Cummins, 3.9L - 4B, Drop-In, On/Off Highway CUMD4BA


Contact with ESN: (877) 599-4806,

Part Base:
Price Match Guarantee
Core Deposit:
Refundable Core Deposit
Step Van, Industrial/Construction
On/Off Highway:
On/Off Highway
3.9L - 4B
Model Years:

Product Overview

Cummins 4B Mech, Drop-In, On/Off Highway, 76-130hp, 1986-96. Applications: Case, Doosan/IR, Freightliner, Tiger Cat.


Cummins 4B Mech 76-130hp, 1986-96. OE Reference: DR100RX, 3.9L, Complete Drop-In, Construction/Industrial, 1984-96, 76 HP @ 2,500 RPM, Naturally Aspirated, Front Sump, Lucas CAV Rotary Pump, CPL 591.

CPL Listing:

CPL 591

About This Engine:

A solid, high-torque, low-RPM four-cylinder engine, the Cummins B-Series is found in many over-the-road and industrial applications. Pilot Engines offers engines specific to your applications--The goal is to provide an engine with little to no modification required at install ensuring you are back on the road faster.

Vehicle/Equipment Types:

The Cummins 4B/3.9L engine is found in many step van applications including bread, snack, uniform, and other commercial delivery vehicles. This engine is also used in various industrial and construction applications. In many instances, Pilot Engines can offer a custom engine remanufactured for your vehicle or equipment.


Pilot Engines carries the 4B/3.9L in the following configurations: Dyno Tested Complete Drop-In and Long Block Supreme (Industrial).


Pilot Engines warrants to the original buyer that every product will be free from proven defects in material and workmanship. Pilot Engines warranty obligation will be limited, at our opinion, to repair or replace with another rebuilt engine. All warranty work must be preauthorized by Pilot Engines. To activate the warranty, all engines must be registered within 30 days from shipment. Complete Drop-In engines carry a full 2 year/unlimited mile warranty. The second year covers the long block only. The long block engines carry a 1 year/unlimited mile warranty. Off-Road applications are covered for 1 year/2000 hours. Some restrictions apply; see limited warranty details or call for more information.

Dyno Test:

All of Reviva's Complete Drop-In engines are 100% dyno tested prior to shipment. Computer controls ensure that each engine dyno test is conducted under standard, repeatable settings. Every engine is run through a warm up cycle; three separate segments simulating light, medium and heavy throttle conditions; maximum torque and horsepower tests; both high and low idle tests; and a black light leak detection test with dyed oil, coolant and fuel. Reviva also tests oil and coolant temperature; monitors crankcase pressure, oil and turbo boost pressures; and tests fuel consumption.