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Caterpillar 3126B Engine Engine

The Caterpillar 3126B is a 7.2 L 6-cylinder ataac1 engine rated at 2500 rpm, producing up to 336 kW. It powers generator sets from Caterpillar, including the 3126. It holds 49 L (12.9 gal) of oil and 49 L (12.9 gal) of coolant.

Also known as: CATERPILLAR 3126B

Part of the Caterpillar 3126B engine family — 3 variants share parts & fitment.

7.2 L
Displacement
6
Cylinders
2500 rpm
Rated speed
336 kW
Gross power

Engine specifications

Oil capacity49.0 L
Coolant capacity49.0 L
Displacement7.2 L
Cylinders6
AspirationATAAC1
Rated speed2500 rpm
Gross power336 kW

Generator sets powered by this engine

1
Caterpillar 3126

Parts cataloged across the Caterpillar 3126B family

300
Part #DescriptionCategory
01768-AAA-000Air cleaner with dry type radial seal, service indicator, automatic dust ejectorair_filter
DZ117503ALTERNATOR (24V, 190A) (3126)alternator
06789-AAA-000Serpentine belt, automatic tensionerbelt
2100-5789Remote Grease Fittingbelt
M-1S1187Alternator, V, .50in (12.7mm) - 84.00in (2134mm)belt
03678-AAA-000Parking brake - multi-disc, sealed and oil cooledbrake
8991188Check Valve Assemblycheck_valve_assembly
g00737484Hydraulic Electronic Unit Injectorselectrical
03459-AAA-000Demand fanfan
1R-0753Fuel Secondary - ADVfilter
175-4360High Efficiency Fuel Filterfuel_filter
175-4370High Efficiency Fuel Filterfuel_filter
175-4390High Efficiency Fuel Filterfuel_filter
M-13935261 1 Fuel Filter Base Gasketfuel_filter
10R-0781REMANUFACTURED FUEL INJECTOR - 3126B (GP, TYPE 2)fuel_injector
1265466Regulator Gasketgasket
1360812Regulator Gasketgasket
1393526Fuel Filter Base Gasketgasket
1443472Intake Manifold Cover Gasketgasket
1P436Fuel Priming Pump Gasketgasket
1S7057Turbo Oil Supply Gasketgasket
2175701Valve Cover Gasketgasket
2225915Regulator Gasketgasket
2337654Oil Cooler Gasketgasket
2337655Oil Cooler Gasketgasket
2613816Oil Pan Gasketgasket
2720388Valve Cover Gasketgasket
2721956Exhaust Manifold Gasketgasket
2850365Regulator Gasketgasket
4Y9652Cam Follower Cover Gasketgasket
5P5678-2Valve Cover Gasketgasket
7C7431Turbo Mounting Gasketgasket
7W2398Turbo Oil Drain Gasketgasket
7W5340Oil Pickup Tube Gasketgasket
7X2528Water Pump Installation Kitgasket
M-1050452Oil Pickup Tube Gasket 35, 38gasket
M-11362501 Manifold to Cylinder Head Oil Cooler Gasketgasket
M-11542451 Manifold to Cylinder Head Intake Manifold Gasketgasket
M-11929501 Valve Cover Gasketgasket
M-11930721 Oil Pan Gasketgasket
M-12654661 Regulator Gasketgasket
M-12798111 Friont Cover Gasketgasket
M-13598191 Cam Follower Cover Gasketgasket
M-13608121 Regulator Gasketgasket
M-13932526Front Cover Gasket 19, 29gasket
M-14434721 Oil Cooler Gasketgasket
M-16134116 Dry Manifold Front Cover Gasketgasket
M-16617811 Front Cover Gasketgasket
M-16974871 Oil Pan Gasketgasket
M-19144571 Regulator Housing Gasket to Cylinder Headgasket
M-19504521 Oil Pick Up Tube Gasketgasket
M-19573391 1 Regular Gasketgasket
M-19784181 Turbo Oil Supply Gasketgasket
M-1P04511 3 3/4in x 4 1/4in Turbo Mounting Gasketgasket
M-1P4361 Fuel Priming Pump Gasketgasket
M-1S70571 1 Valve Cover Gasketgasket
M-20972901 Oil Pan Gasketgasket
M-20972931 Oil Cooler Core Gasketgasket
M-21757012 Valve Cover Gasketgasket
M-21923401 Regulator Housing Gasket 2pc Housinggasket
M-22134941 Valve Cover Gasketgasket
M-2223915Regulator Gasket 29gasket
M-22259151 Regulator Gasketgasket
M-23376551 Inner Oil Cooler Gasketgasket
M-25856461 Intake Manifold Cover Gasketgasket
M-26138161 Oil Pickup Tube Gasketgasket
