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CAT C10 Engine

CAT C10 Engines

CAT C10 EngineThe C10 CAT engine is a 10.3L engine which has remained a popular choice since its production. The Caterpillar C10 engine made its first appearance in 1995 and continued to work in numerous environments and applications. The C10 CAT provides operators with both brilliant performance and efficiency.

Caterpillar’s C10 engine also boasts an Electronic Control Module (ECM) with ATA/SAE standard data links. The ECM bragged the fact it could allow fleet managers to analyze how the vehicle and engine performed in order to determine the most efficient way to utilize their equipment. This of course was a prominent benefit of the engine.

Engine Applications and Uses

  • Marine
  • Agriculture
  • Construction
  • Defense
  • Commercial
  • Industrial
  • Generators

Common CAT C10 Engine Problems & Failures

During our years of operation, Big Bear Engine Company has gained a vast amount of experience, therefore we can accurately spot the themes and recurrences we see in people who wish to replace their C10 Cat engine. Yes, some of these are to the point where the engine is beyond saving, but others only warrant a few changed components. Below we have included a list of frequent problems we see.

  • AERA Association MemberCamshaft Failure
  • Connecting Rod Failure
  • Cracked Cylinder Head(s)
  • Over Fueling
  • 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 wellbeing of your engine there could be an overabundance of complications, worst case scenario, you could be left with an issue where your choices are limited solely to replacement. However, less serious issues may just require you to replace some parts or components, or maybe your engine is doing okay, but needs a new lease of life, requiring no more than a mere refreshment. Of course, cost, time, and availability will determine your decision making so let us inform you of the pro’s and con’s of a new CAT C10 engine from the dealer.

Remanufacturing Process

A remanufactured C10 long block by Big Bear Engine Company is a great replacement for someone who has experienced a fatal internal engine failure. Especially so if they still have working 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 the hunt for a new engine.

Our team of devoted 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 CAT C10 remanufactured long block engines are constructed with a combination of both reman and new parts. However, we do not recondition or refurbish former engine parts, instead we completely rebuild the old C10 motor back to OEM specs.

Thorough Cleaning

Every Caterpillar C10 engine is first completely stripped. Blocks, heads, rods, crankshafts and camshafts are thoroughly cleaned in a chemical jet wash or hot tank to remove any contaminations that could accelerate 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 carefully 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 accurate valve seating.

Cylinder Blocks

Blocks are inspected by magnetic particle which aims to reveal any cracks and imperfections. Cylinders are then bored, honed and inspected to precise tolerances. Torque plate honing is performed on particular engines to avoid the chances of cylinder head distortion after the head is bolted and torqued to the block. This process eliminates a major cause of CAT C10 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 ensure the OEM tolerances are met.

Connecting Rods

Connecting rods are first cleaned, then machined to O.E.M. specifications. This is done before being honed to the standard diameter of previous equipment to achieve an 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 C10 Cat long block engines all receive a standard set of new parts such as pistons and rings, bearings, gaskets and seals, and liners. These new parts assure good 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. Therefore, wearable 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 in the same production processes as original equipment. Testing is performed to manufacturer specifications and original production standards.

CAT C10 Long Block Parts List:

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

CAT C10 Engine Spec

Engine Data

Bore125mm (4.9 in)
Stroke140mm (5.5 in)
Max Torque1350 lb-ft @ 1200 RPM
AspirationTurbocharged ATAAC1
Displacement629 cu in (10.3L)
Cooling System22.7 gal (10.2 L)
Lube Oil System (refill)2.4 gal (9.4 L)
Weight, Net Dry w/Standard Equipment2050 lb (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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