FUEL SYSTEM. - TM-10-3930-622-140056

5-44. FUEL SYSTEM.

5-49. DRAIN SYSTEM. Operate the engine at a fast

idle until normal engine operating temperature is

reached. A fast idle will stir up any loose rust, scale or

5-45. CARBURETOR ADJUSTMENT.

other formations in the cooling system. Stop engine and

remove radiator filler cap. Open cylinder block and

a. With the fork lift truck on level ground, turn the

radiator drain cocks and allow cooling system to drain.

idle adjusting needle with the fingers until it is barely

5-50. CLEAN SYSTEM. Close radiator and cylinder

seated, then back off exactly one turn.

cocks. Be sure temperature of engine is below 200 deg

Fahrenheit. Pour cleaning compound into radiator and

NOTE

fill coolant system with water. Install pressure-type cap

Do not seat the idle adjusting needle

on radiator. Start engine and operate it at fast idle until

too tightly since the tip of the needle

solution is heated to at least 180 deg Fahrenheit. Use a

will groove and prevent smooth

cardboard to cover radiator, if necessary, but do not

engine idling.

Discard .grooved

allow the solution to boil. Continue to operate the engine

needle and install new idle adjusting

at least 30 minutes. Stop the engine, remove radiator

needle as necessary.

cap, open radiator and cylinder block drain cocks and

allow system to drain completely.

b. Start engine and run until normal operating

5-51. NEUTRALIZE SYSTEM. Close radiator and

temperature is reached. Adjust idle speed screw as

cylinder block drain cocks. Pour inhibitor into radiator, fill

required to obtain an idle speed of 500 rpm (just enough

system with clean, fresh water and install radiator cap.

to prevent stalling during the warmup period).

Start engine at a fast idle, using radiator cover, if

necessary, to bring engine operating temperature to at

5-46. AIR CLEANER SERVICING.

least 180 deg Fahrenheit. Continue to operate engine

for at least ten minutes. Remove radiator cap, open

a. To maintain low resistance to air flow, the filter

radiator and cylinder block drain cocks and allow system

element must be inspected periodically and cleaned

to drain completely.

thoroughly when dirty.

5-52. FLUSH SYSTEM. Close radiator and cylinder

b. Unscrew wing-nut, remove hood and lift off filter.

block drain cocks. Fill system with clean, fresh water

Wash filter in solvent. Allow to dry.

(soft, if possible) and install radiator cap. Start engine

c. Pour old oil from filter body and replace with

and operate at a fast idle, using radiator cover as

clean oil.

necessary to bring engine operating temperature to at

d. Reassemble unit.

least 180 deg Fahrenheit. Continue to operate engine

for at least five minutes. Remove radiator cap, open

5-47. COOLING SYSTEM.

radiator and cylinder block drain cocks and allow system

to drain. If water is discolored to any extent, repeat this

5-48. PREVENTIVE CLEANING. To clean the cooling

flushing operation.

system of scale, rust or sludge, use engine cooling

system cleaning compound and inhibitor. Be sure to

CAUTION

flush system thoroughly after cleaning as the cleaner

Do not flush system by inserting a

contains a strong acid which, if not completely removed,

hose in the radiator with the engine

may attack the parts of the cooling system.

running and drain cocks open. This

procedure will close the thermostat

CAUTION

and stop circulation of coolant

Do not pour cold coolant into the

through the engine.

radiator when engine temperature is

above 200 deg.

Fahrenheit. Cold

5-53. CLEANING RADIATOR. Clean the radiator cap

coolant,

regardless

engine

by spraying a stream of water (hot, if possible) through

temperature, will close the thermostat

the holes in the valve cage while moving the valve up

and prevent the complete filling of

and down with a pencil or a blunt wooden instrument.

the engine water jackets and

Clean out dirt, trash and insects imbedded in the air

passages. When filling the system

passages of the radiator, using compressed air or a

with a cold coolant, always operate

stream of water. Do not use steam.

the engine until normal operating

temperature is reached (thermostat

opens), then add coolant as required.