Common Diesel Acronyms
You'll find many of these common diesel terms while searching for engine information, repair guides, tutorials, and more! We've put together a convenient list including terms and their definitions below.
Learn them all so you can identify them and be more involved in understanding your diesel engine.
If you'd like to learn more general information about diesel engines, read our guide on Diesel Engine Serial Numbers.
|
Term |
Comments |
Term |
Comments |
|
ACERT |
Advance Combustion Emission Reduction Technology |
DEAC |
Diesel Engine Anti-freeze/coolant |
|
ACT |
Actuator |
DEG |
Degree |
|
ADEM |
Advance Diesel Engine Module |
DI |
Direct Injection |
|
ADJ |
Adjust |
DIA |
Diameter |
|
AMB |
Ambient |
DISP |
Displacement |
|
AMOCS |
Advanced Modular Cooling System |
DIT |
Direct Injected Turbo |
|
AR |
Arrangement |
DITA |
Direct Injected Turbo After Cooled |
|
AS |
Air Shielded |
DPF |
Diesel Particulate Filter |
|
ASB |
Asbestos |
ECM |
Electronic Control Module |
|
ATTAC |
Air to Air After Cooled |
EIS |
Electronic Ignition System |
|
AUX |
Auxiliary |
ELC |
Extended Life Coolant |
|
AWC |
Air Shielded-Water Cooled |
EUI |
Electronic Unit Injection |
|
BKSVR |
Brakesaver |
EXP |
Expansion |
|
C/L |
Centerline |
FARC |
Fuel-Air Ratio Control |
|
CARB |
California Air Resource Board |
HEUI |
Hydraulic Electronic Unit Injector |
|
CCW |
Counterclockwise |
IMRM |
Improved Multiple Row (Radiators) |
|
CGI |
Clean Gas Induction |
JWAC |
Jacket Water After Cooled |
|
CR |
Compression Ratio |
LD |
Load |
|
CSTG |
Caterpillar Service Technology Group |
LI |
Low Idle |
|
CW |
Clockwise |
LTR |
Loose Top Land |
|
|
|
MAR |
Marine |
Have questions about diesel acronyms or looking for a specific part? Our ASE Certified Techs can help you with all of your technical questions!
|
Terms |
Comments |
Terms |
Comments |
|
MEUI |
Mechanically Actuated Electronically Controlled Unit INJ |
SCAC |
Separate Circuit After Cooler |
|
MIS |
Magneto Ignition System |
SCAC |
Supplemental Coolant Additives |
|
MLS |
Multi-Layer Steel Gaskets |
SCAC |
Scroll |
|
MRM |
Multiple Row Module (Radiators) |
SI |
Spark Ignited |
|
MTR |
Meter |
SM |
Sleeve Metering |
|
MUI |
Mechanical Unit Injection |
SW |
Sea Water |
|
NA |
Natural Aspirated |
SWAC |
Sea Water After cooled |
|
NG |
Natural Gas |
TA |
Turbo After Cooled |
|
NOX |
Nitrogen Oxides |
TC |
Torque Convertor |
|
OEM |
Original Equipment Manufacturer |
TIER 1 |
Emission Standards Effective 1996-2000 By Industry |
|
OFS |
Offshore |
TIER 2 |
Emission Standards Effective 2001-2006 By Industry |
|
ON HWY |
On Highway |
TIER 3 |
Emission Standards Effective 2006-2008 By Industry |
|
OP |
Oil Pressure/Opposite/Operation |
TIER 4 |
Emission Standards Effective 2008-2015 By Industry |
|
OPP |
Opposite |
TIR |
Total Indicated Runout |
|
P&L |
Pump & Line |
TIR |
Total Indicator Reading |
|
PC |
Pre-Combustion |
TO ATM |
To Atmosphere |
|
PEEC |
Programmable Electronic Engine Control |
TOL |
Tolerance |
|
RECOMD |
Recommended |
TTA |
Twin Turbo After Cooled |
|
RES |
Restriction |
TTL |
Tight Top Land |
|
RMT |
Remote |
UI |
Unit Injector |
|
ROT |
Rotation |
VOP |
Valve Opening Pressure |
Source: IPD
To learn more about diesel engine acronyms, or to discuss other diesel engine parts, contact Highway and Heavy Parts (HHP) at 844-304-7688 and speak with one of our ASE Certified Technicians. Or, you can always request a quote online!
Originally Posted October 15, 2015; Edited February 14, 2020