SPECIFICATIONS

V-8, 4-Stroke-Cycle, Spark-Ignited Bore—in (mm) . . . . . . . . . . . . . . . . . . . . . . . 5.4 (137)Stroke—in (mm) . . . . . . . . . . . . . . . . . . . . . . 6.0 (152)Displacement—cu in (L) . . . . . . . . . . . . . . . 1099 (18)Lube Oil Capacity—U.S. gal (L)

TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 (189) Aspiration. . . . . . . . . . . Naturally Aspirated (NA) or. . . . . . . . . . . . . . . . . Turbocharged-Aftercooled (TA)Jacket Water System—U.S. gal (L) .Capacity w/o Radiator . . . . . . . . . . . . . . . . . 15 (56)

Gas Pressure Requirements—psi (bar) .TA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 (1.4)NA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 (0.1)

Compression RatioHCR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10:1LCR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.5:1

G3408145-450 hp

GasIndustrialEngine

Shown withOptional Equipment

FEATURES

■ DIESEL STRENGTHAll Caterpillar® gasengines are built on diesel frames which means greater service life. Caterpillar gas engines inherit more from their diesel counterparts than just strength. They are backed by the same support systemrecognized as one of the most sophisticated and dependable in the world.

■ APPLICATION FLEXIBILITYBroad operating speed range and ability to burn a wide spectrum of gaseous fuels.

■ CATERPILLAR® GAS ENGINES

Represent the latest technology in engine design and efficiency. Engines are offered in both Naturally Aspirated (NA) andTurbocharged/Aftercooled (TA)configurations with both high and lowcompression ratios. These configurationsoffer unique extras such as:

• State-of-the-art combustion technology forimproved fuel consumption.

• Modern componentry, designed and rigorously tested to provide excellent performance, reliability, and durability.

Air cleanerstwo-stage, with rain capand service indicator

Breather, crankcaseCarburetor, natural gasCooler, lubricating oilFilter, lubricating oil

bypass (TA only)FlywheelGovernor,

Woodward PSGHousing, SAE No. 0Ignition system

Altronic IIILifting eyes

Manifold, exhaust, watercooled

Paint, Caterpillar yellowPumps,

auxiliary water, gear driven,centrifugal

non-self-priming (TA only)jacket water, gear driven

Regulator, gas pressureSAE standard rotationService meterSupports, engineThermostats and housingTorsional vibration damper

Air cleaners and accessoriesBases and foundationsControls and governorsCooling systems,

heat exchangersaftercooler groupsexpansion tank

Exhaust fittingsFuel systemsGauges and instrument panelsIgnition system

Altronic III solid state, dualtiming, CSA shielded (meetsClass I, Division 2, Group D)

MufflersPower takeoffsProtection devicesStarting systems

CONTINUOUS RATINGS (bhp)

PHYSICAL FACTORS

G3408 GAS INDUSTRIAL ENGINE

STANDARD EQUIPMENT OPTIONAL EQUIPMENT

Aspiration 1800 rpm 1600 rpm 1400 rpm 1200 rpm 1000 rpm

TA-90 HCR 450 400 350 300 250TA-130 HCR 400 355 311 265 225TA-90 LCR 415 370 330 285 235TA-130 LCR 375 290 300 260 215NA HCR 255 235 210 175 145

Height Width Length Weight

in (mm) in (mm) in (mm) lb (kg)

TA 59.4 (1509) 57.9 (1471) 62.8 (1594) 3700 (1680)

STD NA 63.9 (1622) 49.8 (1265) 62.9 (1598) 3450 (1566)