M-26929041 Turbo Oil Drain Gasketgasket
M-28503651 Turbo Mounting Gasketgasket
M-2886699Gasket Set - Front Structuregasket
M-2S07952 Core Gasketgasket
M-2W72121 1 Regular Gasketgasket
M-3K3601 Oil Pan Gasketgasket
M-4551109Gasket Set - Rear Structuregasket
M-4P16241 Intake Manifold Gasketgasket
M-4Y96522 3 Exhaust Manifold Gasketgasket
M-6I30331 1 Front Cover Gasketgasket
M-6V82601 Cam Follower Cover Gasketgasket
M-7C11511 Intake Manifold Cover Gasketgasket
M-7C11591 Intake Manifold Cover Gasketgasket
M-7C11621 Inner Oil Cooler Gasketgasket
M-7C11631 Outer Oil Cooler Gasketgasket
M-7C74311 1 Turbo Oil Drain Gasketgasket
M-7M72731 Water Cooled Valve Cover Gasket Uppergasket
M-7W23981 1 Turbo Oil Supply Gasketgasket
M-7W53401 1 Regulator Gasketgasket
PG219CSGasket Set, Conversion Setgasket
64F4M072SB1WM 3126 Series, 2-Valve, AllHP Any long block with installed injector setinjector
64F8M072SB7AS, 8YL, 9SZ, CKM, HEP 3126 Series, 3-valve, All HP, Any long block with installed injector setinjector
M-03289704 6 Injector O-Ring - Lowerinjector
M-11487186 Injector O-Ring - Upper HEUIinjector
M-11930614 6 Injector Tubeinjector
M-12582746 Injector O-Ring - Lower HEUIinjector
M-12782134 6 Fuel Injector - MUIinjector
M-12782164 6 Fuel Injector - MUIinjector
M-12782184 6 Fuel Injector - MUIinjector
M-12782224 6 Fuel Injector - MUIinjector
M-12782254 6 Fuel Injector - MUIinjector
M-1355970Nozzle - Piston Coolinginjector
M-22712006 Injector Tubeinjector
M-22729116 Injector Tubeinjector
M-22914906 Injector Tubeinjector
M-4P29954 6 Fuel Injector - MUIinjector
M-4P85774 6 Pushrod - Injectorinjector
M-6V62284 6 Injector O-Ring - Upperinjector
g00107406Clutchmechanical
g00367054Engine Liftingmechanical
119-5152Coolant Extender**oil_filter
M-3P11562 Oil Filter Base Gasketoil_filter
04567-AAA-000Pre-screenerother_service
101-2844Oil Panother_service
2133193Connecting rodother_service
64F4D250SB3126 Series, 2-valve, AllHPother_service
64F4L072WM3126 Series, 2-valve, 170-300HP, 1WM Serial Numbers - All, (built with the articulated cast steel 2 piece piston)other_service
64F8D190SB7AS, 8YL, 9SZ, CKM 3126, 3-valve, 190-210HP, Freightlinerother_service
64F8D210SB7AS, 8YL, 9SZ, CKM 3126, 3-Valve, 190-210HP, GMC Bus, Thomas Busother_service
64F8D230SB7AS, 8YL, 9SZ, CKM 3126, 3-Valve, 230HP, Freightlinerother_service
64F8D250SB7AS, 8YL, 9SZ, CKM 3126, 3-Valve, 250-up HP, Freightlinerother_service
64F8D300SB7AS, 8YL, 9SZ, CKM 3126, 3-Valve, 230-up HP, GMC Busother_service
64F8L072A3126 Series, 3-valve, 190-210HP, 1-piece piston, 1283883 Front Housingother_service
64F8L072B3126 Series, 3-valve, 230HP & UP, 2-piece piston, 1283883 Front Housingother_service
64G1L072SB3126 Series, Long Block, Build to Orderother_service
64G2D210SBHEP 3126, 3-valve, 190-210HP, Freightlinerother_service
64G2D250SBHEP 3126, 3-Valve, 230-up HP, Freightlinerother_service
64G2L072A3126 Series, 3-valve, 190-210HP, 1-piece piston, Cast Iron Front Housingother_service
64G2L072BHEP 3126 Series, 3-valve, 230HP & Up, 2-piece piston, Cast Iron Front Housingother_service
AEHQ5541-02953C Track Loaderother_service
AEHQ5589Heavy-Duty Hinged Radiator Grilleother_service
LG230Home Maintenance Kitother_service
M-0L10262 Cup Plugother_service
M-0L3642 Exhaust Manifold Lockother_service
M-10115303 3 Main Bearing - STDother_service
M-10144953 11 5RMother_service
M-1051710other_service
M-1051720other_service
M-107754520 4KR INDother_service
M-10775537 3RJ TRUCKother_service
M-107756322 11 2FGother_service
M-10776046 6 Cylinder Salvage Sleeveother_service
