The Arctic Cat T660 Turbo, with its smooth four-stroke engine and promise of boosted performance, was a game-changer when it hit the snow. However, like any complex machine, it's not without its quirks. Understanding the common problems that can plague these sleds is crucial for owners looking to keep them running strong for years to come, so let's dive into the common issues and how to tackle them.

What’s That Funny Noise? Common T660 Turbo Issues

Over the years, some recurring problems have emerged as common headaches for T660 Turbo owners. These range from relatively minor annoyances to more serious mechanical concerns. Knowing what to listen and look for can save you a lot of time, money, and frustration down the trail.

Turbocharger Troubles: As the heart of the performance enhancement, the turbocharger is a frequent suspect when things go wrong.

  • Boost Leaks: One of the most common issues is boost leaks. These leaks can occur in the hoses connecting the turbocharger to the engine, the intercooler, or the intake manifold. A telltale sign is a noticeable decrease in power, especially at higher speeds. You might also hear a hissing sound under acceleration. Carefully inspect all hoses and connections for cracks, looseness, or damage. Tightening clamps or replacing worn hoses can often resolve the problem.
  • Turbo Lag: Some owners experience excessive turbo lag, the delay between hitting the throttle and feeling the boost kick in. While some lag is inherent in turbo systems, excessive lag can indicate a problem. This could be due to a malfunctioning wastegate (which controls boost pressure), a clogged air filter restricting airflow to the turbo, or even issues with the engine's fuel delivery system. Cleaning or replacing the air filter is a simple first step. If the problem persists, professional diagnosis of the wastegate and fuel system is recommended.
  • Turbo Failure: In more severe cases, the turbocharger itself can fail. This can be caused by oil starvation, overheating, or simply wear and tear over time. Signs of turbo failure include excessive smoke (especially blue smoke, indicating burning oil), unusual noises (whining, grinding), and a complete loss of boost. Unfortunately, turbocharger replacement or rebuild is often the only solution in these situations.

Fuel System Foibles: A healthy fuel system is essential for optimal performance.

  • Fuel Pump Issues: The T660 Turbo relies on a fuel pump to deliver adequate fuel to the injectors. Over time, the fuel pump can weaken or fail, leading to fuel starvation, especially under high-load conditions. Symptoms include difficulty starting, rough idling, hesitation during acceleration, and stalling. Checking fuel pressure is a key diagnostic step. If the fuel pressure is below specifications, the fuel pump likely needs to be replaced.
  • Injector Problems: Fuel injectors can become clogged or malfunction, leading to poor fuel atomization and incomplete combustion. This can result in rough running, poor fuel economy, and reduced power. Fuel injector cleaning or replacement may be necessary.
  • Fuel Line Issues: Fuel lines can become brittle and cracked with age, leading to fuel leaks. Visually inspect the fuel lines for any signs of damage and replace them as needed. Always use fuel-grade hoses.

Electrical Gremlins: Electrical problems can be particularly frustrating to diagnose.

  • Stator Failure: The stator is responsible for generating the electricity needed to power the engine and electrical components. Stator failure can lead to a variety of problems, including difficulty starting, poor performance, and a dead battery. Testing the stator with a multimeter is the best way to determine if it's functioning properly.
  • Wiring Harness Issues: The wiring harness can be susceptible to damage from vibration, moisture, and rodent activity. Damaged wires can cause shorts, open circuits, and intermittent electrical problems. Carefully inspect the wiring harness for any signs of damage and repair or replace damaged sections as needed. Using dielectric grease on electrical connections can help prevent corrosion.
  • Sensor Malfunctions: The T660 Turbo relies on a variety of sensors to monitor engine performance. A malfunctioning sensor can provide incorrect data to the engine control unit (ECU), leading to poor performance. Using a diagnostic scanner to read sensor data can help identify malfunctioning sensors.

Cooling System Concerns: Overheating can cause serious engine damage.

  • Coolant Leaks: Coolant leaks can lead to overheating and engine damage. Inspect all hoses, connections, and the water pump for any signs of leaks. Repair or replace leaking components as needed.
  • Water Pump Failure: The water pump circulates coolant through the engine to keep it cool. Water pump failure can lead to overheating. Listen for unusual noises coming from the water pump and check for coolant leaks around the pump.
  • Radiator Issues: The radiator can become clogged with debris, reducing its ability to dissipate heat. Clean the radiator fins regularly to ensure proper airflow.

