Priya Kapoor
The trim-tilt unit on an outboard motorboat is a crucial component that allows for fine adjustments to the motor and the ability to tilt the engine out of the water when docking or trailering. Over time, these units can become corroded or damaged, requiring replacement or repair. While painting a power trim tilt unit can enhance its appearance and provide a protective coating, it is important to prioritize proper functioning to avoid costly repairs or safety hazards. This decision involves considering factors such as the extent of corrosion, the type of paint, and the potential impact on the unit's performance.
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What You'll Learn
How to prep a corroded power trim unit for painting
Painting a corroded power trim unit on an outboard motor can help protect it from further damage and improve its appearance. Here is a step-by-step guide on how to prepare a corroded power trim unit for painting:
Step 1: Remove the Power Trim Unit
Before starting the preparation process, it is important to remove the power trim unit from the outboard motor. This will allow you to work on it more easily and access all the areas that need to be prepared. Refer to the user manual or seek guidance from a professional if you are unsure about how to safely remove the unit.
Step 2: Strip Old Paint
Once the unit is removed, start by stripping any old paint or corrosion from the surface. This can be done using a chemical paint stripper or a heat gun. If using a chemical stripper, apply it generously to the surface and allow it to sit for the recommended amount of time before scraping off the paint. If using a heat gun, be cautious to avoid burning the surface. Hold the gun at an angle and a safe distance from the surface, and scrape the paint as it softens.
Step 3: Sand the Surface
After removing the majority of the paint, use sandpaper to smooth out the surface and remove any remaining paint or corrosion. Choose the appropriate grit sandpaper for the job, such as 150-grit or 220-320 grit. Focus on scuffing the surface evenly rather than trying to remove every imperfection. This step will help create a smooth base for the new paint to adhere to.
Step 4: Clean and Degrease
After sanding, it is important to clean the surface to remove any dust, debris, or grease. Use a vinegar and water solution or a low-phosphate household cleaner to wash the surface. Rinse thoroughly and allow it to dry completely. You can then wipe down the surface with alcohol to ensure it is free of any grease or contaminants that may interfere with the paint adhesion.
Step 5: Prime the Surface
Before painting, apply a primer to the prepared surface. A zinc chromate primer is recommended to provide a protective base layer and enhance corrosion resistance. Follow the manufacturer's instructions for the primer application, ensuring a uniform coat.
Step 6: Apply Corrosion-Resistant Paint
Finally, you can begin painting the power trim unit. Select a high-quality corrosion-resistant enamel paint designed for use on metal surfaces. Apply several coats of paint, following the paint manufacturer's instructions, to ensure a durable and protective finish. Allow the paint to dry completely between coats.
By following these steps, you can effectively prepare a corroded power trim unit for painting, helping to enhance the appearance and protect it from further corrosion.
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The difference between power tilt and power trim
Painting your outboard motor can be a great way to improve its appearance and protect it from corrosion. However, it is important to consider the specific components of your outboard motor, such as the power trim tilt unit, before deciding whether to paint it or not.
Now, when it comes to the difference between power tilt and power trim, they are two distinct functions that serve different purposes in an outboard motor.
The "power tilt" function is typically used for low-speed operation and when the boat is on a trailer. It helps to save your back by reducing the strain of manually tilting heavy engines. The tilt piston is vertical to the engine, and its purpose is to get the engine out of the water when docking or positioning it for trailering.
On the other hand, "power trim" allows you to adjust the motor's angle, even at full throttle, to achieve the best ride, speed, and RPM. It involves fine adjustments to the motor's position, ensuring the propeller shaft enters the water at the optimal angle in relation to the transom.
The key distinction in their operation is that the "Tilt" unit, when tilted outwards, would snap back to its full inward position when power is applied to the engine in forward gear. However, the "Tilt/Trim" unit maintains its outward position regardless of the power applied to the engine, providing more control over the boat's performance.
It is worth noting that the terms "tilt" and "trim" originated when these functions were often controlled by separate cylinders or pumps. "Trim" referred to a low-volume/high-pressure pump used to adjust the boat's running attitude, while "tilt" was a high-volume/low-pressure pump for trailering.
