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Mack MP8 Engine

Mack MP8 Engines For Sale

The Mack MP8 is a 13-liter engine that is capable of achieving between 415 to 505 hp, and torque from 1,460 to 1,860 lb.-ft. The MP8 had undergone some developments in its time, in 2010 - SCR (Selective Catalytic Regeneration) was introduced for both the MP7 and MP8. This technology provided major advantages regarding fuel economy and performance while topping the 2010 emissions standards.

All engines within the MP Series house intake throttles that improve heat management. They aid to increase the exhaust gas temperature at idle and low load, thereby increasing the efficiency of the exhaust aftertreatment. The Mack MP8 engine for sale is reported to be considered a legend among operators due to its high amount of horsepower and torque across a broad operating range.

Engine Applications and Uses

  • Highway Trucks
  • Heavy-Duty Vocational

Common Mack MP8 Engine Problems & Failures

We noticed some recurring themes from clients who intend to replace their MP8’s. So, we have assembled a catalog of persistent problems that are often reported. Some of the issues featured in the list below may, unfortunately, mean your engine has met its end, nonetheless, some may also be rectified if caught in good time.

AERA Association Member

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

Mack MP8 Engine Replacement Options

At times the reality is your engine is beyond saving, there are many defects that can impair your engine, but not all mean your engine is a goner. At times, your MP8 may just need a couple of new parts, or maybe it just needs a brief refreshment to keep it in working order. We do in fact understand that considerations such as time, money, availability, etc will all impact your decision-making – to that end, we have provided some insight by presenting both pros and cons of a new engine from a dealer.

Remanufacturing Process

For those of you reading this that are unfortunate enough to have seen your engine suffers a fatal malfunction, a remanufactured MP8 long block would be the ideal answer. Mack MP8 engine oil capacity is an essential aspect to consider in maintenance and performance.  Additionally, if you have decent re-usable external components that are still in good order, then these can be salvaged from your previous MP8 engine. Most importantly, this would be a good substitute if you are trying to save some cash.

We constantly strive to maintain a professional level of service, whatever the mission. In the sphere of remanufacturing, we guarantee this level of quality is sustained by first performing a full core tear down, cleaning, inspection, and machining of your MP8. This is carried out on every engine before it leaves our facility.

It is important to note, that all of our MP8 remanufactured long blocks are built with both reman and new parts. This meticulous process ensures the highest quality and adherence to standards when offering Mack MP8 engines for sale. Therefore, we do not just recondition or refurbish old parts, instead, we fully rebuild the old MP8 engine back to its initial OEM specs.

Thorough Cleaning

Vigilant cleaning, especially considering the Mack MP8 engine oil capacity, is essential during our process; therefore, we make a special effort to relieve your engine of any contaminations that could promote, catalyze or cause both component failure or entire engine failure. This is done by stripping the MP8, then putting the blocks, heads, rods, crankshafts, and camshafts through a chemical jet wash or hot tank.


Before our quality control division inspect the completed product, the crankshafts are precision machined to the precise tolerances, polished and magnafluxed.

Cylinder Heads

Heads are resurfaced to assure 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 correct valve seating.

Cylinder Blocks

The block is examined for any cracks or other damage with magnetic particles to ensure nothing is missed. The cylinders and then bored honed and again inspected to the specific tolerances. Torque plate honing is performed on particular engines to eradicate the chances of cylinder head distortion after the head is bolted and torqued to the block. This process removes the main source of engine blow-by. Block surfaces are then machined and examined to ensure a proper finish.


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

Connecting Rods

In order to achieve an even distribution of stress on all the bearings, the connecting rods are cleansed, then machined to OEM specs, then honed to the usual diameter of the original equipment. New bushings are also fitted and machined in all bushed rods, every rod is also inspected for any bend and/or twist.

New Parts

Great performance and dependability are what we strive for, therefore, all MP8 engines will obtain a set of new parts such as pistons and rings, bearings, gaskets and sealers, and liners. These parts are comprised of both OEM and Aftermarket when accessible.

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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 best define remanufacture, would be to produce something that is as close to new as possible. In pursuit of this, all the wearable parts are routinely replaced. All MP8 core materials are then thoroughly inspected and examined against original equipment specifications for correct dimensional tolerances. Replacement parts are either 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.

Mack MP8 Long Block Parts List:

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

*Note: We can provide new oil pumps, oil coolers, water pumps, turbos, injectors, and fuel pumps for an 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.


Engine Data

TypeDirect Injection Diesel
Number of Cylinders6, In-Line
Bore131 mm (5.16 in)
Stroke158 mm (6.22 in)
Displacement780 [13l]
Compression Ratio16:01
Firing Order1-5-3-6-2-4
Torque Rise89%
Clutch Engagement1215 lb.-ft [1647 n.m] @ 800 rpm
Idle Speedslow: 600 rpm adjustable – high: 2100 rpm
Engine Brake Retarding Power2597 lbs. [1177 kg]

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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