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Cummins N14 Engine

Cummins N14 Engines For Sale

Cummins N14 LongblockThe Cummins N14 is an inline six-cylinder engine offering 310 – 525 hp. The original N-14 was designed in the late 80’s and produced in 1991. The N-14 took the wheel from the 855 Big Cam that was manufactured from 1976 – 1985.

The demand for a bigger engine with the same bore, stroke, and similar design as the 855 was wished for by many, and the N14 was Cummins’s reply. The main difference between the two is the cooling system. The N14 reportedly had some problems with injectors but makes up for its small imperfection because it can get the job done, its powerful, easy to maintain, and will undoubtedly last a long time. An added bonus is that the N14 is also part of the “1000,000-mile club”.

N14 Engine Applications and Uses

  • On road trucks
  • Construction
  • Industrial
  • Military

Common N14 Engine Problems & Failures

Listed Below are some engine problems and failures commonly reported by customers who intend to replace their N14 engines. Unfortunately, some of the issues listed below could lead to the permanent demise of your engine, but some, if caught early enough, may be saved.
AERA Association Member

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

Cummins N14 Engine Replacement Options

When it comes to the health of your engine there could be a plethora of problems, worse case scenario, you could be left with an issue where replacement is your only option. However, less stressing situations may just require you to replace some parts or components, or maybe your engine just needs a new lease of life requiring no more than a mere refreshment. Of course, cost, time, and availability will dictate your decision making so let us inform you of the pro’s and con’s of a new engine from the dealer. You can also see the compatible Cummins ISX15 in case a complete replacement is necessary.

N14 Cummins Replacement Options Chart

Remanufacturing Process

A remanufactured N14 long block is a perfect replacement for someone who has experienced catastrophic internal engine failure but still has good re-useable external components that may still be of use from their old motor. Long blocks are also a good alternative when trying to cut down on costs in the pursuit of a new engine.

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 important to mention that all of our Cummins N14 remanufactured long blocks are constructed with a combination of both reman and new parts. We do not recondition or refurbish old engine parts but rather completely rebuild the old N14 motor back to OEM specs.

Thorough Cleaning

Every Cummins N14 engine is completely stripped. Blocks, heads, rods, crankshafts and camshafts are carefully cleaned in a chemical jet wash or hot tank to remove all impurities that could facilitate both early component and engine failure.


Crankshafts are precision machined to exact tolerances, polished & magnafluxed, then thoroughly inspected by our quality control department.

Cylinder Heads

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

Cylinder Blocks

Regarding the blocks, we use magnetic particle to inspect for both cracks and imperfections. Cylinders are bored and honed and inspected to precise tolerances. On certain n14 engines, torque plate honing is performed to eliminate the possibility of cylinder head distortion after the head has been bolted and torqued to the block.  This process eliminates a major cause of engine blow-by. Block surfaces of the are machined and then inspected to ensure proper finish.


Camshafts are 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 N14 Parts

Our N-14 long block engines receive a standard set of new parts such as pistons and rings, bearings, gaskets and seals, liners. New parts assure dependable performance and reliability throughout the life of your engine. The new parts are a combination of OEM and Aftermarket 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

To remanufacture is to make as close to new as possible. Wearable parts are automatically replaced.

All N-14 core material is thoroughly inspected and examined against original equipment specifications for correct dimensional tolerances. Replacement parts are new or requalified. If new, parts are made in the same production processes as original equipment. Testing is performed to manufacturer specifications and original production standards.


Reman N14 Long Block Parts List:

Cummins N14 Engine

  • Cylinder Block
  • Complete Loaded Cylinder Head
  • Crankshaft
  • Connecting Rods
  • Intermediate Cover
  • Timed Front Gear Group
  • New Upper and Lower Gasket Set
  • 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 N14 Engine Specs

Engine Data

Manufacturer Cummins
Applications 1987-2001 class 7/8 on-highway trucks
Engine Type 4 Cycle Turbodiesel
Configuration Inline 6 Cylinder
Displacement 855 CID, 14.0 liters
Firing Order 1 - 5 - 3 - 6 - 2 - 4
Bore 5.5 in (140 mm)
Stroke 6.0 in (152 mm)
Compression Ratio 14.0 to 17.0:1
Valvetrain Overhead Valve (OHV), 4 Valves per Cylinder
Minimum Oil Pressure 10 psi at low idle; 35 - 45 psi at governed speed, no load
Engine Oil Capacity 11.0 gal (common for apps w/ bypass filter, oil capacity may vary)
 Rated Horsepower 310 - 525HP at 1,800 - 2,100 RPM
Rated Torque 1,250 - 1,850 lb-ft at 1,200 RPM
Engine Weight (Approx) 2,550 - 2,625 lbs. dry |

2,650 - 2,750 lbs. wet

Cylinder Head Material Cast Iron
Engine Block Material Cast Iron, Wet Cylinder Liners

Give us a call today at 844-340-4114 for immediate sales and support for the 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!

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