Mechanical Gas Fuel System G5.9, G8.3, G855 – Master Repair Manual 018-016   Fuel System

Table of Contents

Specifications

Specifications

TOC

Low Pressure Dry Processed Natural Gas (Low Heat Value)  950 BTU/ft3 
Low Pressure Dry Processed Natural Gas (High Heat Value)  1035 BTU/ft3 
Recommended Gas Filter Capability (Particle Size) –
Minimum 
10 Microns 
Running Pressure To Engine Mounted Regulator – Minimum  254 mm H2O [10 in H2O] 
Running Pressure To Engine Mounted Regulator – Maximum  508 mm H2O [20 in H2O] 
Pressure from the Engine Mounted Regulator – Minimum  101 mm H2O [4 in H2O] 
Pressure from the Engine Mounted Regulator – Maximum  152 mm H2O [6 in H2O] 

NOTE: Specifications assume dry processed natural gas with liquids removed. Gas composition is primarily methane, with a small percentage of ethane, that is 950 BTU cu. ft. low heat value.

Ignition Timing and Exhaust Oxygen Content
Engine *Degrees Before TDC **Excess 02% (Standby – Maximum) **Excess 02% (Prime – Continuous)
G5.9 26 0.5 0.5
GTA5.9 26 3.0 5.8
G8.3 26 0.5 2.6
GTA8.3 30 6.1 6.1
G855 24 0.5 0.5
GTA855 24 4.2 4.2
GTA14HC 20 4.0 4.0
GTA14LC 24 4.0 4.0
KTA19GC 20 6.0 6.0
KTA38GC (Standard) 35 8.6 8.6
KTA38GC (Catalyst) 35 0.3 0.3
GTA28 24 4.0 4.0
GTA38 20 5.0 5.0
GTA50 20 4.0 4.0

NOTE: *KTA19 at 1524 m [5000 ft] without derates, all other engines at 1219 m [4000 ft] without derates.

NOTE: **Without a Catalytic Converter.

Engine – Application Derates: Altitude, Ambient Air and Aftercooler Water Temperature
Engine(s) Application(s) Power Rating Compression Ratio *Maximum Altitude w/o Derate **Maximum Ambient – Intake Manifold Temperature w/o Derate Maximum Aftercooler Water Temperature
G5.9, G8.3, G855 Industrial, Generator Maximum, Standby N/A 152 m [500 ft] 29°C [85°F] N/A
G5.9, G8.3, G855 Industrial, Generator Continuous, Prime N/A 457 m [1500 ft] 38°C [100°F] N/A
GTA5.9, GTA8.3 Industrial, Generator Maximum, Standby High Compression Ratio 914 m [3000 ft] 52°C [125°F] N/A
GTA5.9, GTA8.3 Industrial, Generator Maximum, Standby Low Compression Ratio 914 m [3000 ft] 60°C [140°F] N/A
GTA5.9, GTA8.3 Industrial, Generator Continuous, Prime High Compression Ratio 1524 m [5000 ft] 52°C [125°F] N/A
GTA5.9, GTA8.3 Industrial, Generator Continuous, Prime Low Compression Ratio 1524 m [5000 ft] 60°C [140°F] N/A
GTA14, GTA28 Industrial Maximum N/A 914 m [3000 ft] 52°C [125°F] N/A
GTA14, GTA28 Industrial Continuous N/A 1524 m [5000 ft] 52°C [125°F] N/A
GTA14 Generator Standby N/A 914 m [3000 ft] 52°C [125°F] N/A
GTA14 Generator Continuous, Prime N/A 1524 m [5000 ft] 52°C [125°F] N/A
GTA19, GTA28 Generator Standby N/A 914 m [3000 ft] 38°C [100°F] N/A
GTA19, GTA28 Generator Continuous, Prime N/A 1524 m [5000 ft] 38°C [100°F] N/A
GTA19 Industrial Maximum N/A 914 m [3000 ft] 38°C [100°F] N/A
GTA19 Industrial Continuous N/A 1524 m [5000 ft] 38°C [100°F] N/A
KTA38GC, KTA19GC Industrial Continuous N/A 1524 m [5000 ft] 38°C [100°F] 54°C [130°F]
GTA38, GTA50 Generator G1 or G2 Standby N/A 914 m [3000 ft] 63°C [145°F] 54°C [130°F]
GTA38, GTA50 Generator G1 or G2 Prime N/A 1524 m [5000 ft] 63°C [145°F] 54°C [130°F]
GTA50 Generator G3 Standby N/A 305 m [1000 ft] 52°C [125°F] 43°C [110°F]
GTA50 Generator G3 Prime N/A 914 m [3000 ft] 52°C [125°F] 43°C [110°F]

NOTE: *Derate is 4% per 305 m [1000 ft] above maximum.

NOTE: **Derate is 1% per -12°C [10°F] above maximum.

Last Modified:  09-Aug-2006