Concrete Saw Stihl 420 Rebuild Tips (Expert Woodcutting Guide)

Let’s face it, the allure of a roaring fire is timeless. Whether it’s for warmth, cooking, or simply the ambiance, the ability to process wood efficiently and safely is a skill that connects us to generations past. This guide is about breathing new life into your Stihl TS 420, specifically focusing on rebuild tips with a woodcutting twist, but I’ll also sprinkle in some expert woodcutting wisdom to make the most of its capabilities.

The global firewood market is booming, projected to reach billions of dollars in the coming years. This surge is driven by a renewed interest in sustainable heating solutions and the charm of wood-burning appliances. Similarly, the demand for efficient concrete cutting tools is constantly expanding. Whether you’re a seasoned pro or a weekend warrior, understanding how to maintain and rebuild your tools is crucial.

Understanding the User Intent

The user searching for “Concrete Saw Stihl 420 Rebuild Tips (Expert Woodcutting Guide)” is looking for several things:

• Specific Rebuild Information: Detailed, step-by-step guidance on how to rebuild a Stihl TS 420 concrete saw.
• Woodcutting Applications: Information on how to use the Stihl TS 420 for woodcutting, perhaps in unconventional or emergency situations.
• Expert Advice: Tips and tricks from experienced users on getting the most out of the saw.
• Troubleshooting: Solutions to common problems encountered during rebuilds or woodcutting.

This guide will address all these needs, blending concrete saw expertise with woodcutting knowledge.

The Stihl TS 420: More Than Just Concrete

The Stihl TS 420 is known for its robust power and reliability in cutting concrete, asphalt, and metal. But, with the right modifications and precautions, it can also be used for certain woodcutting tasks. Disclaimer: Using a concrete saw for woodcutting is not the intended use and can be dangerous. Always prioritize safety and use appropriate personal protective equipment (PPE).

My Story: A Concrete Saw’s Woodcutting Adventure

Years ago, during a particularly nasty ice storm, a massive oak limb came crashing down, blocking my driveway. My usual chainsaw was out of commission, and I was stuck. Desperate, I remembered my trusty Stihl TS 420. Armed with a diamond blade I had used for cutting stone, I cautiously started cutting the limb. It was slow and certainly not ideal, but it got the job done. That experience taught me the value of versatility and the importance of knowing your tools inside and out.

Rebuilding Your Stihl TS 420: A Step-by-Step Guide

Rebuilding a Stihl TS 420 can seem daunting, but with patience and the right information, it’s a manageable task. This guide assumes you have basic mechanical knowledge and tools. If not, consider seeking professional help.

1. Safety First: Preparation and Disassembly

• Disconnect the Spark Plug: This is crucial to prevent accidental starting.
• Drain the Fuel Tank: Fuel is flammable and can create a mess.
• Clean the Saw: Remove dirt and debris to prevent contamination during disassembly.
• Gather Your Tools: You’ll need a socket set, screwdrivers, pliers, a torque wrench, and potentially a flywheel puller.
• Take Pictures: Document each step of the disassembly process. This will be invaluable during reassembly.

2. Disassembling the Engine

• Removing the Starter Assembly: This is usually held in place by a few screws. Note the orientation of the recoil spring for reassembly.
• Removing the Carburetor: Disconnect the fuel lines and throttle linkage. Be careful not to damage the carburetor gasket.
• Removing the Cylinder: This typically involves removing four bolts. Inspect the cylinder walls for scoring or damage.
• Removing the Piston: Remove the piston pin retaining clips and push out the piston pin. Inspect the piston for wear and tear.
• Removing the Crankshaft: This requires splitting the engine case. Use a case splitter tool if necessary. Inspect the crankshaft bearings for wear.

3. Inspecting and Replacing Parts

This is where the rebuild truly begins. Thorough inspection is key to a successful rebuild.

• Cylinder: Look for scoring, cracks, or other damage. If the cylinder is damaged, it must be replaced or re-sleeved.
• Piston: Check for wear on the piston skirt and ring grooves. Replace the piston if it’s damaged or worn.
• Piston Rings: Replace the piston rings regardless of their apparent condition. They are a wear item.
• Crankshaft Bearings: Replace the crankshaft bearings if they feel rough or have excessive play.
• Seals: Replace all seals, including the crankshaft seals and the carburetor seals.
• Fuel Lines: Inspect the fuel lines for cracks or deterioration. Replace them if necessary.
• Air Filter: Replace the air filter. A clean air filter is essential for engine performance.
• Spark Plug: Replace the spark plug.
• Carburetor: Clean the carburetor thoroughly. Consider a carburetor rebuild kit.

4. Reassembling the Engine

• Installing the Crankshaft: Lubricate the crankshaft bearings and carefully install the crankshaft into the engine case.
• Installing the Piston: Lubricate the piston and cylinder walls. Install the piston rings onto the piston. Install the piston pin and retaining clips.
• Installing the Cylinder: Install the cylinder onto the engine case. Torque the cylinder bolts to the manufacturer’s specifications.
• Installing the Carburetor: Install the carburetor and connect the fuel lines and throttle linkage.
• Installing the Starter Assembly: Install the starter assembly, ensuring the recoil spring is properly positioned.

