Caterpillar 3406 14.6L Remanufactured Engine For Sale
Premium remanufactured Caterpillar 3406 14.6L diesel engine available for sale starting at $14,895. Every engine is completely disassembled, cleaned, inspected, and rebuilt to meet or exceed original Caterpillar specifications. Dyno tested with a 1-year unlimited mileage warranty.
This engine fits 160+ vehicle models (1981-2013).
| Manufacturer | Caterpillar |
|---|---|
| Engine Series | 3406 |
| Displacement | 14.6L |
| Fuel Type | DIESEL |
| Cylinders | 6 |
| Fits | 1995 White/GMC WHL (Straight Truck - High Tilt) |
| Condition | Remanufactured (Long Block) |
| Warranty | 1-Year Unlimited Mileage |
| Shipping | Nationwide Shipping Available |
Price: $14,895
Call (631) 991-7700 for a quote or request a quote online.
Caterpillar 3406 14.6L Technical Specifications & Engineering Deep Dive
The Caterpillar 3406 14.6L is a Inline 6-cylinder, overhead camshaft diesel engine designed for heavy-duty commercial and industrial applications where maximum durability and torque output are essential. The C15 was Caterpillar's flagship on-highway engine, designed to deliver maximum power and durability for the most demanding trucking applications. Its HEUI fuel system was revolutionary for its time, providing electronic precision with hydraulic force.
Core Engine Specifications
| Architecture | Inline 6-cylinder, overhead camshaft |
|---|---|
| Bore x Stroke | 137mm x 171mm (5.4" x 6.75") |
| Compression Ratio | 16.2:1 to 17.1:1 |
| Fuel Injection | HEUI (Hydraulic Electronic Unit Injection) / MEUI-A (ACERT models) |
| Aspiration | Single turbocharger (pre-ACERT) / Twin turbochargers (ACERT) |
| Block Material | Cast iron with replaceable wet cylinder liners |
| Head Material | Cast iron, 4 valves per cylinder |
| Valvetrain | Overhead camshaft with roller followers |
| Firing Order | 1-5-3-6-2-4 |
| Oil Capacity | 38-46 quarts |
| Coolant Capacity | 13-17 gallons |
| Dry Weight | Approximately 3,200 lbs |
| Horsepower Range | 435-625 HP |
| Torque Range | 1,550-2,050 lb-ft |
| Production Years | 1999-2017 (replaced by C15 ACERT, then CT15) |
Key Engineering Features
- HEUI fuel system provides precise injection timing control
- Replaceable wet liners for field rebuild capability
- ACERT technology (2004+) uses twin turbos for emissions control
- Legendary durability with many engines exceeding 1.5 million miles
Critical Performance Specifications
- Peak torque at 1,200 RPM for excellent startability
- B50 life exceeding 1,000,000 miles
- Jake brake rating up to 600+ HP
- HEUI injection pressure up to 28,000 PSI
- Oil change interval 15,000-25,000 miles
Competing Engines in This Class
The Caterpillar 3406 14.6L competes directly with Cummins ISX/N14, Detroit Series 60 14L, Volvo D16 in the Class 8 heavy-duty segment. Each engine has its strengths, but the Caterpillar 3406 is known for exceptional durability, strong aftermarket support, and proven reliability in demanding applications.
Our Caterpillar 3406 14.6L Remanufacturing Process — Complete 9-Step Breakdown
Our remanufacturing process for the Caterpillar 3406 14.6L goes far beyond a simple rebuild. While a "rebuilt" engine only replaces obviously worn parts (leaving near-end-of-life components in place), our remanufacturing process returns every component to original equipment manufacturer specifications — or better. This is the same standard used by Caterpillar when producing a brand-new engine. Here is exactly what happens to every Caterpillar 3406 during our comprehensive process:
- Complete Disassembly: Every component is removed from the engine block and cataloged. Bolts, studs, and fasteners are inspected for stretch and fatigue. The bare block, crankshaft, connecting rods, cylinder heads, and all internal components are separated for individual inspection.
- Cleaning & Crack Inspection: The block undergoes hot tank chemical cleaning to remove all carbon, oil deposits, and scale. After cleaning, magnetic particle inspection (MPI) detects surface cracks in ferrous components, while dye-penetrant testing checks aluminum parts. Any component with cracks is rejected.
