Engine Overspeed Device; Crankcase Ventilation; Fuel System; Alternator And Regulator - Hobart JET-EX 4 Operation And Maintenance Manual

OM-2049
(2) Cooling fan
The cooling fan on the engine is designed to blow air out through the radiator rather than to draw
it in. This prevents hot air, heated by the engine, from entering the generator.
(3) Engine speed governor
The engine speed governor (4, Figure 3) is a constant speed mechanical governor. Its actuator
arm is linked to the carburetor fuel control lever by a rod with ball joints threaded on both ends.
This governor maintains the engine speed at approximately 2600 RPM when the generator is in
operation.

(4) Engine overspeed device

The engine and generator are protected against the danger of overspeed by an overspeed relay
(21, Figure 3). This unit is a sealed, solid-state device which is wired into the primary ignition cir-
cuit. It senses the distributor pulses, and when they reach a frequency which indicates an engine
speed of approximately 3150 RPM, an internal relay shorts the ignition circuit to ground and shuts
down the engine.

(5) Crankcase ventilation

This engine is equipped with an open crankcase ventilation system. This open ventilation system
consists of a breather cap on the rocker arm cover.

(6) Fuel system

The fuel system consists of an 21-gallon (79.5 liters) tank (13, Figure 3) and a diaphragm type
fuel pump (17) with all the necessary fittings and hoses. A 12 volt, solenoid operated shutoff valve
(14) is mounted in the fuel line in front of the tank. It shuts off the supply of fuel to the engine
when the ENGINE (ignition) switch on the control panel is in the STOP/SHUTDOWN position (ig-
nition OFF). This keeps the engine from flooding due to the gravity flow or siphoning from the tank
when the engine is not running.
Power to open the solenoid valve is supplied when the ENGINE switch is in the START and RUN
positions.

(7)Alternator and regulator

The battery charging alternator (20, Figure 3) is rated at 40 amperes. Its voltage regulator (18) is
mounted on the side of the left engine support.

(8)Starter relay

The starter relay (8, Figure 3) is mounted on the right side of the lifting yoke near the starter motor.

(9) Carburetor

The carburetor, specially designed for engine governor type applications, is mounted on the en-
gine and adjusted at the Hobart factory. Replacement carburetor, spare parts, and repair kits are
availbable from Hobart Brothers only.
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