Briggs and Stratton 675ex Engine Repair Tips (5 Splitter Fixes)

Introduction: The Unstoppable Briggs & Stratton 675ex – And How to Keep It That Way

Let’s face it, the Briggs & Stratton 675ex engine is a workhorse. I’ve seen these engines powering everything from lawnmowers to, most importantly for our discussion, wood splitters, and they just keep chugging along. Their reputation for durability is well-earned. However, even the toughest engines need a little TLC now and then. As someone who’s spent years wrestling with logs and coaxing firewood from stubborn rounds, I’ve learned a thing or two about keeping these engines purring. In this article, I’ll share my hard-won knowledge, focusing on five common problems I’ve encountered with the 675ex on wood splitters, and how to fix them. Think of this as your troubleshooting guide, seasoned with a bit of real-world experience.

Five Common Briggs & Stratton 675ex Wood Splitter Fixes

The Briggs & Stratton 675ex engine is known for its reliability, but like any mechanical device, it can experience problems. Here are five common issues I’ve encountered on wood splitters, along with detailed troubleshooting and repair steps.

1. The Stubborn Starter: When Your Engine Refuses to Crank

There’s nothing more frustrating than pulling the starter cord repeatedly and getting nothing but silence. This is a common issue, and thankfully, usually a relatively simple fix.

• The Culprit: Low Oil Level

  • Why it matters: Many small engines have a low-oil sensor that prevents them from starting to protect the engine from damage. This is a fantastic feature that can save you from catastrophic engine failure.
  • The fix: Check the oil level using the dipstick. Make sure the engine is on a level surface. If the oil is low, add the recommended type of oil (usually SAE 30 or 10W-30, but always consult your owner’s manual). I always keep a quart or two of oil specifically for my splitter on hand. It’s a quick check and an even quicker fix.
  • Personal Experience: I remember one sweltering summer day, I was splitting a massive pile of oak. The splitter sputtered and died, and I thought the worst. After a quick check, the oil was bone dry. The sensor did its job! A little oil, and she roared back to life. Saved me a ton of money.

• The Culprit: Fouled Spark Plug

  • Why it matters: The spark plug ignites the fuel-air mixture in the cylinder. A fouled or damaged spark plug won’t produce a strong enough spark, preventing the engine from starting.
  • The fix: Remove the spark plug. Inspect it for carbon buildup, cracks, or damage. Clean the plug with a wire brush or spark plug cleaner. If it’s heavily fouled or damaged, replace it with a new one. Ensure the spark plug gap is correct (refer to your owner’s manual for the proper gap setting; a typical gap is around 0.030 inches). A spark plug gap tool makes this easy. I recommend keeping a spare spark plug in your toolbox.
  • Data Point: Replacing a spark plug is one of the most common small engine repairs. Studies have shown that a clean and properly gapped spark plug can improve fuel efficiency by up to 4%.

• The Culprit: Dirty Air Filter

  • Why it matters: A dirty air filter restricts airflow to the engine, affecting the fuel-air mixture and making it difficult to start.
  • The fix: Remove the air filter. Inspect it for dirt and debris. If it’s a foam filter, wash it with soap and water, squeeze out the excess water, and let it dry completely. If it’s a paper filter, gently tap it to remove loose dirt. If the filter is heavily soiled or damaged, replace it.
  • Pro Tip: I often keep two air filters on hand. While one is drying, I can install the other and keep working. This minimizes downtime.
  • Wood Processing Insight: Certain wood species, like pine, can produce a lot of fine sawdust, which quickly clogs air filters. If you’re processing pine frequently, check your air filter more often.

• The Culprit: Fuel Issues

  • Why it matters: Stale fuel, a clogged fuel line, or a malfunctioning fuel shut-off valve can prevent fuel from reaching the engine.
  • The fix: First, ensure the fuel shut-off valve is open. Next, check the fuel line for any kinks or blockages. If the fuel is old (over 30 days), drain the fuel tank and carburetor and replace it with fresh fuel. Adding a fuel stabilizer can help prevent fuel from going bad.
  • Personal Story: I once spent hours trying to diagnose a starting problem, only to realize I’d forgotten to open the fuel shut-off valve! Don’t overlook the simple things.
  • Unique Insight: Ethanol-blended gasoline is notorious for causing problems in small engines. Ethanol can absorb water, leading to corrosion and fuel separation. I always use ethanol-free fuel in my small engines, especially if they’re going to be stored for an extended period.

2. The Sputtering Engine: When Your Splitter Runs Rough

A sputtering engine indicates an inconsistent fuel-air mixture, which can drastically reduce the efficiency of your wood splitter.

