Transom Transformation: Jon Boat's New Heart

If you're looking to replace the transom on your Jon boat, you'll need to decide on the type of wood or material to use. Plywood is a popular choice, but it's important to avoid pressure-treated wood as the chemicals can react with the aluminium. Instead, opt for exterior-rated plywood like BCX and seal it with epoxy resin or spar varnish. If you're looking for an alternative to wood, consider Coosa board, a waterproof material that can be strengthened with fibreglass. When it comes to removing the old transom, you may need to cut away some aluminium to access it. Take care to support the transom as you remove it to avoid it crumbling and creating more work for yourself when creating a template for the new one.

Choosing the right wood

When it comes to choosing the right wood for your jon boat's transom, there are a few options to consider. Firstly, it is important to never use pressure-treated wood as the chemicals used in the treatment do not interact well with aluminium. Instead, opt for exterior-rated plywood such as BCX or marine-grade plywood like White Oak, Mahogany, or Marine Ply. These types of wood are strong and durable, providing rigidity to the transom.

If you're looking for an alternative to plywood, consider Coosa Board, a product that does not absorb water and is highly resistant to rot. Another option is to use aluminium checker plate, which, while more expensive, will never need to be replaced.

When sealing the wood, avoid using fibreglass resin without fibreglass cloth as it will not adhere well and may peel off. Instead, opt for a waterproof epoxy resin or spar varnish to create a strong and long-lasting seal. Additionally, consider using a wood sealer or a homemade mixture of linseed oil and other products to further protect the wood from moisture.

Remember, keeping the wood dry is crucial to preventing rot. Ensure that your boat is properly drained and consider using a fan to speed up the drying process after each use. By choosing the right type of wood and taking proper care of it, you can ensure the longevity of your jon boat's transom.

Removing the old transom

Step 1: Assess the Situation

Before starting, carefully inspect the transom area. Take note of any cracks, corrosion, or damage to the aluminium structure. This will help you determine the best approach for removal and ensure you have the necessary tools and materials.

Step 2: Remove the Outboard Motor

The first step in removing the old transom is to detach the outboard motor. Make sure you have a clear workspace by unbolting and carefully lifting the motor away from the transom. It is advisable to have an extra pair of hands to help with this step to avoid any damage to the motor or the boat.

Step 3: Accessing the Transom

The transom is typically covered by an aluminium panel or "top cap." To access the transom, you will need to remove this panel. Carefully inspect how the panel is attached. It may be welded, riveted, or bolted in place. Use the appropriate tools to remove the panel without causing further damage to the boat.

Step 4: Removing Rivets or Bolts

If the transom is held in place with rivets or bolts, you will need to drill them out carefully. Make sure to use the correct size drill bit to avoid damaging the surrounding aluminium structure. Work slowly and methodically to avoid injury and unintended damage.

Step 5: Chipping Away

In some cases, the transom wood may be chipped or broken down into smaller pieces before removal. This can be done with a chisel and hammer, carefully prying and breaking the wood into manageable sections for removal. Always wear appropriate safety gear, including eye protection, when performing this step.

Step 6: Lifting Out the Old Transom

Once all the fasteners have been removed and the transom is accessible, it's time to lift out the old transom. Depending on its condition, it may come out in one piece or need to be removed in sections. If it's fragile, you can screw or glue a smaller piece of plywood to the transom to provide additional support and prevent it from crumbling during removal.

Step 7: Clean the Area

After removing the old transom, it's essential to clean the area thoroughly. Use a wire brush to remove any remaining debris, rust, or old sealant. This step ensures a smooth surface for the new transom and helps you identify any additional repairs that may be needed.

Step 8: Inspect and Prepare

Before installing the new transom, take the time to inspect the surrounding aluminium structure. Look for any signs of damage or corrosion that may have been hidden by the old transom. Address any issues and treat the area with a suitable corrosion inhibitor to prevent further deterioration.

Remember to take your time during the removal process, and don't be afraid to seek guidance from more experienced boat enthusiasts or professionals if you're unsure about any steps.

Sealing the wood

Step 1: Choose the Right Wood and Sealant

It is crucial to select the appropriate wood and sealant for your Jon boat. Avoid using pressure-treated wood, as it is not suitable for this application. Instead, opt for exterior-rated plywood, such as BCX, or marine-grade plywood. For the sealant, choose a product specifically designed for marine use, such as a quality end grain sealer kit.