- Precision Block Machining: The deck surface is milled to within 0.001" flatness tolerance. Cylinder bores are honed with torque plates installed (simulating head bolt stress) to achieve the exact crosshatch pattern needed for proper ring seating. Main bearing saddles are align-honed to ensure perfect crankshaft alignment.
- Crankshaft Reconditioning: The crankshaft is ground and polished to achieve a 4-8 microinch Ra surface finish on all journals. Each journal is measured in multiple planes to verify roundness within 0.0001". The crankshaft is then dynamically balanced to reduce vibration and bearing wear.
- Cylinder Head Reconditioning: Heads are pressure tested at 60 PSI to verify no internal cracks or porosity. Valve seats receive a precision 3-angle valve job for optimal sealing. Valve guides are replaced if worn beyond specification. Springs are tested for proper tension and replaced if below spec.
- Assembly with New Components: The engine is assembled with all-new pistons, piston rings, main and rod bearings, gasket sets, seals, timing components, and oil pump. All components are verified against OEM part numbers and specifications before installation.
- Torque Verification: Every critical fastener is torqued using calibrated equipment following the exact OEM torque sequence and values. Head bolts, main cap bolts, connecting rod bolts, and flywheel bolts all receive documented torque verification.
- Dynamometer Testing: The completed engine is run on our dynamometer to verify horsepower output, torque curve, oil pressure at all RPM ranges, fuel consumption, and absence of leaks. The engine must meet or exceed factory specifications before passing.
- Final Inspection & Shipping Prep: After passing dyno testing, the engine receives a final visual inspection, all openings are sealed against moisture and contamination, rust-preventive oil is applied to all exposed surfaces, and the engine is mounted on a shipping pallet with protective wrapping.
This complete remanufacturing process is why we can confidently offer a 1-year unlimited mileage warranty on every Caterpillar 3406 long block. We know exactly what condition every internal component is in because we inspected, measured, and either replaced or restored each one to specification. There are no unknown variables — unlike a used or rebuilt engine where worn components may fail unpredictably.
What's Included in Our Caterpillar 3406 Long Block
Every remanufactured Caterpillar 3406 long block includes:
- Remanufactured block (machined to OEM tolerances)
- New pistons and piston rings (matched set)
- New main bearings and rod bearings
- Remanufactured crankshaft (ground and polished)
- Remanufactured connecting rods (resized and magna-fluxed)
- Remanufactured cylinder head(s) (pressure tested, new valves/springs/guides as needed)
- New camshaft and lifters (or verified within spec)
- New timing gear set / timing chain
- New oil pump
- Complete gasket set and all seals
- New freeze plugs and expansion plugs
Not included (transfer from your old engine): Turbocharger, fuel injectors, injection pump/rail, intake/exhaust manifolds, alternator, starter, water pump, A/C compressor, power steering pump, wiring harness, ECM/ECU, and all external accessories.
Caterpillar 3406 14.6L Applications & Vehicle Compatibility
The Caterpillar 3406 14.6L powers the 1995 White/GMC WHL and many other vehicles in its class. This engine platform has proven itself through millions of miles of real-world service in demanding conditions.
Common Vehicle Applications
- Kenworth W900, T800, T2000
- Peterbilt 379, 386, 388
- Freightliner Classic, FLD120
- Western Star 4900
- Off-highway and marine applications
Our remanufactured Caterpillar 3406 long block is a direct bolt-in replacement that uses all of your existing accessories, wiring harness, and emissions equipment. This eliminates the need for custom fabrication or adapter kits — saving significant installation time and labor costs. The engine mounts, bellhousing pattern, and accessory drive are all identical to your original engine.
For fleet operators and owner-operators who need to get back on the road quickly, our remanufactured Caterpillar 3406 eliminates the uncertainty of a used engine while costing 40-60% less than a brand-new unit from the dealer. Most orders ship within 24-48 hours with delivery in 3-7 business days.
Caterpillar 3406 14.6L Maintenance Schedule & Longevity Guide
Proper maintenance is the single most important factor in determining how long your remanufactured Caterpillar 3406 14.6L engine will last. With correct maintenance following the schedule below, a remanufactured Caterpillar 3406 should deliver 500,000 to 1,000,000+ miles of reliable service — essentially the same life expectancy as a brand-new engine from the factory.