FUEL CONSUMPTION DATA

G3408 GAS INDUSTRIAL ENGINE

15000

14000

13000

12000

11000

10000

9000

8000

7000

100 200 300 400 500

19.7�

18.3�

16.9�

15.5�

14.1�

12.7�

11.3�

9.9

1000 rpm

1200 rpm

1400 rpm1600 rpm

1800 rpm

bhp

Btu

/bh

p-h

r

bkW

MJ

/bk

W-h

r

75 149 224 298 37315000

14000

13000

12000

11000

10000

9000

8000

7000

100 200 300 400 500

19.7�

18.3�

16.9�

15.5�

14.1�

12.7�

11.3�

9.9

1000 rpm

1200 rpm

1400 rpm1600 rpm

1800 rpm

bhp

bkW

Btu

/bh

p-h

r

MJ

/bk

W-h

r

75 149 224 298 373

15000

14000

13000

12000

11000

10000

9000

8000

7000

100 200 300 400 500

19.7�

18.3�

16.9�

15.5�

14.1�

12.7�

11.3�

9.9

75 149 224 298 373

bhp

Btu

/bh

p-h

r

bkW

MJ/b

kW

-hr

1000 rpm

1200 rpm

1400 rpm1600 rpm

1800 rpm

15000

14000

13000

12000

11000

10000

9000

8000

7000

100 200 300 400 500

19.7�

18.3�

16.9�

15.5�

14.1�

12.7�

11.3�

9.9

bhp

Btu

/bh

p-h

r

bkW

MJ/b

kW

-hr

1000 rpm

1200 rpm

1400 rpm1600 rpm

1800 rpm

75 149 224 298 373

15000

14000

13000

12000

11000

10000

9000

8000

7000

100 200 300 400 500

19.7�

18.3�

16.9�

15.5�

14.1�

12.7�

11.3�

9.9

bhp

Btu

/bh

p-h

r

bkW

MJ/b

kW

-hr

1000 rpm

1200 rpm

1400 rpm1600 rpm

1800 rpm

75 149 224 298 373

HCR TA-90 HCR TA-130

LCR TA-90 LCR TA-130

G3408 NA

90 refers to aftercooler water inlet temperature in90° F (32° C). 130 refers to aftercooler water inlettemperature in 130° F (54° C).

CONDITIONS AND DEFINITIONS

GAS INDUSTRIAL ENGINE PHYSICAL FACTORS

G3408 GAS INDUSTRIAL ENGINE

Ratings are based on SAE J1349 standardconditions of 29.61 in Hg (100 kPa) and 77° F (27° C). These ratings also apply at ISO3046, DIN6271, and BS5514 standard conditions of29.61 in Hg (100 kPa), 81° F (27° C); and API 7B-11C standard conditions of 29.38 in Hg (99 kPa), 85° F (29° C).

Ratings are based on dry natural gas having alow heat value of 905 btu/ft3 (35.54 MJ/N m3).Variations in altitude, temperature, and gascomposition from standard conditions mayrequire a reduction in engine horsepower.

Turbocharged-aftercooled ratings apply to 5000 ft (1525 m) and 77° F (25° C). Naturally

aspirated engines apply to 500 ft (150 m) and 77° F (25° C). For applications which exceed theselimits, consult your Caterpillar dealer.

Additional ratings may be available for specificcustomer requirements. Consult your Caterpillarrepresentative for details.

Materials and specifications are subject to change without notice. The International System of Units (SI) is used in this publication.

LEHQ6797 © 1996 Caterpillar Inc. Printed in U.S.A.Supersedes LEHQ0736 All rights reserved.

01 Centerline of Crankshaft

02 Centerline of Engine

03 Rear Face of CylinderBlock

103 Jacket Water Inlet

104 Jacket Water Outlet

125 Aftercooler Water Inlet

126 Aftercooler Water Outlet

201 Fuel Inlet

401 Air Inlet

402 Exhaust

RD Removal Distance

Note: General Configuration not to be usedfor installation.

TA Configuration show.See General Dimension Drawing 7W0085 for additional details.

103

02

201

298.

4 (1

1.75

)24

8.9

(9.8

0)

402

298.

4 (1

1.75

)

104 401

1115

.2 (

43.9

1)

RD

01 01 01 01

276.9 (10.90)

524.

9 (2

0.67

)

02

292.

1 (1

1.50

)

104

1038.9 (40.90)

104 126

125

201

0303

770.4 (30.33)

425.6 (16.76)

608.

9 (2

3.97

)

1137

.4 (

44.7

8)

222.

3 (8

.75)