3114, 3116 and 3126Mechanical Unit Injection (MUI)Introduced 1987 1.1L and 1.2L 105HP to 300HP3114 is 4.4L 3116 is 6.6L 3126 is 7.2L

3116 and 3126Hydraulically Actuated Electronically Controlled Unit Injection (HEUI)Introduced 1997 1.1L and 1.2L 170HP to 300HP3116 is 6.6L 3126 is 7.2L

3126B/E HEUIHydraulically Actuated Electronically Controlled Unit Injection (HEUI)Introduced 1998 1.2L 175HP to 330HP3126B/E is 7.2L The major difference between the 3126B and 3126E is After treatment on exhaust and software.

3126E s/n HEPHydraulically Actuated Electronically Controlled Unit Injection (HEUI)Introduced 2001 1.2L 175HP to 330HP3126E is 7.2L The 3126E serial number prefix HEP uses a High EfficiencyPump (HEP).

C7 ACERTHydraulically Actuated Electronically Controlled Unit Injection (HEUI)Introduced 2002 7.2L 190HP to 330HP

3204 and 3208Sleeve Metering Fuel SystemIntroduced 1974 10.4L 150HP to 425HPIn 1968 these engines were sold to Ford Motor Company as 1100 Series

3304 and 3306Current Scroll Fuel SystemIntroduced 1972 7.0L and 10.5L 85HP to 355HP

3306BNew Scroll Fuel SystemIntroduced 1981 10.5L 245HP to 355HP

3306CNew Scroll Fuel SystemIntroduced 1991 10.5L 245HP to 355HP

C-9Hydraulically Actuated Electronically Controlled Unit Injection (HEUI)Introduced 1998 8.8L 335HP to 400HP

C9 ACERTHydraulically Actuated Electronically Controlled Unit Injection (HEUI)Introduced 2002 8.8L 335HP to 400HP

3176Electronic Unit Injection (EUI)Introduced 1988 10.3L 305HP to 350HP*This picture is a Dual Fuel Application. Caterpillar did not sell Dual Fuel engines. A company in California bought engines from Caterpillar and converted to Dual Fuel.

3196Electronic Unit Injection (EUI)Introduced 2000 12.0L 355HP to 450HP

3176C, C-10 and C-12Electronic Unit Injection (EUI)Introduced 2000 10.3L and 12.0L 305HP to 455HP

3176BElectronic Unit Injection (EUI)Introduced 1994 10.3L 305HP to 350HP

C11 and C13 ACERTElectronic Unit Injection (EUI)Introduced 2003 11.1L and 12.5L 305HP to 525HP

3406Current Scroll Fuel SystemIntroduced 1973 14.6L 247HP to 375HP

3406BNew Scroll Fuel SystemIntroduced 1983 14.6L 310HP to 425HP

3406CNew Scroll Fuel SystemIntroduced 1992 14.6L 310HP to 425HP

3406B Programmable Electronic Engine Control Module (PEEC)New Scroll Fuel System with Electronic GovernorIntroduced 1987 14.6L 310HP to 425HP

3406E and 3456EElectronic Unit Injection (EUI)Introduced 1994 14.6L and 15.8L 355HP to 550HP

C-15 and C-16Electronic Unit Injection (EUI)Introduced 1998 14.6L and 15.8L 410HP to 555HP

C15 and C18 ACERTElectronic Unit Injection (EUI)Introduced 2003 14.6L and 18.0L 410HP to 650HP

C7 ACERTCommon Rail Fuel SystemIntroduced 2007 7.2L 285HP to 335HPMajor differences from previous model years are fuel system and Caterpillar Regeneration System (CRS)

C13 ACERTElectronic Unit Injection (EUI)Introduced 2007 12.5L 305HP to 470HPMajor differences from previous model years are fuel system and Caterpillar Regeneration System (CRS)

C15 ACERTElectronic Unit Injection (EUI)Introduced 2007 15.2L 435HP to 650HPMajor differences from previous model years are fuel system and Caterpillar Regeneration System (CRS)

C9 ACERTCommon Rail Fuel SystemIntroduced 2007 9.3L 300HP to 375HPMajor differences from previous model years are fuel system and Caterpillar Regeneration System (CRS)