Recommended Maintenance Schedule
| Service Item | Interval | Details |
|---|---|---|
| Engine oil and filter change | Every 15,000-25,000 miles | Use CJ-4 or CK-4 rated 15W-40 oil. Heavy-duty filtration system with bypass filter recommended. Monitor oil analysis for early warning of internal wear. |
| Fuel filter replacement | Every 15,000-25,000 miles | Replace both primary (water separator) and secondary fuel filters. Contaminated fuel is the #1 cause of injector failure in diesel engines. |
| Coolant system service | Every 50,000 miles or annually | Check supplemental coolant additive (SCA) levels, inspect hoses and clamps, pressure test system to 15 PSI, and verify thermostat operation. |
| Valve lash adjustment | Every 100,000-150,000 miles | Critical for overhead camshaft engines. Incorrect valve lash causes poor performance, increased fuel consumption, and potential valve/piston contact. |
| Turbocharger inspection | Every 250,000 miles | Check for shaft play (radial and axial), inspect compressor and turbine wheels for damage, verify wastegate or VGT actuator operation. |
| In-frame overhaul assessment | At 500,000-750,000 miles | Compression test, oil analysis trends, and visual inspection determine if an in-frame (top-end) overhaul is needed before a full remanufacture. |
Critical Break-In Procedure (First 500 Miles)
The first 500 miles are the most critical period for your remanufactured engine's long-term performance and longevity. During this break-in period, new piston rings are seating against freshly honed cylinder walls, and new bearings are conforming to their journals. Follow these guidelines strictly:
- Vary engine speed and load — Do not cruise at a constant RPM. Varying speed helps rings seat evenly across the entire cylinder bore.
- Avoid sustained high RPM — Keep RPM below 1,800 RPM for the first 500 miles.
- Avoid heavy towing or maximum load — Keep loads to 50% capacity for the first 1,000 miles.
- Monitor oil pressure and temperature — Watch for any abnormal readings that could indicate a problem.
- Change oil at 500 miles — This removes initial break-in wear particles and metal fines from the oil system.
- Check for leaks daily — Minor seepage at gasket surfaces may occur during initial thermal cycling and is normal if it stops within the first 100 miles.
Caterpillar 3406 14.6L Cost of Ownership: Remanufactured vs New vs Used vs Rebuilt
When your 1995 White/GMC WHL needs a new engine, you have four primary options. Understanding the true cost of each option — including warranty coverage, expected lifespan, and risk of failure — is essential for making the right decision. Here is how a remanufactured Caterpillar 3406 compares to the alternatives:
| Option | Typical Cost | Warranty | Expected Life | Risk Level |
|---|---|---|---|---|
| Repair existing engine | $8,000-$25,000 | 90 days (labor only) | Varies widely | High — other worn components remain |
| Used/junkyard engine | $5,000-$12,000 | 30-90 days | Unknown | Very High — unknown history |
| Rebuilt engine | $10,000-$20,000 | 6-12 months / limited miles | 200,000-400,000 mi | Medium — near-end-of-life parts remain |
| Remanufactured long block | $12,000-$22,000 | 1 year / unlimited miles | 500,000-1,000,000 mi | Low — all components at OEM spec |
| Brand new from dealer | $30,000-$50,000+ | 2-5 years | 1,000,000+ mi | Lowest |
A remanufactured Caterpillar 3406 long block delivers the best value per mile of service. You get new-engine reliability and warranty protection at 40-60% less than a dealer-new engine. For commercial operators, the reduced downtime risk alone justifies the investment — a single breakdown can cost $1,000-$5,000 per day in lost revenue, towing fees, and emergency repair premiums.
Why not just repair? When an engine fails catastrophically (spun bearing, cracked block, dropped valve), repairing only the immediate failure leaves all other worn components in place. A 300,000-mile engine with new bearings still has 300,000-mile pistons, rings, and valve train. A remanufactured engine eliminates this risk by restoring everything to zero-mile condition.
Caterpillar 3406 14.6L Installation Guide & Tips
Installing a remanufactured Caterpillar 3406 14.6L long block is straightforward for an experienced diesel technician. Our engines are direct bolt-in replacements designed to use all existing accessories and emissions equipment from your original engine.