Step 2: Prepare the Wood Surface

Before applying any sealant, ensure the wood surface is properly prepared. Use sandpaper to remove any previous finish or imperfections. Start with a rough grit to address tricky areas, and then switch to a finer grit to give the wood a uniform finish. This step is crucial for the sealant to adhere properly.

Step 3: Apply the Sealant

Follow the instructions provided with your chosen end grain sealer kit. Typically, you will use a paintbrush to apply a uniform coat to the wood. Make sure to follow the prescribed order of application and allow adequate drying time between coats.

Step 4: Allow for Curing

Curing is a critical step in the sealing process. Even with a quick-cure sealer, allow ample time for the sealant to cure completely. This will ensure that the wood is properly dry and sealed before it comes into contact with water again.

Step 5: Regular Maintenance

Remember to inspect your boat's transom wood annually. Check for any signs of waterlogging, rot, or sealant deterioration. Re-apply sealant as necessary to prevent water absorption and maintain the integrity of the wood.

Some additional tips to consider:

• You can use exterior plywood and seal it with epoxy resin or spar varnish.
• If you're on a budget, you can use exterior paint or latex porch paint to seal the wood. However, this may not provide the same level of protection as marine-specific sealants.
• Consider using a combination of fibreglass cloth and epoxy resin for a stronger and more durable seal.

By following these steps and performing regular maintenance, you can ensure that your Jon boat's transom wood remains sealed and protected, prolonging the life of your boat.

Installing the new transom

Before installing the new transom, it is important to understand the reasons behind transom replacement. The transom is the flat surface at the back of the boat that the motor is mounted on. It is usually made of wood, which can rot over time due to water exposure. Therefore, it is essential to replace the transom to ensure the safety and longevity of your Jon boat.

• Remove the old transom: Carefully cut off the top cap of the transom after removing the motor. You may need to lift or cut the corner caps to access the transom wood. Remove any rivets or bolts holding the transom in place. Take out the old wood in sections, using a chisel or similar tool if necessary.
• Prepare the new transom wood: The new transom should be made of exterior-rated plywood, such as BCX or marine-grade plywood. Some boaters also use white oak or mahogany. Avoid using pressure-treated wood, as the chemicals can react negatively with the aluminum. Cut the new transom wood to the appropriate size and shape, ensuring it fits snugly in the transom cavity.
• Seal and protect the wood: Treat the plywood with a penetrating epoxy sealer to make it waterproof. You can also use fiberglass resin with fiberglass cloth for added strength and protection. Alternatively, some boaters use spar varnish or oil-based porch paint as a finish.
• Install the new transom: Place the new transom wood into the cavity, ensuring it is secure and does not move. Reattach the top cap and corner caps using rivets or bolts. Use stainless steel or aluminum rivets and seal with marine-grade sealant to prevent galvanic corrosion.
• Reattach the motor: Once the new transom is securely in place, you can reattach your outboard motor. Ensure the motor is clamped tightly to the transom and consider adding a safety chain or cable for extra security.

By following these steps, you can ensure your new transom is installed correctly and will provide a strong and durable surface for your outboard motor. Remember to regularly inspect and maintain your transom to prevent any future issues.

Finishing touches

Once you've replaced the transom on your Jon boat, there are a few finishing touches to consider. Firstly, you'll want to ensure that the transom is properly sealed. This can be done with a coat of epoxy resin or spar varnish. It is important to note that you should avoid using pressure-treated wood, as the chemicals used in the treatment process can react negatively with the aluminum. Instead, opt for exterior-rated plywood like BCX or white oak, mahogany, or marine ply.

Additionally, you may want to consider adding a safety chain or cable to your outboard motor, especially if your transom is made of aluminum. This will provide extra security and prevent the clamps from slipping.

If you're looking to add a personal touch, a nice wood finish on the transom can not only make your boat look classy but also add a sense of security. However, this is not necessary for the functionality of your boat, and some prefer to keep their boats wood-free to eliminate the risk of rotting.

Finally, remember to regularly maintain your boat by keeping the drain clear of leaves and debris. This will help prevent water from sitting in the boat and causing damage to the transom over time.

Frequently asked questions