0304136 JOHNSON EXTENSION,Gearcase 5 INCH LONGER PARTS


0304136 EXTENSION,Gearcase 5 INCH LONGER PARTS JOHNSON 20R69B, 20R70C, 20R71S, 20R72R, 20R73A, 25E72R, 25E73A, 25E74M, 25E75B, 25E76E, 25R69B, 25R70C, 25R71S, FD-22A EXTENSION
0304136 EXTENSION,Gearcase 5 INCH LONGER PARTS JOHNSON
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20-04-2022

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OMC 5" Extension 18,20,25 HP Gearcase Johnson Evinrude Outboard P/N 304136 0304136
Number on catalog scheme: 52
 

BRP JOHNSON entire parts catalog list:

20R69B, 20R69D, 20RL69B, 20RL69D 1969
20R70C, 20R70E, 20RL70C, 20RL70E 1970
20R71S, 20RL71S 1971
20R72R, 20RL72R 1972
20R73A, 20RL73A 1973
25E72R, 25EL72R, 25R72R, 25RL72R 1972
25E73A, 25EL73A, 25R73A, 25RL73A 1973
25E74M, 25EL74M, 25R74M, 25RL74M 1974
25E75B, 25EL75B, 25R75B, 25RL75B 1975
25E76E, 25EL76E, 25R76E, 25RL76E 1976
25R69B, 25R69D, 25RL69B, 25RL69D 1969
25R70C, 25R70E, 25RL70C, 25RL70E 1970
25R71S, 25RL71S 1971
FD-22A, FD-22E, FD-22M, FDL-22A, FDL-22E, FDL-22M 1968

Information:


Illustration 1 g00285112
Typical solenoidThe solenoid has windings (one or two sets) around a hollow cylinder. There is a spring-loaded plunger inside the cylinder. The plunger can move forward and backward. When the start switch is closed and the electricity is sent through the windings, a magnetic field is made. The magnetic field pulls the plunger forward in the cylinder. The motion moves the shift lever in order to engage the pinion drive gear with the ring gear. The front end of the plunger makes contact across the battery and the motor terminals of the solenoid. The starting motor begins to turn the engine flywheel.When the start switch is opened, current no longer flows through the windings. The spring pushes the plunger back to the original position. The spring simultaneously moves the pinion gear away from the flywheel.When two sets of windings in the solenoid are used, the windings are called the hold-in winding and the pull-in winding. Both of the winding have the same number of turns around the cylinder. However, the pull-in winding uses a wire with a larger diameter in order to produce a greater magnetic field. When the start switch is closed, part of the current flows from the battery through the hold-in windings. The rest of the current flows through the pull-in windings to the motor terminal. The current then goes through the motor to the ground. When the solenoid is fully activated, current is shut off through the pull-in windings. Only the smaller hold-in windings are in operation for the extended time. This time is the amount of time that is needed for the engine to start. The solenoid will now take less current from the battery. The heat that is made by the solenoid will be kept at an acceptable level.Electric Starting Motor
The starting motors are used to turn the engine flywheel in order to get the engine running.
Illustration 2 g01192489
Cross section of the starting motor (typical example) (1) Field (2) Solenoid (3) Clutch (4) Pinion (5) Commutator (6) Brush assembly (7) ArmatureThe starting motor has a solenoid. When the start switch is activated, electricity will flow through the windings of the solenoid. The solenoid core will move in order to push the starting motor pinion with a mechanical linkage. The pinion engages with the ring gear on the flywheel of the engine. The starting motor pinion engages the ring gear before the contacts in the solenoid close the circuit between the battery and the starting motor. When the circuit between the battery and the starting motor is complete, the pinion will turn the engine flywheel. A clutch gives protection to the starting motor. The engine cannot turn the starting motor too fast. When the start switch is released, the starting motor pinion will move away from the flywheel ring gear.Starting Motor Protection
The starting motor is protected from damage in two ways:
The starting motor is protected from engagement with the flywheel ring gear when the engine is running. The control feature will not allow the starting motor to engage if the speed is above 0 rpm.
The starting motor is protected from continued operation by holding the key in the "start" position after the engine starts. The starting motor solenoid is disengaged after engine speed reaches 300 rpm.


Parts extension JOHNSON:

0383845
 
0383845 EXTENSION KIT ASSY. 5 INCH LONGER PARTS
20R69B, 20R70C, 20R71S, 20R72R, 20R73A, 25E72R, 25E73A, 25E74M, 25E75B, 25E76E, 25R69B, 25R70C, 25R71S
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