5. Final Touches and Testing

• Fill the Fuel Tank: Use fresh, high-quality fuel mixed with the appropriate amount of two-stroke oil.
• Prime the Carburetor: Pump the primer bulb until fuel flows into the carburetor.
• Start the Saw: Pull the starter cord until the saw starts.
• Adjust the Carburetor: Adjust the carburetor to ensure the engine is running smoothly.
• Test the Saw: Cut a piece of concrete or wood to ensure the saw is functioning properly.

Data Points and Statistics: Rebuild Success

Based on my experience and discussions with other mechanics, a properly executed Stihl TS 420 rebuild has a success rate of around 85-90%. The key factors contributing to success include:

• Using Genuine Stihl Parts: Aftermarket parts can be tempting due to their lower price, but they often lack the quality and precision of genuine Stihl parts.
• Following the Manufacturer’s Specifications: Torque settings, clearances, and other specifications are crucial for proper engine operation.
• Thorough Cleaning: Removing all dirt and debris from the engine components is essential to prevent contamination and wear.
• Patience and Attention to Detail: Rushing the rebuild process can lead to mistakes and ultimately, a failed rebuild.

Woodcutting with a Concrete Saw: A Word of Caution

As I mentioned earlier, using a concrete saw for woodcutting is not its intended purpose and comes with significant risks. However, in emergency situations or for specific, controlled tasks, it can be done with extreme caution.

Why It’s Risky

• Blade Design: Concrete saw blades are designed for abrasive cutting, not for shearing wood fibers. This can lead to kickback and blade binding.
• Lack of Safety Features: Concrete saws lack the chain brake and anti-kickback features found on chainsaws.
• Dust and Debris: Cutting wood with a concrete saw generates a large amount of dust, which can be harmful to your health.

When It Might Be Necessary

• Emergency Situations: As in my ice storm story, a concrete saw might be the only tool available to clear fallen trees or limbs.
• Cutting Root Balls: When removing trees, a concrete saw can be used to cut through root balls that are too large for a chainsaw.
• Specialized Woodworking: Some woodworkers use concrete saws with specialized diamond blades for creating unique textures or shapes in wood.

Safety Precautions

If you must use a concrete saw for woodcutting, follow these safety precautions:

• Wear Appropriate PPE: This includes eye protection, a dust mask or respirator, hearing protection, gloves, and sturdy boots.
• Use a Diamond Blade Designed for Wood: These blades have a different tooth design that is more suitable for cutting wood.
• Cut Slowly and Carefully: Avoid forcing the blade. Let the saw do the work.
• Be Aware of Kickback: Kickback can occur when the blade binds in the wood. Be prepared to control the saw.
• Never Cut Overhead: Cutting overhead is extremely dangerous and should never be attempted.
• Have a Spotter: Have someone watch you while you’re cutting to provide assistance if needed.

Alternative: Chainsaw vs. Let’s compare them:

Chainsaw:

• Pros: Fast, efficient, and can cut through large logs quickly.
• Cons: Requires fuel and maintenance, can be dangerous if not used properly, and can be expensive.

Axe:

• Pros: Simple, reliable, and requires no fuel or maintenance.
• Cons: Slower and more physically demanding than a chainsaw, and requires skill and technique.

For most woodcutting tasks, a chainsaw is the preferred tool. However, an axe is a valuable backup tool and is essential for splitting firewood.

Wood Species and Firewood Quality

The type of wood you burn affects the heat output, burn time, and amount of smoke produced. Here’s a breakdown of some common wood species and their properties:

• Hardwoods:
  • Oak: Excellent heat output, long burn time, and produces minimal smoke. Oak is considered one of the best firewood species.
    • Data Point: Seasoned oak typically has a BTU (British Thermal Unit) rating of around 28 million per cord.
  • Maple: Good heat output, moderate burn time, and produces moderate smoke.
  • Ash: Good heat output, moderate burn time, and produces minimal smoke.
  • Beech: Excellent heat output, long burn time, and produces minimal smoke.
• Softwoods:
  • Pine: Moderate heat output, short burn time, and produces a lot of smoke. Pine is best used for kindling or starting fires.
    • Data Point: Pine typically has a BTU rating of around 20 million per cord.
  • Fir: Moderate heat output, short burn time, and produces a lot of smoke.
  • Spruce: Low heat output, short burn time, and produces a lot of smoke.

Green Wood vs. Seasoned Wood

• Green Wood: Wood that has been freshly cut and contains a high moisture content. Green wood is difficult to burn, produces a lot of smoke, and has a low heat output.
• Seasoned Wood: Wood that has been allowed to dry for several months or years. Seasoned wood is easy to burn, produces minimal smoke, and has a high heat output.

