The Arctic Cat 700 Diesel ATV, once touted for its fuel efficiency and rugged performance, has unfortunately gained a reputation for experiencing a range of issues that can leave owners frustrated. While the diesel engine offered a unique selling point, the complexities and specific design choices have resulted in problems that are more prevalent than with some of its gasoline-powered counterparts. Understanding these common problems is crucial for potential buyers and current owners alike, allowing for informed decisions and proactive maintenance to mitigate potential headaches.

So, What's the Deal with These Arctic Cat 700 Diesels?

The Arctic Cat 700 Diesel was an attempt to cater to a specific market segment needing a powerful, fuel-efficient ATV, particularly in agricultural or industrial settings. The allure of diesel – lower fuel consumption, longer engine life (in theory), and the ability to run on alternative fuels – was strong. However, the reality has often fallen short of these expectations. The key issues tend to revolve around the engine itself, the fuel system, and some electrical gremlins.

Common Culprits: Engine and Fuel System Woes

Fuel Injector Problems: This is arguably the most frequently reported issue. The injectors in the Arctic Cat 700 Diesel seem particularly sensitive to fuel quality and can become clogged relatively easily. Symptoms include:

  • Rough idling: The engine may struggle to maintain a smooth idle, often surging or sputtering.
  • Hard starting: Getting the engine to fire up, especially in cold weather, can become a real chore.
  • Loss of power: The ATV might feel sluggish and lack its usual punch, especially under load.
  • Excessive smoke: Black smoke from the exhaust is a classic sign of incomplete combustion due to faulty injectors.

The fix? Often, cleaning the injectors using a specialized ultrasonic cleaner can help. However, in many cases, replacement is necessary. Using high-quality diesel fuel and adding a fuel additive designed to clean injectors can help prevent future issues.

Fuel Pump Failures: Another common complaint centers around the fuel pump. The pump is responsible for delivering fuel from the tank to the injectors at the correct pressure. When it fails, the engine is starved of fuel, leading to:

  • Engine stalling: The engine may suddenly cut out, especially when accelerating or under load.
  • Inconsistent performance: The ATV might run fine one minute and then sputter and die the next.
  • No start: The engine simply won't start, even with a fully charged battery.

Fuel pump failures can be caused by a number of factors, including debris in the fuel tank, overheating, and general wear and tear. Replacement is usually the only option. Regularly inspecting and cleaning the fuel tank, as well as replacing the fuel filter, can help extend the life of the fuel pump.

Glow Plug Issues: Diesel engines rely on glow plugs to preheat the combustion chamber, especially in cold weather. If the glow plugs are faulty, the engine will be difficult or impossible to start when it's cold. Symptoms include:

  • Hard starting in cold weather: This is the most obvious sign. The engine may crank for a long time without firing.
  • Excessive white smoke on startup: White smoke indicates unburned fuel, which is often a result of insufficient heat in the combustion chamber.

Testing the glow plugs with a multimeter is the easiest way to diagnose this problem. Replacement is a relatively straightforward process. Ensuring the battery is in good condition is also crucial, as weak batteries can struggle to provide enough power to the glow plugs.

Valve Problems: Some owners have reported issues with valves, including burnt or bent valves. This can lead to:

  • Loss of compression: The engine will have reduced power and may be difficult to start.
  • Ticking or knocking noises: Unusual sounds coming from the engine are often a sign of valve problems.
  • Poor fuel economy: Inefficient combustion can lead to increased fuel consumption.

Valve problems can be caused by a number of factors, including improper valve adjustment, overheating, and using low-quality oil. A compression test can help diagnose this issue. Repairing valve problems often requires removing the cylinder head and performing extensive engine work. Regularly checking and adjusting the valves according to the manufacturer's specifications is crucial for preventing these issues.

Electrical Gremlins: More Than Just a Nuisance

Beyond the engine and fuel system, the Arctic Cat 700 Diesel can also suffer from electrical problems. These can be particularly frustrating because they can be difficult to diagnose and fix.

