The CAT 3306 truck engine is a diesel-powered engine produced by Caterpillar Inc. It was first introduced in 1973 and remained in production until 1994. The engine was primarily designed for use in heavy-duty trucks, including dump trucks, garbage trucks, and logging trucks.
The 3306 engine is a six-cylinder engine with a displacement of 10.5 liters (638 cubic inches). It features a turbocharged design with direct fuel injection and an air-to-air aftercooler, which provides improved engine efficiency and performance.
Over the years, the 3306 engine underwent several updates and improvements to enhance its performance and reliability. In 1986, for example, the engine was updated with a new cylinder head design, which improved combustion efficiency and reduced emissions.
The CAT 3306 engine was known for its durability and reliability, and it remains a popular choice among truck enthusiasts and heavy equipment operators. Although it is no longer in production, many of these engines continue to operate in trucks and other heavy equipment around the world.
Specifications for the CAT 3306 engine:
| Engine Type | Inline 6-Cylinder |
|---|---|
| Displacement | 10.5 liters (638 cubic inches) |
| Bore x Stroke | 4.33 in x 5.00 in |
| Compression Ratio | 16.0:1 |
| Valvetrain | OHV (Overhead Valve) |
| Fuel Delivery | Direct Injection |
| Horsepower | 270-350 hp @ 2,200 rpm |
| Torque | 800-1350 lb-ft @ 1,400 rpm |
| Block Material | Cast Iron |
| Cylinder Head Material | Cast Iron |
| Firing Order | 1-5-3-6-2-4 |
| Engine Weight | Approx. 1,680 lbs |
| Recommended Fuel | Diesel |
| Recommended Oil | 15W-40 |
| Maximum Engine Speed | 2,200 rpm |
| Applications | Off-highway trucks, wheel loaders, and other heavy equipment |
| Governor Type | Mechanical or Electronic |
| Air Intake System | Turbocharged, with air-to-air aftercooling |
| Cooling System | Liquid-cooled, with pressurized radiator and belt-driven fan |
| Lubrication System | Gear-driven pump, full-flow and bypass filters |
| Fuel System | Unit injection, with mechanical or electronic controls |
| Fuel Injection Pump | Bosch P3000 or P7100 |
| Fuel Injectors | Caterpillar HEUI (Hydraulically-actuated, Electronically-controlled, Unit-injector) |
| Exhaust System | Wet manifold, with turbocharger and optional muffler |
| Electrical System | 12-volt, negative ground |
| Starter Motor | Electric, with 24-volt option |
| Alternator | 24-volt, with optional 12-volt or 32-volt |
| Emissions Control | None (for off-highway use only) |
CAT 3306 engine oil specifications
| Engine Model | CAT 3306 |
|---|---|
| Oil Capacity (Including filter) | 19.4 liters (20.5 US quarts) |
| Recommended Oil Type | SAE 15W-40 CJ-4 |
| Oil Change Interval | 250 hours or 6 months, whichever comes first |
| Oil Filter Type | Standard Spin-on Filter (Part number 1R-0739) |
It’s important to note that these specifications are for reference only, and it’s always best to consult your engine’s manual or a certified mechanic for specific maintenance guidelines based on your usage and operating conditions.
Fuel consumption
The fuel consumption of the CAT 3306 engine can vary depending on several factors such as vehicle weight, driving conditions, and modifications. However, here are the estimated fuel consumption ratings for different trucks equipped with the CAT 3306 engine:
- Caterpillar 773B Off-Highway Truck: 7-9 gallons per hour (26-34 liters per hour)
- Caterpillar 785B Off-Highway Truck: 8-11 gallons per hour (30-42 liters per hour)
- Caterpillar 3306 Powered 1980 Ford LNT8000 Truck: 5.5 mpg (21 liters per 100 kilometers)
It’s important to note that actual fuel consumption can vary depending on individual driving habits and conditions, and may be affected by factors such as traffic congestion, driving speed, and vehicle maintenance. Regular maintenance, including replacing air and fuel filters, can help ensure optimal fuel efficiency and performance from the CAT 3306 engine.
Table of the trucks that use the CAT 3306:
| Make | Model | Year Range | Engine Type | Horsepower | Torque | Transmission |
|---|---|---|---|---|---|---|
| Caterpillar | 773B | – | CAT 3306 | 456 hp | 1,678 lb-ft | N/A |
| Caterpillar | 785B | – | CAT 3306 | 860 hp | 2,630 lb-ft | N/A |
| Caterpillar | D350D | – | CAT 3306 | 313 hp | 1,126 lb-ft | N/A |
| Caterpillar | D400D | – | CAT 3306 | 365 hp | 1,278 lb-ft | N/A |
| Caterpillar | 776C | – | CAT 3306 | 395 hp | 1,405 lb-ft | N/A |
| GMC | Brigadier | 1978-1988 | CAT 3306 | 210-350 hp | 606-1,170 lb-ft | 5 or 10-speed manual, 3 or 4-speed automatic |
| Ford | L-Series | 1970-1998 | CAT 3306 | 170-350 hp | 525-1,170 lb-ft | 5 or 10-speed manual, 3 or 4-speed automatic |
| International Harvester | Paystar 5000 | 1973-1995 | CAT 3306 | 175-330 hp | 520-1,150 lb-ft | 5 or 10-speed manual, 3 or 4-speed automatic |
The CAT 3306 engine was primarily used in heavy-duty trucks and construction equipment manufactured by Caterpillar, including the 773B and 785B off-highway trucks, as well as the D350D, D400D, and 776C articulated trucks. It was also used in trucks from other manufacturers, including the GMC Brigadier, Ford L-Series, and International Harvester Paystar 5000.
