(6) Fuel setting cover
(7) Fuel stop lever
(Y) Location for the dial indicator
Move the actuator terminal shaft lever in the "FUEL ON" direction until the flat face of fuel stop lever (7) contacts synchronizing pin (4).
Illustration 4 g00560054
Installation Of 6V-3075 Dial Indicator
(2) 6V-3075 Dial Indicator
(4) Synchronizing pin
Put 6V-3075 Dial Indicator (2) with 5P-7263 Contact Point (3) in 5P-4814 Collet clamp (1).
Install the dial indicator (2) and the collet in the threaded hole at location (Y). When the contact point seats against fuel stop lever (7), slide the dial indicator inward or slide the dial indicator outward until the dial indicator gives a reading of 0.00 mm (0.000 inch). Tighten the collet enough in order to hold the dial indicator in position.
Remove synchronizing pin (4). Slowly move the actuator terminal shaft in the "FUEL ON" direction until the flat face of fuel stop lever (7) is against the end of the fuel setting screw (5). When the linkage is held in this position, the dial indicator reading will be the present fuel setting.
Illustration 5 g00341652
Engine Information Plate
Note: See the information plate on the engine for the correct full load static fuel setting.
If the fuel setting is correct, remove the dial indicator. Return the synchronizing pin and the washer to the original locations.
Install the plugs at location (Y) and (Z).
If the fuel setting needs adjustment, go on to Testing And Adjusting, "Fuel Setting Adjustment". Fuel Setting Adjustment
A mechanic with governor and fuel setting training is the ONLY one to make adjustments to the engine fuel setting.
Note: Before the fuel setting adjustment is made, check the fuel setting. Refer to Testing And Adjusting, "Fuel Setting Check".Refer to illustrations 2 through 4.
Cut the seal wire and remove fuel setting cover (6) and the gasket. Loosen the locknut. While "Surface A" of fuel stop lever (7) is held against the end of fuel setting screw (5) turn the fuel setting screw inward or turn the fuel setting screw outward. Turn the fuel setting screw inward or turn the fuel setting screw outward until the correct reading is shown on the dial indicator.
Tighten the locknut on fuel setting screw (5). Be sure that the fuel setting screw does not turn when the locknut is tightened.
Release the fuel control linkage. Again, move the linkage all the way in the "FUEL ON" direction. Check the dial indicator reading again in order to ensure that the fuel setting is still correct.
Remove the dial indicator and synchronizing pin (4).
Put fuel setting cover (6) and the gasket in position over the fuel setting screw. Install the bolt and synchronizing pin (4) in the cover. Install a new seal wire. Engine Speed Measurement
Illustration 6 g00286276
9U-7400 Multitach
The 9U-7400 Multitach can measure engine speed from a magnetic pickup on the flywheel housing. The 9U-7400 Multitach also has the ability to measure engine speed from visual engine parts in rotation.The Operating Instructions, NEHS0605 are included with the 9U-7400 Multitach and these operating instructions contain instructions for the test procedure.