Wiring Harness Issues: The wiring harness is the backbone of the ATV's electrical system. If the wiring is damaged or corroded, it can cause a variety of problems, including:

  • Intermittent electrical problems: Lights may flicker, gauges may stop working, or the engine may suddenly cut out.
  • Difficulty starting: A bad connection in the wiring harness can prevent the engine from getting the power it needs to start.
  • Battery drain: A short circuit in the wiring harness can drain the battery, even when the ATV is not in use.

Carefully inspecting the wiring harness for damage, corrosion, and loose connections is the first step in diagnosing this problem. Using a multimeter to test for continuity and voltage can help pinpoint the exact location of the fault. Protecting the wiring harness from the elements and regularly cleaning connections can help prevent these issues.

Sensor Failures: The Arctic Cat 700 Diesel relies on a number of sensors to monitor engine performance and control various systems. If a sensor fails, it can cause a variety of problems, including:

  • Poor engine performance: The engine may run rough, lack power, or stall.
  • Check engine light: The check engine light will illuminate, indicating that there is a problem with the engine.
  • Incorrect readings on the gauges: The gauges may display inaccurate information, such as the engine temperature or fuel level.

Using a diagnostic scanner to read the error codes stored in the ATV's computer is the best way to diagnose sensor failures. Replacement is usually the only option. Ensuring the sensors are properly connected and protected from damage can help prevent these issues.

Charging System Problems: The charging system is responsible for keeping the battery charged and providing power to the ATV's electrical components. If the charging system fails, the battery will eventually die, and the ATV will not start. Symptoms include:

  • Weak battery: The battery may not hold a charge or may drain quickly.
  • Dim lights: The lights may be dim, especially when the engine is idling.
  • Difficulty starting: The engine may be difficult to start, especially after the ATV has been sitting for a while.

Testing the charging system with a multimeter can help determine if the alternator, voltage regulator, or battery is faulty. Replacement of the faulty component is usually necessary. Regularly checking the battery terminals for corrosion and ensuring the charging system components are properly connected can help prevent these issues.

Beyond the Mechanical: Other Considerations

It's not just about the mechanical and electrical components. Other factors can contribute to problems with the Arctic Cat 700 Diesel.

Poor Maintenance: Neglecting regular maintenance, such as oil changes, filter replacements, and valve adjustments, can significantly shorten the lifespan of the engine and increase the risk of problems. Following the manufacturer's recommended maintenance schedule is crucial for keeping the ATV in good working order.

Harsh Operating Conditions: Using the ATV in extreme conditions, such as mud, water, or dust, can put a strain on the engine and other components. Taking precautions to protect the ATV from the elements and performing regular cleaning can help mitigate these effects.

Lack of Proper Storage: Storing the ATV improperly, such as leaving it outside in the elements or allowing it to sit for long periods without being used, can also lead to problems. Storing the ATV in a dry, sheltered location and using a fuel stabilizer can help prevent these issues.

Frequently Asked Questions

  • Why do the fuel injectors clog so easily? The injectors are sensitive to fuel quality. Using high-quality fuel and additives can help.
  • Is the Arctic Cat 700 Diesel reliable? Reliability is questionable. Many owners report frequent issues, especially with the fuel system.
  • Can I convert it to run on gasoline? Technically possible, but very complex and expensive, and not recommended.
  • Are parts readily available? Parts availability can be a challenge, especially for specific diesel components.
  • Is it difficult to work on? Diesel engines are more complex than gasoline engines, requiring specialized knowledge.

The Bottom Line

While the Arctic Cat 700 Diesel offered a unique proposition, its reputation for reliability is less than stellar. Understanding the common problems associated with this ATV is vital for both potential buyers and current owners. Proactive maintenance and careful operation are key to minimizing issues and maximizing the lifespan of this unique, yet often problematic, machine. Consider your needs and weigh the potential issues before purchasing.