Estimated Installation Time
Class 8 trucks: 16-24 hours. Medium-duty trucks: 12-18 hours. Time varies based on vehicle accessibility, emissions system complexity, and technician experience.
Components to Transfer from Old Engine
The following components must be transferred from your old engine to the new long block:
- Turbocharger assembly (inspect and replace if worn)
- Fuel injectors (consider replacing if high mileage)
- Injection pump or fuel rail (inspect for wear)
- Intake and exhaust manifolds
- Alternator, starter motor, and A/C compressor
- Water pump and thermostat housing (recommend replacing)
- Power steering pump
- All sensors and wiring harness
- ECM/ECU (engine control module)
- Flywheel or flexplate (inspect for wear/cracks)
- EGR valve and cooler (clean or replace)
- DPF, DOC, and SCR components (emissions system)
Critical Installation Notes
- Prime the oil system — Before first start, prime the oil system by cranking without fuel (disconnect injector harness) until oil pressure registers. This prevents dry-start bearing damage.
- Fill cooling system slowly — Fill at a rate that allows air to escape. Use a vacuum fill tool if available to prevent air pockets that cause overheating.
- Verify all sensor connections — A single disconnected sensor can prevent starting or cause the engine to run in limp mode.
- Check all fluid levels — Verify oil, coolant, and DEF levels before first start.
- Follow break-in procedure — See the maintenance section above for critical first-500-mile break-in guidelines.
We provide free phone support at (631) 991-7700 during installation. Our technicians can walk you through any step of the process.
Caterpillar 3406 14.6L Engine History & Heritage
The C15 was Caterpillar's flagship on-highway engine, designed to deliver maximum power and durability for the most demanding trucking applications. Its HEUI fuel system was revolutionary for its time, providing electronic precision with hydraulic force.
Production of the Caterpillar 3406 spans 1999-2017 (replaced by C15 ACERT, then CT15), during which time the engine has been continuously refined and improved. At US Engine Production, we have been remanufacturing Caterpillar engines for over 40 years. Our deep experience means we understand every revision, every common failure point, and every improvement opportunity for the Caterpillar 3406 platform.
Over the decades, we have remanufactured thousands of Caterpillar 3406 engines and have developed proprietary processes that address known weak points in the original design. This institutional knowledge — combined with our investment in precision machining equipment and testing facilities — is what allows us to produce remanufactured engines that often outlast the originals.
Whether you're replacing a failed engine in a Kenworth W900, T800, T2000 or building a reliable power unit for a new application, our remanufactured Caterpillar 3406 delivers the quality and reliability that Caterpillar intended — backed by our 1-year unlimited mileage warranty and over four decades of remanufacturing expertise.
Frequently Asked Questions About Caterpillar 3406 14.6L Remanufactured Engines
- How long will a remanufactured Caterpillar 3406 last?
- With proper maintenance, a remanufactured Caterpillar 3406 should deliver 500,000 to 1,000,000+ miles of reliable service — essentially the same lifespan as a brand-new engine from the factory.
- What warranty do you offer on the Caterpillar 3406?
- Every remanufactured Caterpillar 3406 long block comes with our 1-year unlimited mileage warranty. No mileage caps, no fine print. If anything fails due to a manufacturing defect within the warranty period, we cover it.
- What's the difference between remanufactured and rebuilt?
- A rebuilt engine only replaces obviously worn parts — leaving near-end-of-life components in place. A remanufactured engine is completely disassembled and every component is restored to OEM specifications or replaced with new. This is why remanufactured engines carry longer warranties and last longer.
- How quickly can you ship a Caterpillar 3406?
- Most engines ship within 24-48 hours of order confirmation. Delivery typically takes 3-7 business days via freight carrier to anywhere in the continental United States.
- Can I install this engine myself?
- While technically possible for experienced mechanics, we recommend professional installation by a qualified diesel technician. Proper installation is critical for warranty coverage and engine longevity. We provide free phone support during installation.
- Do you offer core return?
- Yes. We offer a core deposit refund when you return your old engine core within 30 days. The core must be complete (no missing major components) and returnable (not seized or damaged beyond remanufacturing). Core return shipping is arranged at our expense.