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FUEL SYSTEM

24

INTERCHANGEABILITY:

Intermixing and interchanging tube fitting

components of different manufacturers can be

dangerous.

Leak-tight seals that will withstand high pressure,

vibration, vacuum, and temperature changes depend

on close tolerances and consistent, exacting quality

control in conjunction with good design principles.

The critical interaction of precision parts is essential

for reliability and safety

B

.

PROCEDURE FOR NPT THREAD ASSEMBLY

NPT threads assembly should be completed in a

clean environment to prevent any dirt or foreign

material from entering the end-connection.

STEP 1

1 Remove the thread protector from the male

threads.

2 As the thread protector is removed from the male

threads, bits of plastic from thread protector may

remain in the mail threads.

3 Remove this material from the threads using a

clean, dry, soft-bristled brush

STEP 2

Check components to ensure minimum thread

engagement.

1 Tighten the male end-connection into the female

end-connection until finger tight.

2 Mark the wrench flat on the male component.

3 While holding the female component stationary,

loosen the male component while counting the

number of turns until the two components

separate.

4 The minimum allowable thread engagement is 2

turns. Therefore, if you can not engage at least

2 turns, do not use this combination of male and

female components. Select a different

combination of components and repeat this step

until the

MINIMUM 2

thread engagement is

achieved.

WARNING:

Do Not Assemble Components With Less Than 2

Turns Of Thread Engagement.

STEP 3

Where possible; place the component containing the

female threads into a vise (preferably one with

smooth jaws).

NOTE:

Tighten the jaws only on the

flats.

Tighten just enough to securely hold the

component as over tightening could result in

damage to the component.

Use an additional wrench in applications where a

vise cannot be used.

6