The horsepower and torque ratings for the CAT 3306 engine varied depending on the application and year of production, but generally ranged from 170 to 860 horsepower and 520 to 2,630 lb-ft of torque. These trucks were typically equipped with manual or automatic transmissions with a range of gears to handle heavy loads.
Maintenance
The CAT 3306 engine maintenance table intervals and costs:
- Oil and Filter Change: The oil and filter should be changed every 250 hours or 6 months, whichever comes first. The estimated cost for this maintenance task is typically between $100 and $200, depending on the type of oil and filter used.
- Fuel Filter Change: The fuel filter should be changed every 500 hours or 12 months, whichever comes first. The estimated cost for this maintenance task is typically between $50 and $100, depending on the type of filter used.
- Air Filter Change: The air filter should be changed every 1000 hours or 24 months, whichever comes first. The estimated cost for this maintenance task is typically between $50 and $100, depending on the type of filter used.
- Valve Lash Adjustment: The valve lash should be checked and adjusted every 3000 hours or 3 years, whichever comes first. The estimated cost for this maintenance task is typically between $500 and $1000, depending on the labor rates.
- Cooling System Flush: The cooling system should be flushed every 2000 hours or 4 years, whichever comes first. The estimated cost for this maintenance task is typically between $200 and $400, depending on the type of coolant and labor rates.
- Turbocharger Inspection: The turbocharger should be inspected every 2000 hours or 4 years, whichever comes first. The estimated cost for this maintenance task is typically between $500 and $1000, depending on the labor rates.
- Fan Belt Replacement: The fan belt should be replaced every 2000 hours or 4 years, whichever comes first. The estimated cost for this maintenance task is typically between $100 and $200, depending on the type of belt and labor rates.
- Water Pump Replacement: The water pump should be replaced every 4000 hours or 8 years, whichever comes first. The estimated cost for this maintenance task is typically between $500 and $1000, depending on the labor rates.
- Injector Replacement: The injectors should be replaced every 6000 hours or 12 years, whichever comes first. The estimated cost for this maintenance task is typically between $1000 and $2000, depending on the labor rates and the number of injectors being replaced.
Again, please note that these are estimated costs and can vary based on several factors, including location, labor rates, and parts availability. It’s best to consult with a certified mechanic or service technician to get an accurate estimate for your specific CAT 3306 engine maintenance needs.
CAT 3306 engine problems
The CAT 3306 engine is a reliable and durable engine, but like any engine, it can experience problems over time. Some common CAT 3306 engine problems include:
- Oil Leaks: The engine can develop oil leaks over time due to worn gaskets or seals.
- Fuel Problems: Fuel contamination or injector failure can cause issues with the engine’s performance and fuel efficiency.
- Overheating: Overheating can occur if the engine is run at high loads for extended periods, or if the cooling system is not working properly.
- Turbocharger Failure: The turbocharger can fail due to oil contamination or worn bearings.
- Starting Problems: Issues with the starter motor, battery, or electrical system can cause problems with starting the engine.
- Cracked Cylinder Head: Overheating or improper maintenance can cause the cylinder head to crack, leading to engine failure.
- Low Compression: Low compression can be caused by worn piston rings, cylinder walls, or valves.
It’s important to address any problems with the CAT 3306 engine as soon as possible to avoid further damage and costly repairs. Regular maintenance and inspections can help prevent many of these issues from occurring in the first place.
Costs for different CAT 3306 engine rebuild and repair kits
A table with estimated costs for different CAT 3306 engine rebuild and repair kits:
| Kit Type | Description | Estimated Cost |
|---|---|---|
| Engine Rebuild Kit | Includes all parts necessary to rebuild the engine, such as pistons, rings, bearings, gaskets, and seals. | $2000 – $4000 |
| Engine Overhaul Kit | Includes all parts necessary to overhaul the engine, such as pistons, rings, bearings, gaskets, seals, and timing components. | $2500 – $5000 |
| Head Gasket Kit | Includes all gaskets necessary for replacing the cylinder head, such as head gasket, valve cover gasket, and intake/exhaust manifold gaskets. | $200 – $400 |
| Jake Brake Kit | Includes all parts necessary for installing a Jake Brake, such as the brake housing, solenoid valve, and wiring harness. | $1500 – $3000 |
Please note that these are estimated costs and can vary depending on the specific kit, brand, and supplier. It’s important to research and compare different options to find the best value for your needs. Additionally, installation costs may vary depending on labor rates and other factors.
Price
An estimated price table for the CAT 3306 engine. Please note that the prices can vary depending on the location, condition, and availability.
| Type of Engine | Price Range | Description |
|---|---|---|
| New Engine | $18,000 – $25,000 | Brand new engine with full warranty from CAT |
| Used Engine | $5,000 – $12,000 | Pre-owned engine in working condition |
| Remanufactured Engine | $10,000 – $15,000 | Rebuilt engine by a third-party with a warranty |
| Cost of Replacement | $8,000 – $20,000 | Cost to replace the engine, including labor costs |
Please keep in mind that these prices are estimates and are subject to change based on the specific engine and location. Additionally, the cost of replacement may vary depending on the extent of damage and the amount of labor required for the installation. It is recommended to consult with a certified mechanic or CAT dealership for accurate pricing and information.
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