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


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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

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