• The Culprit: Clogged Carburetor

  • Why it matters: The carburetor mixes air and fuel in the correct proportions for combustion. A clogged carburetor can disrupt this delicate balance, causing the engine to sputter, stall, or run poorly.
  • The fix: The most effective solution is to clean the carburetor. You can try using carburetor cleaner spray to dissolve deposits. If that doesn’t work, you may need to disassemble the carburetor and clean each component individually. This requires some mechanical skill and a repair manual.
  • Step-by-Step Carburetor Cleaning (Simplified):
    1. Disconnect the fuel line and remove the carburetor from the engine.
    2. Carefully disassemble the carburetor, noting the location of each part.
    3. Soak the carburetor body and components in carburetor cleaner.
    4. Use a small wire or carburetor cleaning brush to remove any stubborn deposits.
    5. Rinse the parts with clean fuel and allow them to dry.
    6. Reassemble the carburetor, ensuring all parts are properly seated.
    7. Reinstall the carburetor on the engine and reconnect the fuel line.
  • Caution: When disassembling the carburetor, be extremely careful not to lose any small parts, such as jets, needles, and springs. It’s a good idea to take pictures as you disassemble it.
  • Data Point: Carburetor cleaning is a common repair for small engines. Studies have shown that a clean carburetor can improve engine performance by up to 15%.
  • Wood Species Tip: When processing resinous woods like pine or cedar, the fine particles can easily clog the carburetor. Regular cleaning is essential.

• The Culprit: Loose or Damaged Fuel Lines

  • Why it matters: Loose or damaged fuel lines can allow air to enter the fuel system, causing the engine to sputter.
  • The fix: Inspect the fuel lines for cracks, leaks, or loose connections. Replace any damaged fuel lines. Ensure all connections are secure.
  • Actionable Takeaway: Always use fuel lines specifically designed for small engines. Automotive fuel lines may not be compatible with the fuel used in small engines.

3. The Power Loss: When Your Splitter Struggles with Tough Logs

A noticeable loss of power can make splitting even moderately sized logs a frustrating experience.

• The Culprit: Low Hydraulic Fluid

  • Why it matters: The hydraulic system powers the splitting ram. Low hydraulic fluid levels reduce the pressure available, resulting in reduced splitting force.
  • The fix: Check the hydraulic fluid level in the reservoir. Add hydraulic fluid as needed, using the type recommended by the manufacturer. Inspect the hydraulic system for leaks.
  • Data Point: Maintaining proper hydraulic fluid levels is crucial for the longevity of your wood splitter. Low fluid levels can cause the pump to overheat and fail.
  • Unique Insight: Over time, hydraulic fluid can become contaminated with moisture and debris, reducing its effectiveness. I recommend changing the hydraulic fluid every 100-200 hours of operation.

• The Culprit: Worn or Damaged Hydraulic Pump

  • Why it matters: The hydraulic pump generates the pressure needed to operate the splitting ram. A worn or damaged pump will not produce sufficient pressure, resulting in a loss of splitting force.
  • The fix: This is a more complex repair that may require specialized tools and knowledge. If you suspect a problem with the hydraulic pump, consult a qualified mechanic.
  • Warning: Working with hydraulic systems can be dangerous. Always relieve the pressure in the system before attempting any repairs.
  • Alternative Solution: Consider replacing the entire hydraulic pump assembly. This can be a more cost-effective option than repairing the existing pump.

• The Culprit: Dull Splitting Wedge

  • Why it matters: A dull splitting wedge requires more force to split logs, putting extra strain on the engine and hydraulic system.
  • The fix: Sharpen the splitting wedge using a file or grinder. Be careful not to overheat the metal, as this can weaken it.
  • Pro Tip: I often use a flap disc sander on an angle grinder to sharpen my splitting wedge. It’s quick and effective.
  • Wood Durability Insight: Hardwoods like oak and maple require a sharper splitting wedge than softwoods like pine.

4. The Overheating Engine: When Your Splitter Gets Too Hot to Handle

An overheating engine is a serious problem that can lead to permanent damage.

• The Culprit: Insufficient Cooling

  • Why it matters: The engine relies on air circulation to dissipate heat. Blocked cooling fins or a malfunctioning cooling fan can prevent the engine from cooling properly.
  • The fix: Clean the cooling fins on the engine. Remove any debris that may be blocking airflow. Ensure the cooling fan is operating correctly.
  • Personal Experience: I once spent a hot afternoon splitting wood with my splitter. It started to overheat, and I noticed that the cooling fins were completely clogged with sawdust. A quick cleaning solved the problem.
  • Actionable Takeaway: Regularly inspect and clean the cooling fins on your engine, especially if you’re working in dusty conditions.

• The Culprit: Low Oil Level (Again!)

  • Why it matters: As mentioned earlier, low oil levels can prevent the engine from starting. They can also cause the engine to overheat due to increased friction.
  • The fix: Double-check the oil level. If it’s low, add the recommended type of oil.
  • Important Note: Overfilling the engine with oil can also cause problems. Always follow the manufacturer’s recommendations.

• The Culprit: Incorrect Engine Timing

  • Why it matters: Incorrect engine timing can cause the engine to run hotter than normal.
  • The fix: This is a more complex repair that may require specialized tools and knowledge. If you suspect a problem with the engine timing, consult a qualified mechanic.

5. The Leaky Splitter: When Your Machine is Leaving a Mess

Leaks, whether fuel or hydraulic fluid, are not only messy but also indicative of underlying problems that need immediate attention.