Other Potential Problems:

  • Exhaust Leaks: Exhaust leaks can reduce performance and increase noise levels. Inspect the exhaust system for any signs of leaks and repair or replace damaged components.
  • Clutch Issues: The clutch is responsible for transferring power from the engine to the track. Clutch problems can lead to poor acceleration, belt slippage, and reduced top speed. Inspect the clutch components for wear and tear and replace them as needed.
  • Suspension Problems: Suspension problems can affect handling and ride quality. Inspect the suspension components for wear and tear and replace them as needed.

Proactive Maintenance: Keeping Your T660 Turbo Happy

The best way to avoid these problems is through proactive maintenance. Regular maintenance can help prevent problems before they occur and extend the life of your T660 Turbo.

  • Regular Oil Changes: Changing the oil regularly is crucial for keeping the engine running smoothly. Follow the manufacturer's recommendations for oil type and change intervals.
  • Air Filter Cleaning: A clean air filter is essential for proper engine performance. Clean or replace the air filter regularly.
  • Spark Plug Replacement: Replace the spark plugs at the recommended intervals.
  • Coolant Flush: Flush the cooling system and replace the coolant every two years.
  • Greasing: Grease all of the grease fittings regularly.
  • Visual Inspections: Regularly inspect the sled for any signs of damage or wear.
  • Storage: Properly store the sled during the off-season.

Troubleshooting Tips: Diagnosing the Issue

When problems do arise, a systematic approach to troubleshooting is essential.

  1. Gather Information: Start by gathering as much information as possible about the problem. When did the problem start? What are the symptoms? What were you doing when the problem occurred?
  2. Visual Inspection: Perform a thorough visual inspection of the sled, looking for any obvious signs of damage or wear.
  3. Diagnostic Tools: Use diagnostic tools, such as a multimeter or a diagnostic scanner, to help identify the problem.
  4. Consult the Service Manual: The service manual contains valuable information about troubleshooting and repairing the T660 Turbo.
  5. Seek Professional Help: If you're not comfortable working on the sled yourself, seek professional help from a qualified mechanic.

DIY vs. Professional Repair: When to Call in the Experts

Knowing when to tackle a repair yourself and when to seek professional help is crucial. Simple tasks like changing the oil, cleaning the air filter, and replacing spark plugs are often within the capabilities of most owners. However, more complex repairs, such as turbocharger rebuilds, fuel system diagnostics, and electrical troubleshooting, are best left to experienced technicians. Attempting repairs beyond your skill level can lead to further damage and increased costs.

Finding Parts: Where to Get What You Need

Finding the right parts for your T660 Turbo is essential for proper repairs. Arctic Cat dealers are the best source for genuine Arctic Cat parts. However, aftermarket parts are also available from a variety of sources. When purchasing aftermarket parts, be sure to choose reputable brands and verify that the parts are compatible with your sled. Online retailers and salvage yards can also be good sources for parts.

Frequently Asked Questions

  • Why is my T660 Turbo losing power? Power loss can be caused by several factors, including boost leaks, fuel system problems, or a malfunctioning turbocharger. Start by inspecting the hoses and connections for leaks.
  • Why is my T660 Turbo hard to start? Hard starting can be due to a weak fuel pump, clogged fuel injectors, or a faulty stator. Check the fuel pressure and spark plugs first.
  • Why is my T660 Turbo overheating? Overheating can be caused by coolant leaks, a malfunctioning water pump, or a clogged radiator. Inspect the cooling system for leaks and debris.
  • Where can I find a service manual for my T660 Turbo? Service manuals are available from Arctic Cat dealers or online retailers. Having a service manual is crucial for proper maintenance and repair.
  • How often should I change the oil in my T660 Turbo? Refer to your owner's manual for the recommended oil change interval. Typically, it's every 500-1000 miles, or at least once a year.

The Ride Ahead

Owning an Arctic Cat T660 Turbo can be a rewarding experience, but it's essential to be aware of the potential problems and how to address them. By understanding the common issues, performing regular maintenance, and knowing when to seek professional help, you can keep your T660 Turbo running strong for many years to come. Remember, a little preventative care goes a long way in maximizing your snowmobiling fun!