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Mechanical Gas Fuel System G5.9, G8.3 – 005-042   Fuel Regulator, NG

Table of Contents

Remove
Install
Adjust

Remove

 TOC

 WARNING 

Natural gas is explosive and flammable. Always be sure to maintain adequate ventilation in the work area. Keep all cigarettes, flames, pilot lights, arcing equipment, and switches out of the work area and areas with shared ventilation to reduce the possibility of severe personal injury or death when working on a natural gas system.
 WARNING 

Natural gas is lighter than air. Check the ceiling of the area where work is to be done for any possible ignition sources.
 
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 CAUTION 

To reduce the possibility of shock loading the components downstream of the supply valve, opening and closing of the gas supply valve must be done slowly.

Slowly close the gas supply manual shut off valve.

  
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Loosen the flange bolts and allow the gas pressure to vent. Once vented, remove the nuts and bolts from the flanges of the regulator valve.

Remove the regulating valve and flange gaskets.

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Install

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Check the flange faces on the piping. Remove any residue of the old gasket material.

Install the gas regulator, new gaskets, flange nuts and bolts.

Tighten the flange nuts and bolts in a crisscross pattern.

KTA38GC 24 n.m [18 ft-lb]
Other Mechanical Gas Engines 80 n.m [60 ft-lb]

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 CAUTION 

To reduce the possibility of shock loading the components downstream of the supply valve, opening and closing of the gas supply valve must be done slowly.

Slowly open the gas supply valve.

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Use a gas detector to check the flanges and valve for possible leakage.

If leakage is found, repeat the repair procedure.

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Adjust

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 CAUTION 

To reduce the possibility of shock loading the components downstream of the supply valve, opening and closing of the gas supply valve must be done slowly.

Slowly close the gas supply manual shut off valve.

  
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Remove the adjustment screw cap from the regulator valve.

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Connect a pressure gauge downstream of the pressure regulator.

NOTE: The location of the pressure gauge is at the discretion of the end user.

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 CAUTION 

To reduce the possibility of shock loading the components downstream of the supply valve, opening and closing of the gas supply valve must be done slowly.

Slowly open the gas supply valve.

  
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Check the pressure gauge. If the pressure is above 508 mm H2O
[20 in H2O] or below 254 mm H2O [10 in H2O]
it must be adjusted.

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If the pressure is below 254 mm H2O [10 in H2O], turn the adjustment screw clockwise to increase the pressure.

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If the pressure is above 508 mm H2O [20 in H2O], turn the adjustment screw counter clockwise to decrease the pressure.

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 CAUTION 

To reduce the possibility of shock loading the components downstream of the supply valve, opening and closing of the gas supply valve must be done slowly.

Slowly open and close the supply valve several times to allow the bleed down and build up of pressure. Check the pressure gauge for the proper pressure setting.

NOTE: The pressure must also be checked with the engine running.

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If the pressure is correct, install the adjustment screw cap.

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Last Modified:  09-Aug-2006
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Published by Jack

Hello, I'm Jack, a diesel engine fan and a blogger. I write about how to fix and improve diesel engines, from cars to trucks to generators. I also review the newest models and innovations in the diesel market. If you are interested in learning more about diesel engines, check out my blog and leave your feedback.