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CAT C11 Engines

CAT C11 Engines

The CAT C11 engine is a turbocharged after-cooled diesel engine designed to run applications requiring 242-336 bkW (325 bhp). The Caterpillar C11 engine is a very versatile engine due to its capability to power a wide range of applications and the fact it meets the China Stage II, EPA Tier 3 equivalent, EU Stage IIIA equivalent emission standards. They are also available using U.S. EPA and EU Flexibility, and for other regulated and non-regulated areas.

Engine Applications and Uses

  • Agriculture
  • Industrial
  • Irrigation Equipment
  • Hydraulic Power Units
  • Loaders
  • Mining
  • Construction

Common CAT C11 Engine Problems & Failures

We noticed some recurring themes from clients who intending to replace their Caterpillar C11’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, thankfully.

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

Caterpillar C11 Engine Replacement Options

Sometimes, the reality is, your engine is beyond saving, there are many defects than can impair your engine, but not all mean your engine is a goner. At times, your Caterpillar C11 engine may just need a couple 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 pro’s and con’s of a new engine from a dealer.

Remanufacturing Process

For those of you reading this that are unfortunate enough to have seen your engine suffer a fatal malfunction, a remanufactured C11 CAT long block engine would be the ideal answer. Additionally, if you have decent re-usable external components that are still in good working order, then these can be taken from your previous Caterpillar C11 engine. Most importantly, this would be a good substitute if your trying to save some cash.

We constantly strive to maintain a professional level of service, whatever the mission. In the field of remanufacturing, we guarantee this level of quality is sustained by first performing a full core tear down, cleaning, inspection, and machining of your Caterpillar C11 engine. This is carried out on every engine before it leaves our facility.

It is important to note, that all of our C11 Cat remanufactured long blocks are built with both reman and new parts. Therefore, we do not just recondition or refurbish old parts, instead, we fully rebuild the old C11 CAT engine back to its initial OEM specs.

Thorough Cleaning

Vigilant cleaning 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 Caterpillar C11 engine, 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 particle to ensure even the smallest imperfection is identified. 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 Caterpillar C11 engine blow-by. Block surfaces are then machined and examined 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

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 C11 CAT 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.

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 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 C11 CAT engine 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.

Caterpillar C11 Engine Long Block Parts List:

  • Camshaft
  • Complete Loaded Cylinder Head
  • Cylinder Block
  • Followers/Lifters
  • Intermediate Cover
  • Liners
  • Rings
  • Pistons
  • New Upper and Lower Gasket Set
  • 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 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

CAT C11 Engine Spec

Engine Data

Bore 130mm (5.12 in)
Stroke 140mm (5.51 in)
Displacement 677.36 cu in (11.1 L)
Aspiration Turbocharged Aftercooled
Rotation Counter-Clockwise
Compression Ratio 17.2:1
Weight, Net Dry w/Standard Equipment 2050 lb (930 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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