Raising Transom On An Aluminum Boat: Diy Guide

Raising the transom on an aluminium boat is a complex process that requires careful planning and execution. It is important to note that the transom's height impacts the engine propeller's productivity and the boat's overall stability. While some boaters opt to rebuild the transom to its original height, others choose to raise it to compensate for a long shaft or reinforce it for added safety. This process can be done by creating a lift or bracket that fits over the transom without the need for welding. Alternatively, one might remove the old transom, measure and cut a new one, and reinforce it with plywood, epoxy resin, and an aluminium sheet.

Create a lift bracket to raise the transom without welding

To raise the transom on an aluminium boat without welding, you can create a "lift" or bracket that fits over the transom to increase the motor's height. Here's a step-by-step guide on how to create a lift bracket:

Materials:

• 2-by-2 inch square aluminium tubing, 1 foot long
• 3/4-inch aluminium plate, 1-by-2 feet
• 2-by-12-by-24-inch block of wood
• MIG welding machine
• China marker
• 1-inch drill bit
• 1-inch outboard mounting bolts
• Flat washers
• Lock washers
• Nuts

Step 1: Welding the Aluminium Plate and Tubing

Weld the shorter edge of a 1-by-2-foot-by-3/4-inch aluminium plate to the side of the 2-by-2 inch square aluminium tubing, ensuring the aluminium plate is parallel to and even with the long edge of the tubing. Use a MIG welding machine for this step and allow the weld to cool thoroughly.

Step 2: Creating the "U" Shaped Channel

Turn the welded aluminium plate and tube over so that the plate is flat on the welding table. Weld the short edge of a second piece of aluminium plate to the side of the tubing to create a "U" shaped channel, 2 feet deep. Ensure that the aluminium plate is parallel to and even with the long edge of the tubing. Allow the welds to cool completely.

Step 3: Marking the Mounting Bracket Holes

Slide the aluminium plate/square tube bracket into the mounting bracket of your outboard, with the 2-inch square tube at the top. Use a china marker to mark the location of the mounting bracket holes onto the aluminium plate.

Step 4: Drilling the Holes

Place a 2-inch thick block of wood between the two aluminium plates. Using a 1-inch drill bit, drill four holes through both plates and the wood block at the marked locations for the motor mounting holes.

Step 5: Installing the Bracket and Motor

Place the channel of the aluminium bracket over the transom at the motor mount location. Position the motor on the aluminium bracket and install flat washers on the 1-inch outboard mounting bolts. Push the bolts through the mounting holes on the outboard mounting bracket, the aluminium bracket, and the transom.

Step 6: Securing the Bracket

Install lock washers on the mounting bolts and then thread nuts onto the bolts, tightening them to 55 foot-pounds. This will securely hold the bracket and motor in place, completing the process of raising the transom without welding.

Use a pre-welded replacement transom for a quick fix

If you're looking for a quick fix to raise the transom on your aluminum boat, you can opt for a pre-welded replacement transom. This option eliminates the need for welding additions to increase the transom's height. Here's a step-by-step guide on how to use a pre-welded replacement transom:

Step 1: Choose the Right Size

Pre-welded replacement transoms come in various sizes to fit different boat transom dimensions. Measure your boat's transom height and width to select the appropriate size. Typical sizes include 12" x 60" for 15" transoms and 15" x 72" for 21" transoms. If you have a Deep V boat, you may need a transom that is 16" tall at the corners and 12" tall at the motor mount.

Step 2: Cut to Fit

Once you've selected the right size, cut the pre-welded replacement transom to match your existing transom's dimensions. Ensure that you cut it accurately for a perfect fit.

Step 3: Bolt It In

After cutting the replacement transom to size, it's time to install it. Align the new transom with your existing transom and bolt it in place. This process is straightforward and can be completed in 30 minutes or less, as mentioned by a user on Microskiff.com.

Benefits of Pre-Welded Replacement Transom

Using a pre-welded replacement transom offers several advantages. Firstly, it is a quick and easy solution compared to building a new transom from scratch, reducing your fabrication time significantly. Secondly, it provides a solid support system and eliminates the risk of rot, ensuring the longevity of your boat's transom.

Safety Precautions

While raising the transom on your aluminum boat, it is crucial to prioritize safety. Before performing any maintenance or repair work, always disconnect the negative cable of your battery to prevent electrical shock or accidental starting. Additionally, follow appropriate safety precautions when using power tools.

By following these steps and safety measures, you can efficiently raise the transom on your aluminum boat using a pre-welded replacement transom.

Prepare the right materials for reinforcement

Raising the transom on an aluminium boat is a delicate task that requires careful planning and execution. Before you begin, it is crucial to gather all the necessary materials to ensure a safe and effective reinforcement process. Here is a detailed list of the materials you will need to reinforce your aluminium boat's transom:

Marine-Grade Plywood:

The marine-grade plywood will serve as the new transom, providing a sturdy and durable base. It is essential to select high-quality plywood designed to withstand the harsh marine environment. This type of plywood is more resistant to rot and decay, ensuring the longevity of your boat's transom.

Sturdy Piece of Aluminium Sheet:

A sturdy piece of aluminium sheet will be attached to the plywood to provide additional strength and protection. This aluminium sheet should be measured and cut to match the size of the plywood, creating a secure and unified structure.

Carpenters Glue and Epoxy Resin:

Carpenters glue is essential for attaching the plywood to the boat. Ensure you have a generous amount to spread evenly across the plywood, creating a strong and secure bond. The epoxy resin will be applied over the plywood, providing additional strength and waterproofing. It is important to follow the manufacturer's instructions when mixing and applying the epoxy resin.