• The Culprit: Damaged Fuel Lines or Tank

  • Why it matters: Cracks, punctures, or loose connections in the fuel system can lead to fuel leaks.
  • The fix: Carefully inspect the fuel lines, fuel tank, and carburetor for any signs of damage. Replace any damaged components. Ensure all connections are tight.
  • Safety First: Fuel leaks are a fire hazard. Always handle fuel with care and ensure proper ventilation.

• The Culprit: Worn or Damaged Hydraulic Hoses or Fittings

  • Why it matters: Hydraulic hoses and fittings can wear out over time, leading to leaks.
  • The fix: Inspect the hydraulic hoses and fittings for cracks, leaks, or damage. Replace any damaged components. Ensure all connections are secure.
  • Professional Tip: When replacing hydraulic hoses, use hoses specifically designed for high-pressure hydraulic systems. Automotive hoses are not suitable.

• The Culprit: Worn Seals or O-Rings

  • Why it matters: Seals and O-rings are used to prevent leaks in various parts of the hydraulic system. Over time, these components can dry out, crack, or become damaged, leading to leaks.
  • The fix: Identify the source of the leak. Replace the worn or damaged seals or O-rings.
  • Case Study: I once had a hydraulic leak on my wood splitter that I couldn’t pinpoint. After a thorough inspection, I discovered that a small O-ring on the hydraulic cylinder was cracked. Replacing the O-ring solved the problem.
  • Cost-Effectiveness: Replacing seals and O-rings is a relatively inexpensive repair that can prevent more serious damage to the hydraulic system.

Beyond the Fixes: Preventative Maintenance for Your 675ex

Repairing your Briggs & Stratton 675ex engine is important, but preventing problems in the first place is even better. Here are some preventative maintenance tips that will keep your wood splitter running smoothly for years to come:

• Regular Oil Changes: Change the engine oil regularly, following the manufacturer’s recommendations. This will help to keep the engine clean and lubricated.
• Air Filter Maintenance: Clean or replace the air filter regularly. A clean air filter will ensure that the engine receives the proper amount of air.
• Fuel System Maintenance: Use fresh fuel and add a fuel stabilizer to prevent fuel from going bad. Clean the carburetor regularly.
• Hydraulic System Maintenance: Check the hydraulic fluid level regularly and add fluid as needed. Change the hydraulic fluid every 100-200 hours of operation. Inspect the hydraulic hoses and fittings for leaks.
• Proper Storage: When storing your wood splitter for an extended period, drain the fuel tank and carburetor. This will prevent fuel from going bad and clogging the carburetor.

Understanding Wood and Processing: A Deeper Dive

While engine maintenance is crucial, understanding the wood you’re processing and the techniques you use is equally important for maximizing efficiency and safety.

• Wood Species and Splitting Ease: Different wood species have different splitting characteristics. Softwoods like pine and fir are generally easier to split than hardwoods like oak and maple. Knowing the type of wood you’re working with can help you adjust your splitting technique and choose the right tools.
  • Data Point: Softwoods typically have a lower density than hardwoods, making them easier to split. The density of wood is measured in pounds per cubic foot (PCF). Softwoods typically have a density of 20-30 PCF, while hardwoods can range from 35-50 PCF or higher.
• Splitting Techniques: There are several different splitting techniques you can use, depending on the size and shape of the log. For small logs, you can use a single-stroke splitting technique. For larger logs, you may need to use a multi-stroke technique, splitting the log into smaller pieces before splitting it in half.
  • Safety Consideration: Always wear safety glasses and gloves when splitting wood. Use a splitting maul or axe with a sharp blade.
• Wood Seasoning: Seasoning wood before splitting it can make it easier to split and reduce the amount of moisture in the firewood. Seasoning involves allowing the wood to dry for several months, typically under a covered area.
  • Processing Efficiency: Seasoned wood burns more efficiently and produces more heat than green wood.
  • Wood Durability: Seasoning wood can also help to prevent rot and decay.

Global Perspectives on Wood Processing

Wood processing and firewood preparation practices vary significantly around the world, depending on factors such as climate, wood availability, and cultural traditions.

• Scandinavian Countries: In Scandinavian countries, wood is a primary source of heating fuel. Wood processing is often done on a large scale, using advanced machinery and techniques.
• Developing Countries: In many developing countries, wood is still harvested and processed manually, using traditional tools and techniques.
• North America: In North America, wood processing ranges from small-scale, hobbyist operations to large-scale commercial operations.

Conclusion: Keeping Your Splitter (and You) Going Strong

The Briggs & Stratton 675ex engine is a reliable workhorse for wood splitters, but proper maintenance and understanding common issues are essential for keeping it running smoothly. By following the troubleshooting tips and preventative maintenance guidelines outlined in this article, you can ensure that your wood splitter is always ready to tackle the toughest logs. Remember to prioritize safety, understand the wood you’re processing, and adapt your techniques to maximize efficiency. With a little care and attention, your 675ex-powered wood splitter will be a valuable asset for years to come. And who knows, maybe I’ll see you out there, splitting wood and sharing stories of our own engine triumphs and tribulations!

Learn more