M-10777081 3 Main Bearing - STDother_service
M-1077852other_service
M-11362002 3 Exhaust Manifold Lockother_service
M-1154124CB634/3BR-5CL 39other_service
M-11542231 Regulator - 97ºCother_service
M-116371512 -Stud Taperlock*other_service
M-11930456 Valve Spring - Intakeother_service
M-11930751 1 Regular - 94ºCother_service
M-12273756 Valve Guide - Exhaustother_service
M-12436861 Oil Cooler Setother_service
M-12658691 Regular - 94ºCother_service
M-12755371 Oil Cooler Core Transmissionother_service
M-12798101 Exhaust Manifold Lockother_service
M-133498340 11 9ZRother_service
M-13350376 Spring Retainer - Exhaust 0.540in Thickother_service
M-133504425 11 6MSother_service
M-13444836 6 Spring Retainer - Exhaustother_service
M-13608194 6 Valve - Exhaustother_service
M-13712601 Fuel System Setother_service
M-13767156 6 Spring Seat - Exhaustother_service
M-13767186 6 Valve Spring - Exhaustother_service
M-140618812 12 Valve Spring - Intakeother_service
M-140967012 12 Valve Guide - Intakeother_service
M-14195011 Fuel System Setother_service
M-14222221 Oil Cooler Setother_service
M-1427307100 11 2FRother_service
M-1443444100 4ES TRUCKother_service
M-14501621 3 Main Bearing - 0.25mm OSother_service
M-14501633 3 Main Bearing - 0.25mm OSother_service
M-14501641 3 Main Bearing - 0.50mm OSother_service
M-14501653 3 Main Bearing - 0.50mm OSother_service
M-145739012 12 Valve - Intakeother_service
M-14782116 6 Valve - Exhaustother_service
M-14782186 Valve Seat - Exhaustother_service
M-14782206 6 Valve Guide - Exhaustother_service
M-150462126 11 3TRother_service
M-15129397 Main Bearing - STDother_service
M-15488531 Air Compressor Set Machineother_service
M-155950412 Valve Seat - Intakeother_service
M-15602352 5 Exhaust Manifold Lockother_service
M-15641791 Air Compressor Set Industrialother_service
M-157712912 Valve - Intakeother_service
M-15771306 Valve - Exhaustother_service
M-16081946 Connecting Rod Bushingother_service
M-16142806 Valve - Intakeother_service
M-163244212 Valve - Intakeother_service
M-16357351 Fuel System Setother_service
M-16390636 Valve Seat - Intakeother_service
M-164655633 11 6MKother_service
M-165426534 9ZF MARINEother_service
M-16629051 1 Intergral Styleother_service
M-16636486 Piston Pinother_service
M-16872246 6 Piston Pinother_service
M-16872266 6 Piston Pin - Articulatedother_service
M-1723282other_service
M-175045414 Main Cap Boltother_service
M-1753671100 11 BEJother_service
M-176768812 Valve Seat - Intakeother_service
M-176769012 Valve Seat - Exhaustother_service
M-187412312 Valve - Intake Marineother_service
M-188312212 Valve - Exhaustother_service
M-19035626 Cylinder Linerother_service
M-190611524 Valve Spring - Innerother_service
M-190611724 Valve Spring - Outerother_service
M-19669291 Fuel System Setother_service
M-19669311 Oil Cooler Setother_service
M-1979320other_service
M-1979340G3E TRUCKother_service
M-197936813 C9Jother_service
M-19793716 Piston Pinother_service
M-1979372Piston Pin Retainer 6other_service
M-1W27134 6 Valve Seat - Exhaustother_service
M-1W271516 24 Valve Lockother_service
M-20358052 Camshaft Bushing - Intermediateother_service
M-20360901 Camshaft Bushing - Rearother_service
M-21074401 Expansion Tank Setother_service
M-21074451 Water Lines Setother_service
M-211213424 Valve Spring - Retainerother_service
M-21248931 1 Main Bearing - STDother_service
M-212891712 Valve Seat - Exhaust Marineother_service
M-212891812 Valve Seat - Intake Marineother_service
M-21331906 Connecting Rod Bearing - STDother_service
M-21331934 6 Connecting Rod Assemblyother_service
