Procedure for Checking Balance Point

FUEL SYSTEM

TESTING AND ADJUSTMENT

CHECKING BALANCE POINT

(FULL LOAD SPEED)

Checking the Balance Point of the engine is a method

of making a diagnosis of engine performance.

If the balance point and the high idle speed are

correct, the fuel system of the engine is operating

correctly. The balance point for the engine is:

1. At full load speed.

2. The point where the load stop pin is against the load

stop.

3. The point where the engine gets the maximum

ADJUSTMENT OF LOW IDLE RPM

amount of fuel per stroke.

1.Adjustement bolt for low idle. 2. Locknut.

4. The point where

the

engine

has

maximum

horsepower output.

5. The point where an increase in load on the engine puts

the engine in a lug condition (a condition in which a

small increase in load makes the engine speed

decrease).

Procedure for Checking Balance Point

1. Connect a tachometer which has good accuracy to

the tachometer drive.

2. Connect a continuity light to the brass terminal screw

ADJUSTMENT OF LOW IDLE RPM

(1) on the cover for the load stop. Connect the other

1.Adjustment bolt for low idle. 2. Locknut.

end of the light to a place on the fuel system which is

a good electrical connection.

3. To make an adjustment to the high idle rpm, remove

the small cover (4) at the top rear of the fuel system.

4. Loosen locknut (5) and turn adjustment screw (3) to

get as near as possible to the correct high idle rpm.

5. After adjustment of high idle rpm is correct, tighten

locknut (5) and install cover (4).

TERMINAL LOCATION

1. Brass terminal screw.

3. Start the engine.

4. With the engine at operating conditions, run the

engine at high idle.

5. Make a record of the speed of the engine at high idle.

ADJUSTMENT OF HIGH IDLE RPM

3. Adjustment screw. 4. Cover. 5. Locknut.