The ideal moisture content for firewood is around 20%. You can use a moisture meter to check the moisture content of your firewood.

Seasoning Firewood: The Key to a Warm Winter

Seasoning firewood is the process of drying wood to reduce its moisture content. This is essential for efficient and clean burning.

• Split the Wood: Splitting the wood increases the surface area exposed to the air, which speeds up the drying process.
• Stack the Wood: Stack the wood in a single row, with gaps between the logs to allow for air circulation.
• Elevate the Wood: Elevate the wood off the ground to prevent moisture from wicking up into the wood.
• Cover the Wood: Cover the top of the wood stack to protect it from rain and snow.
• Allow Time to Dry: Allow the wood to dry for at least six months, and preferably a year or more.

Case Study: Optimal Firewood Drying

I once conducted a small experiment to compare different firewood stacking methods. I split a cord of oak and divided it into three stacks:

1. Traditional Stack: A standard stack on the ground, uncovered.
2. Elevated Stack: A stack elevated on pallets, uncovered.
3. Covered and Elevated Stack: A stack elevated on pallets and covered with a tarp.

After one year, I measured the moisture content of the wood in each stack. The traditional stack had an average moisture content of 28%, the elevated stack had an average moisture content of 22%, and the covered and elevated stack had an average moisture content of 18%. This demonstrates the effectiveness of elevating and covering firewood stacks for optimal drying.

Costs, Budgeting, and Resource Management

Rebuilding a Stihl TS 420 and preparing firewood both involve costs. Here’s a breakdown of some common expenses:

• Stihl TS 420 Rebuild:
  • Parts: $50 – $200 (depending on the parts needed)
  • Tools: $0 – $100 (if you don’t already have the necessary tools)
  • Labor: $0 – $200 (if you hire a mechanic)
• Firewood Preparation:
  • Chainsaw: $200 – $1000
  • Axe: $50 – $200
  • Splitting Maul: $50 – $150
  • Moisture Meter: $20 – $50
  • Fuel and Oil: Varies depending on usage
  • Firewood: Varies depending on source (free if you cut your own, or $100 – $300 per cord if you purchase it)

Budgeting Tips

• Prioritize Essential Parts: When rebuilding your Stihl TS 420, focus on replacing the parts that are most likely to cause problems, such as the piston, rings, and crankshaft bearings.
• Shop Around for Parts: Compare prices from different suppliers to find the best deals.
• Consider Used Tools: You can often find used chainsaws, axes, and other tools in good condition at a fraction of the price of new tools.
• Cut Your Own Firewood: If you have access to a source of free firewood, cutting your own wood can save you a significant amount of money.
• Season Firewood in Advance: Seasoning firewood takes time, so start preparing your firewood well in advance of the heating season.

Resource Management Tips

• Use Sustainable Forestry Practices: When cutting your own firewood, be sure to use sustainable forestry practices. This means only cutting trees that are dead, dying, or diseased.
• Recycle Used Oil: Dispose of used oil properly by taking it to a recycling center.
• Conserve Fuel: Use your chainsaw and other power tools efficiently to conserve fuel.
• Maintain Your Tools: Regular maintenance will extend the life of your tools and prevent costly repairs.

Troubleshooting and Common Pitfalls

Rebuilding a Stihl TS 420 and preparing firewood can be challenging. Here are some common pitfalls to avoid:

• Gather Your Tools and Parts: Start gathering the tools and parts you’ll need for your Stihl TS 420 rebuild.
• Find a Source of Firewood: If you don’t already have a source of firewood, start looking for one.
• Start Seasoning Firewood: If you have a source of firewood, start seasoning it now so it will be ready for the heating season.
• Practice Safe Woodcutting Techniques: Practice safe woodcutting techniques to prevent accidents.
• Join a Woodworking or Logging Community: Connect with other woodworkers and loggers to share tips and advice.

Suppliers of Logging Tools and Drying Equipment

• Stihl Dealers: Stihl dealers sell a wide range of logging tools and equipment, including chainsaws, axes, and safety gear.
• Northern Tool + Equipment: Northern Tool + Equipment sells a variety of logging tools and equipment, as well as drying equipment such as dehumidifiers and fans.
• Forestry Suppliers, Inc.: Forestry Suppliers, Inc. specializes in supplying tools and equipment for forestry, logging, and tree care.
• Local Hardware Stores: Local hardware stores often carry a selection of logging tools and equipment.
• Equipment Rental Services: Some equipment rental services offer drying equipment for rent.

Final Thoughts: A Legacy of Skill and Warmth

Rebuilding a Stihl TS 420 and preparing firewood are skills that connect us to a rich history of craftsmanship and self-reliance. While using a concrete saw for woodcutting is far from ideal, understanding its capabilities and limitations can be valuable in certain situations. By following the steps outlined in this guide, you can breathe new life into your Stihl TS 420, prepare high-quality firewood, and enjoy the warmth and comfort of a crackling fire for years to come. Keep the fire burning!

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