M-21655861 1 Camshaft Bearingother_service
M-217521312 Valve Seat - Intakeother_service
M-21848781 Air Compressor Set Truckother_service
M-22114061 Air Compressor Set Truckother_service
M-22438711 Rear Structure Setother_service
M-22438961 Rear Structure Setother_service
M-22443841 Rear Structure Set - Wetother_service
M-22466384 6 Connecting Rod Bearing - STDother_service
M-22951531 1 Main Bearing - 0.25mm OSother_service
M-22951541 1 Main Bearing - 0.50mm OSother_service
M-23212856 6 Valve Seat - Exhaustother_service
M-23827019DG549 And Up 16 CKPother_service
M-23827164 6 Piston Skirtother_service
M-2382720100 11 JRAother_service
M-23827266 6 Piston Skirtother_service
M-238272929 DCD INDother_service
M-23827356 Piston Pinother_service
M-241838212 Valve - Intakeother_service
M-241838312 Valve - Exhaustother_service
M-241838412 Valve Spring Retainer - Intakeother_service
M-241838512 Valve Spring - Outerother_service
M-241838612 Valve Spring - Innerother_service
M-241838812 Valve Seat - Intakeother_service
M-242154212 Valve - Intake Marineother_service
M-24250401 Central And Lower Allother_service
M-24367161 Main Bearing And Thrust Set - STDother_service
M-24631502 Thrust Plateother_service
M-246985512 Valve - Exhaust Marineother_service
M-24771331 Regulator - 190ºCother_service
M-24855131 Regulator - 180ºCother_service
M-259582912 Valve Guide - Intakeother_service
M-260485624 Valve Guideother_service
M-26115441 Crankshaft Assembly w/ Timing Gearother_service
M-26249711 Oil Cooler Setother_service
M-2627330other_service
M-2629288other_service
M-264615712 12 Valve Seat - Intakeother_service
M-26643251 Cantral And Lower Set Industrial And Generatorother_service
M-26645611 Central And Lower Setother_service
M-26659071 Central And Lower Set Marineother_service
M-26672831 Central And Lower Setother_service
M-27156581 Crankshaft w/o Gearother_service
M-27219566 6 Exhaust Manifold Lockother_service
M-272231214 X9Y 14other_service
M-272981312 Intake Seatother_service
M-2780574100 11 FMLother_service
M-2807281100 11 M7Gother_service
M-28217717 Main Bearing - 0.25mm OSother_service
M-28217727 Main Bearing - 0.51mm OSother_service
M-28224786 Connecting Rod Bearing - 0.25mm OSother_service
M-28224796 Connecting Rod Bearing - 0.51mm OSother_service
M-28497441 Central And Lower Setother_service
M-28601846 Piston Pinother_service
M-28784461 Front Structure Setother_service
M-28805541 Front Structure Setother_service
M-288447271 Front Structure Setother_service
M-28847351 Front Structure Setother_service
M-28859421 Front Structure Setother_service
M-29001851 Oil Cooler Setother_service
M-29001861 Rear Structure Setother_service
M-29005281 Rear Structure Set - Wet Housingother_service
M-29071491 Fuel System Setother_service
M-29071501 Front Structure Setother_service
M-29086761 Rear Structure Setother_service
M-29191571 Rear Structure Set - Wet Housingother_service
M-29191601 Central And Lower Set Machineother_service
M-29191611 Fuel System Setother_service
M-29191621 Front Structure Setother_service
M-29393671 Oil Cooler Coreother_service
M-2A442912 12 Valve Lock - Exhaustother_service
M-2W00274 6 Connecting Rod Bushingother_service
M-2W72134 6 Camshaft Bearingother_service
M-2W75661 1 Idler Gear Bushingother_service
M-2W99301 Idler Gear Bushing Smallother_service
M-30834141 Air Compressor Set Truckother_service
M-30834151 Central And Lower Setother_service
M-30834181 Front Structure Setother_service
M-30834191 Oil Cooler Setother_service
M-30834201 Rear Structure Setother_service

Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.

Aftermarket parts that fit this engine

60
S300W PartsGeek 241-9059 PartsGeek FridayParts $933.50 329-8051 PartsGeek FridayParts $933.50 3126B PartsGeek kuduparts $18.00 SJB00001-UP PartsGeek 272-6955 PartsGeek 247-8782 PartsGeek 318C PartsGeek yemparts $32.22 320C PartsGeek sinocmp $6.00 320D PartsGeek sinocmp $35.00 321C PartsGeek yemparts $42.22 322C PartsGeek yemparts $29.15 323D PartsGeek yemparts $35.77 324D PartsGeek yemparts $29.15 325C PartsGeek sinocmp $6.00 3E-0156 PartsGeek sinocmp $29.00 966D PartsGeek yemparts $52.61 966E PartsGeek yemparts $52.61 950E PartsGeek yemparts $52.61 950B PartsGeek yemparts $52.61 3E-5382 PartsGeek yemparts $290.58 446B PartsGeek yemparts $66.79 AP-1000 PartsGeek yemparts $30.72 AP-1050 PartsGeek yemparts $81.78 7Y-0463 PartsGeek yemparts $37.03 320DL PartsGeek yemparts $37.03 320D2 PartsGeek yemparts $37.03 325B PartsGeek yemparts $37.03 7V-3842 PartsGeek 125-8810 PartsGeek 950F PartsGeek yemparts $52.61 960F PartsGeek yemparts $127.43 966H PartsGeek yemparts $129.53 966M PartsGeek 970F PartsGeek yemparts $31.48 972H PartsGeek sinocmp $69.00 213-0772 PartsGeek FridayParts $148.80 3176C PartsGeek kuduparts $18.00 7G-7889 PartsGeek sinocmp $329.00 105-4849 PartsGeek FridayParts $82.99 914G PartsGeek yemparts $42.24 924G PartsGeek yemparts $43.48 950H PartsGeek yemparts $58.17 972G PartsGeek yemparts $49.44 3E-6466 PartsGeek FridayParts $73.99 162-2073 PartsGeek FridayParts $73.99 3406C PartsGeek atldiesel $0.73 910E PartsGeek yemparts $42.24 918F PartsGeek yemparts $42.24 924F PartsGeek FridayParts $78.60 962G PartsGeek yemparts $54.51 107-4401 PartsGeek FridayParts $43.99 3054C PartsGeek woodline $9.24 3056E PartsGeek woodline $3.85 928G PartsGeek yemparts $106.33 938F PartsGeek yemparts $54.51 109-7041 PartsGeek FridayParts $44.00 924H PartsGeek yemparts $48.94 928HZ PartsGeek yemparts $40.62 930G PartsGeek yemparts $53.16

Parts listed by aftermarket suppliers as fitting this engine — leads compiled from supplier catalogs; verify the exact part for your serial number.

Filters for this engine

  • Air filter: Caterpillar 2453818 Caterpillar 1318221 Caterpillar 30009151 Caterpillar 2456375 Caterpillar 2456376 Caterpillar 3I1550 Caterpillar 1282686 Caterpillar 6I2502
  • Coolant filter: Caterpillar 3I1288 Caterpillar 9N3366 Donaldson P552071 Donaldson P554071 Ac Delco WF4
  • Fuel filter: Caterpillar 1165436 Caterpillar 2568753 Caterpillar 5134490 Caterpillar 1R0753 Caterpillar 1466695 Caterpillar 3I1253 Donaldson P550625 Donaldson P551000
  • Oil filter: Caterpillar 0773673 Caterpillar IR1807 Caterpillar 3890434 Caterpillar 492164004 Caterpillar 1W3300 Donaldson P550008 Donaldson P551807 Donaldson P551808

Cross-referenced via Donaldson + OEM/engine-maker interchange — options to verify against your serial number, not confirmed for every exact variant.

Common questions

What is the oil capacity of the Caterpillar 3126B?

The Caterpillar 3126B engine has an oil capacity of 49.0 liters.

What is the displacement of the Caterpillar 3126B?

The Caterpillar 3126B has a displacement of 7.2 liters with 6 cylinders.

Which generators use the Caterpillar 3126B engine?

The Caterpillar 3126B powers 1 generator set(s), including Caterpillar 3126.