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CAT C10 Engine

CAT C10 Engines

Yellow C10 Cat EngineThe C10 CAT engine is a 10.3L power plant  that has managed to remain a popular choice since its production. The Caterpillar C10 engine made its first appearance in 1995 and has served time in numerous environments and applications. The C10 provides operators with sound performance and great fuel efficiency.

Caterpillar’s C10 engine boasts an Electronic Control Module (ECM), complete with ATA/SAE standard data links. When released, CAT touted the fact that its ECM allowed fleet managers to analyze how the vehicle and engine performed in order to determine the most fuel efficient way to run their equipment. This, of course, was a prominent point of appeal for the C10 engine.

Engine Applications and Uses

  • Marine
  • Agriculture
  • Construction
  • Military/Defense
  • Commercial
  • Industrial
  • Power Generation

Common CAT C10 Engine Problems & Failures

During our years of operation, at Big Bear Engine Company, we've gained a vast amount of knowledge of the C10 engine. This allows us to accurately identify its pattern problems and the recurring themes we see in people looking to replace their C10 Cat engine. Yes, in some circumstances the engine is beyond saving, but in others all that's warranted is a few new components. Below, we've included a list of frequent problems we see with the C10.

  • Blue Logo of AERACamshaft Failure
  • Connecting Rod Failure
  • Cracked Cylinder Head
  • Overfueling
  • Lifter/Roller Failure
  • Crankshaft Failure
  • Scored Pistons and Liners
  • Spun Crankshaft Bearings
  • Lack Of Oil or Oil Pressure
  • Extreme Blow By
  • Dropped Valves

Caterpillar C10 Engine Replacement Options

When it comes to the health of your used engine, there could be an overabundance of complications contributing to its poor performance. Worst case scenario, you could be left with a situation where your choices are limited solely to complete engine replacement. However, less severe issues may only require you to replace some parts or components. Of course, many engines are running OK, but could use, a new lease of life, such as a refresh. In the end, cost, time, and availability will ultimately determine your decision, which is exactly why we spell out the pros and cons of buying a new CAT C10 engine from the dealer below.

C10 Cat Engine Replacement Options Chart

Remanufacturing Process

A remanufactured C10 long block from Big Bear Engine Company is a great replacement option for the customer who has experienced a catastrophic internal engine failure. And this is an especially appealing option if they still have working reusable external components that can be salvaged from the old engine. Long blocks are a great alternative to buying new when you're trying to reduce costs associated with replacing an engine.

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

We'll also note that all of our remanufactured CAT C10 long block engines are built with a combination of both reman and new parts. We do not recondition or refurbish old engine parts. Instead, we completely rebuild your old C10 back to OEM specs.

Thorough Cleaning

Every Caterpillar C10 engine is first completely stripped. Th block, head, crankshaft, connecting rods, and camshafts are all thoroughly cleaned in a chemical jet wash or hot tank to remove any contaminants that could accelerate both early component and/or engine failure.


Prior to being thoroughly inspected by our quality control department, each crankshaft is precision machined to exact tolerances, polished, and then magnafluxed.

Cylinder Head

Each head is carefully resurfaced to ensure a proper sealing surface with the block and a finish that's consistent with today's new head gasket materials. Valve height is mic'd and the head is also vacuum tested to ensure accurate valve seating.


The block is inspected by magnetic particle, which reveals any cracks and imperfections in its casting. Cylinders are then bored, honed, and inspected to precise tolerances. Torque plate honing is performed on particular engines to eliminate the risk of cylinder distortion once the head is installed and torqued to the block. This process rules out a major cause of CAT C10 engine blow-by. All block surfaces are machined and inspected to ensure proper finish.


Every camshaft undergoes careful inspection and then is precisely machined to provide correct lift. Lobes are measured with a micrometer to ensure proper OEM tolerances are met.

Connecting Rods

Connecting rods are first cleaned, then machined to OEM specifications. This is performed before the rods are honed to the standard diameter of previous equipment in order to achieve an even distribution of stress across the bearings. New bushings are fitted and machined in all bushed rods. Every rod is also carefully inspected for indications of bend and/or twist.

New Parts

All of our C10 Cat long block engines receive a standard set of new parts such as pistons and rings, bearings, gaskets and seals, and liners. These new parts assure optimal performance and reliability throughout the life of your engine. New parts are a combination of OEM and aftermarket, when available.

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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 Engine Standards

To remanufacture is to make something as close to new as possible. Therefore, wearable engine parts are automatically replaced. All CAT C10 engine core materials are also thoroughly inspected and examined against original equipment specifications for correct dimensional tolerances. Replacement parts are new or requalified. If new, parts are made using the same production processes as original equipment. Testing is also performed according to manufacturer specifications and original production standards.

CAT C10 Long Block Parts List:

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

*Note: We can provide a new oil pump, oil cooler, water pump, turbo, injectors and fuel pumps for additional cost(s) with the long block, but these components will not come assembled to the engine.

**1-Year Warranty: 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 C10 Engine Specs

Engine Data

Bore4.90-inch (125mm)
Stroke5.50-inch (140mm)
Max Torque1350 lb-ft at 1,200 rpm
AspirationTurbocharged ATAAC1
Displacement10.3L (629 ci)
Cooling System2.7 gal (10.2 L)
Lube Oil System (refill)2.4 gal (9.4 L)
Weight, Net Dry w/Standard Equipment2,050 lbs (932 kg)

Give us a call today at 844-340-4114 for immediate sales and support for the Caterpillar C10 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!

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