Jeep Wrangler driving off-road with a 4BT Cummins engine
Call us
Due to the global COVID-19 supply chain issues please expect longer than normal lead times and increased shipping costs, thank you.

Cummins ISM Engine

Cummins ISM Engines For Sale

Cummins ISM EngineCummins ISM Engines are at the forefront of the heavy-duty diesel engines in its class. The ISM undergoes thorough testing to ensure it meets the high standard Cummins demand for their products. The 6-cylinder engine produces a range of horsepower from 280 – 450. The ISM previously identified as the M11 CELECT plus but earned its ‘IS’ in 1998 when it harnessed an Interact System. Each and every element of the Cummins ISM Engine is produced using the Six Sigma process that ensures a good level of quality throughout each model.

Cummins designed the M11 ISM motor with drivers in mind, therefore the ISM provides coaching and feedback of trip data to the driver to aid in efficient and comfortable driving. Adding to this, the ISM houses a Variable Geometry Turbocharger meaning a sharp throttle response and less lag that really gets your load moving.

Engine Applications and Uses

AERA Association Member

  • Transit Bus
  • Fire & emergency
  • Heavy-Duty Truck
  • Motorhome & RV
  • Transit Bus

Common ISM Engine Problems & Failures

Listed below are a few engine problems and malfunctions frequently encountered by consumers who seek to replace their Cummins ISM due to malfunction. Unfortunately, some of the problems have the potential to cause irreparable damage to your M11 ISM motor, but timely detection of others can result in effective remedies.Cummins ISM

  • Camshaft Failure
  • Crankshaft Failure
  • Lifter/Roller Failure
  • Connecting Rod Failure
  • Spun Crankshaft Bearings
  • Cracked Cylinder Head(s)
  • Scored Pistons and Liners
  • Over Fueling
  • Lack of oil or oil pressure
  • Extreme Blow By
  • Dropped Valves

Cummins ISM Engine Replacement Options

When it comes to the wellbeing of your engine there could be an excess of issues and mishaps - worst case scenario, you could be left with an issue where you are cornered into replacing your engine. However, some circumstances may just require you to replace some parts or components, or maybe your engine just needs a mere refreshment. Of course, cost, time, and availability will play a part in your decision making, so let us inform you of the pro’s and con’s of a new Cummins ISM engine from the dealer.

Remanufacturing Process

A remanufactured Cummins ISM long block is a great replacement for someone who has been the victim of a catastrophic internal engine failure, but luckily escaped with good re-useable external components that can be salvaged from their old motor. Long blocks are also a good alternative when trying to reduce costs in when faced with such an issue.

Our team of machinists and engine builders come to do a full core tear down, cleaning, inspection, and machining of the engine before it leaves our facility to ensure perfection each and every time.

However, it is crucial to note that all of our Cummins ISM remanufactured long blocks are constructed with a combination of both reman and new parts. However, we do not recondition or refurbish former engine parts but rather completely rebuild the old ISM motor to OEM specs.

Thorough Cleaning

Every Cummins M11/ISM motor is initially stripped. Blocks, heads, rods, crankshafts and camshafts are thoroughly cleaned in a chemical jet wash or hot tank to get rid of any impurities that could hasten both early component and engine failure.


Prior to being thoroughly inspected by our quality control department, crankshafts are precision machined to exact tolerances, polished & magnafluxed.

Cylinder Heads

Heads are resurfaced to ensure a proper sealing surface with the block and a finish consistent with today's new gasket materials. Valve height is mic-d and every head is vacuum tested to assure an accurate valve seating.

Cylinder Blocks

Blocks naturally pick up imperfections, therefore, we use magnaflux which carefully inspects for cracks and defects. Cylinders are then bored, honed and inspected to precise tolerances. Torque plate honing is performed on some engines to prevent the chances of cylinder head distortion after the head is bolted and torqued to the block. This process stops a major cause of engine blow-by. Block surfaces are machined and then inspected to ensure proper finish.


Camshafts are carefully inspected and precisely machined to provide correct lift. Lobs are measured with a micrometer to make sure OEM tolerances are met.

Connecting Rods

Connecting rods are cleaned, then machined to O.E.M. specifications and honed to the standard diameter of original equipment for even distribution of stress on the bearings. New bushings are fitted and machined in all bushed rods. Every rod is carefully inspected for bend and twist.

New Parts

Our Cummins M11/ISM long block engines receive a standard set of new parts such as pistons and rings, bearings, gaskets and seals, and liners. These new parts guarantee excellent performance and consistency throughout the lifetime of the Cummins ISM. The new parts are a combination of both OEM and Aftermarket parts when available.

Request a Quote

Please fill out the form below with your information and request. A member of our staff will be with you shortly.

Remanufactured Engines Standards

The definition of remanufacture, is to make as close to new as possible. Wearable parts are automatically replaced. All Cummins ISM engine’s core material is thoroughly inspected and examined against the original equipment specifications ensuring correct dimensional tolerances. Replacement parts are new or requalified. If new, parts are made in the same production procedures as original equipment. Testing is then carried out to manufacturer specifications and original production standards.

Reman ISM Long Block Parts List:

ISM Engine

  • Intermediate Cover
  • Timed Front Gear Group
  • New Upper and Lower Gasket Set
  • Complete Loaded Cylinder Head
  • Crankshaft
  • Connecting Rods
  • Cylinder Block
  • Camshaft
  • Followers/Lifters
  • Pistons
  • Liners
  • Rings
  • **1 Year Warranty

*Note: We can provide new oil pumps, oil coolers, water pumps, turbos, injectors and fuel pumps for additional cost with the long block but will not come assembled to the engine.

**First 6 Months Parts & Labor, Second 6 Months Parts Replacement Only. Ask your sales representative for a full copy of our remanufactured long block warranty.

Cummins ISM Spec

Engine Data

Advertised Horsepower 280-450 HP (209-336 KW)
Peak Torque 1150-1550 lb-ft (1559-2102 n.m)
Governed Speed 2100 RPM
Clutch engagement Torque 700 lb.ft. (949 n.m)
Cylinders 6
Oil System Capacity 10.2 Gal (38.6 L)
System Weight 2,268 lb (1,028 kg)
Engine (Dry) 2206 lb (1,000 kg)
Aftertreatment* 62 lb (28 kg)

Cummins ISM Engine

Give us a call today at 844-340-4114 for immediate sales and support for the Cummins ISM Engine, Cummins 4BT, Cummins 6BT, 6CT, ISC, 855, QSB 4.5 L or CAT 3306. If you have any questions check out our FAQ Page. We are always ready to help or just listen to your crazy off-roading adventures!

Request A Quote


Got an Engine Down?

Discover your best options!
Get our FREE 8-Page Diesel Engine Replacement Guide

    I am looking for an