Marine-Grade Screws and Bolts:

Marine-grade screws and bolts are crucial for fastening the plywood and aluminium sheet securely in place. These fasteners should be distributed evenly to ensure even pressure and a tight fit. Remember not to over-tighten the screws or bolts to avoid cracking the plywood.

Measuring Tape, Pencil, and Level:

Accurate measurements are vital for a successful transom reinforcement. The measuring tape will help you measure and mark the dimensions of the new transom on the plywood. A pencil will be used for marking, and a level will ensure that the plywood is attached evenly and securely.

Sealants:

Sealants, such as marine-grade epoxy, are essential for sealing all edges and creating a watertight barrier. This step is crucial to prevent water infiltration, which can deteriorate the transom over time.

Safety Equipment:

Don't forget to include safety equipment in your list of materials. Wear protective gear, such as welding masks, when working with power tools or chemicals. Ensure you have adequate ventilation during the reinforcement process.

With these materials gathered and carefully selected, you will be well-prepared to reinforce your aluminium boat's transom effectively and safely. Remember to follow a detailed step-by-step guide for the reinforcement process, ensuring a sturdy and long-lasting transom for your boat.

Remove the old transom and inspect the area

To remove the old transom, start by detaching any accessories or parts attached to it, such as the motor, ladder, or any other hardware. Make sure to store these parts in a safe place to avoid any damage. Then, carefully remove the screws or bolts holding the old transom in place. Be sure to handle with care to avoid causing damage to the boat's hull. After removing the old transom, inspect the area for any signs of wear or damage that must be addressed before installing the new, reinforced transom.

Look for any rotten or broken sections in the transom and hull area. Remove and polish these sections or discard the entire component if it is significantly weakened. Drill guiding holes in the specified transom positions for bolt and rivet placement or sealing. These holes will also help you determine if your boat's size specifications are sufficient for the engine and stern installations.

Once the old transom has been removed and the area has been inspected, you can start preparing the new transom. Measure the size of the new transom, using the old transom as a guideline, and mark the dimensions on the marine-grade plywood. Ensure you account for any additional reinforcements you plan to add. Cut the plywood to size, being precise to avoid stability issues in your boat. Check the fit by placing the plywood in the transom area and make any necessary adjustments.

Before attaching the new transom, clean the transom plate and the rear of the reinforcement material with appropriate sandpaper to ensure maximum adhesion for the sealant or adhesive tape. You can use marine-grade epoxy sealants or 3M M5200 sticky tape for this purpose. Spread the sealant or adhesive evenly over the area, including the rear of the strengthening material.

Now you are ready to assemble the new transom. Place the transom strengthening component in its allocated location, following the guiding holes marked earlier. Compress the reinforcement part and begin bolting it with rivets or stainless lock nuts. Fasten all the bolts and leave the reinforcement to solidify completely, typically for about a week. Examine it frequently to detect any hair-like gaps, especially when using materials such as polycarbonate, fiberglass, PVC, or plyboard.

Measure, cut and attach the new transom

Raising the transom on an aluminium boat is a complex process that requires careful planning and execution. Here is a detailed, step-by-step guide on how to measure, cut, and attach a new transom to your aluminium boat:

Step 1: Measurements and Planning

Before starting the installation process, it is crucial to take accurate measurements. Use the old transom as a reference to mark the dimensions on the new transom material, which is typically marine-grade plywood. Ensure that you account for any additional reinforcements you plan to incorporate. Precision is critical at this stage, as an ill-fitting transom can cause stability issues.

Step 2: Cutting the New Transom

Once you have the measurements, carefully cut the plywood using an appropriate tool. After cutting, test the fit by placing the plywood in the transom area. Make any necessary adjustments to ensure a snug fit before proceeding to the next step.

Step 3: Applying Adhesives and Attaching the Plywood

Spread a generous amount of carpenter's glue or adhesive evenly across the side of the plywood that will face the boat. Position the plywood in the transom area, pressing it firmly against the boat, and check that it is level. Use marine-grade screws or bolts to attach the plywood to the boat, being careful not to over-tighten to avoid cracking the wood. Allow the glue to dry completely before proceeding.

Step 4: Applying Epoxy Resin for Waterproofing

Mix the epoxy resin according to the manufacturer's instructions, and then apply a thick layer to the entire surface of the plywood using a brush. Ensure that all areas, especially the edges, are covered to create a watertight seal. Allow the epoxy to cure fully. This step is crucial for providing additional strength and waterproofing to the transom.

Step 5: Finalising the Installation

After the epoxy has cured, measure and cut an aluminium sheet to match the size of the plywood. Place the aluminium sheet onto the plywood, ensuring proper alignment. Securely fasten the aluminium sheet to the plywood using marine-grade screws or bolts, distributing them evenly for even pressure.

Step 6: Sealing and Reinforcement

Seal the edges of the transom with a high-quality marine sealant to further protect your boat's transom against water penetration. Apply the sealant generously along the edges where the aluminium sheet meets the boat and allow it to dry completely. This step ensures additional protection and longevity for your reinforced transom.

Additional Tips:

• Choose high-quality marine-grade plywood to ensure it can withstand harsh marine conditions and resist rot and decay.
• Proper sealing is essential. Seal all edges with a waterproof sealant to prevent water infiltration, which can deteriorate the transom over time.
• Regular inspections are vital to ensure the reinforcement is holding up well. Check for signs of water infiltration, rust, or other damage, and address any issues promptly.
• Consider seeking professional assistance if you are inexperienced with boat repairs.
• Regular maintenance will prolong the life of your reinforced transom. This includes cleaning, re-sealing when necessary, and storing your boat in a dry, covered space when not in use.

By carefully following these steps and tips, you can successfully raise the transom on your aluminium boat, ensuring its longevity, stability, and safety for future boating adventures.

Frequently asked questions