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Replacing a trim-tilt unit
The trim-tilt unit allows you to optimise the performance of your boat by adjusting the angle of the engine, which, in turn, adjusts the boat's running surface. The "trim" part of a trim-tilt unit refers to the two pistons that make fine adjustments to your motor. The "tilt" part lifts the engine out of the water when you dock or gets it into position for trailering.
If your trim-tilt unit fails to operate, the first step is to determine whether the problem lies with the electric tilt/trim motor or the hydraulic pump assembly. If you try to raise or lower the engine and nothing happens, first check to make sure that the battery is charged and that the battery switch is in the “on” position. Next, listen for the solenoid/start relay while operating the control (tilt) switch up or down. If you hear nothing, the problem will typically be with the tilt switch, solenoid, or with the wires or connections between the two. If you hear a slight clicking noise while pressing the tilt switch, then you have power from the control switch to the solenoid or relay.
If you are replacing the entire trim-tilt unit, you will first need to shut off the power or disconnect the battery from the system. Trace the two wires from the tilt to where they hook up (in some cases, they’re behind a plastic cove) and remove them from the connection. Before you do anything else, take a picture of how the wires are routed into the motor housing. The “tilt” piston is the single one going vertical to the engine. On some tilt pistons, there is a C-clip on one side (starboard). Use a ring plier to gently remove it and put it to the side. The pin (about five inches long and an inch in diameter) has plastic bushings on either side and the pin should easily slide out – starboard-to-port – using your fingers. At the bottom of the trim, there’s a pivot that holds the unit in the frame of the motor mount. There are bolts and washers on both sides. Take the bolts out and put them to the side.
The hard part is getting the unit’s holes aligned horizontally so the big stainless pin can slide through the trim unit and mate with the starboard side hole. It might be a good idea to have someone help with this. Once the pin is set, run the wires (using pictures of how they came into the engine compartment), twist the battery switch to “on”, and you’re done! Setting the tilt piston pin is easy – just put the C-clip on and you have a new trim unit.
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Parts required for power trim and tilt
Power trim and tilt kits are available for purchase, which contain all the necessary parts for conversion. These kits are designed for specific outboard makes and models, so it is important to select the correct one.
The power trim and tilt kits include the following parts:
- Trim gauge
- Trim sender unit
- Trim switch at remote control
- Trim switch at outboard/transom
- Power trim relay box
- Wiring and connections
Additionally, some specific parts that may be required for power trim and tilt systems include:
- Pistons for fine adjustment of the motor
- Hydraulic cylinders
- Stainless steel pins
- C-clips
- Bolts and washers
- O-rings
- Seals
- Grease lubricant
- Gear lube oil
It is important to note that the power trim and tilt systems may vary depending on the outboard motor brand and model. Therefore, it is recommended to refer to specific instructions and parts lists provided by the manufacturer or authorized dealers.
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Steps to align the unit's holes horizontally
Painting your power trim tilt unit on an outboard can be a great way to refresh its look and provide protection from the elements. However, before you start painting, it's important to ensure that all the parts are properly aligned, including the unit's holes. Here are the steps to align the unit's holes horizontally:
Step 1: Prepare the Work Area
Clear the area and gather the necessary tools and materials, such as a drill, tape or paper, markers, and any other relevant equipment.
Step 2: Mark the Hole Locations
Using the existing holes as a reference, mark the locations where the new holes will be drilled. You can use tape or paper to cover the area and then mark the centre of each hole. This will help ensure accuracy when drilling.
Step 3: Use a Level for Alignment
To align the holes horizontally, use a level. If your level is shorter than the distance between the holes, you can extend it by placing it on a straight piece of wood. Hold the wood with the level on top against the wall horizontally and adjust until the level shows a "level" position. Then, draw a line along the top as a reference.
Step 4: Pre-mark Positions
On the wood piece, pre-mark two positions that are the desired distance apart (e.g., 1.5 meters). This will guide you in drawing short marks instead of a long line across the wall.
Step 5: Alternative Method with Water Tubing
Alternatively, you can use water tubing as a "level." Fill up a portion of the tube with water, leaving some unfilled space at each end. Hold the tubing so that the water tops are at approximately the same height. Move the tubing to mark the position of one of the holes. Then, measure the desired distance horizontally and make a vertical tick mark. Position one end of the tubing to match the first mark, and the other end near the second vertical tick.
Step 6: Drill the Holes
Once you have marked the positions, use your drill to carefully create the holes. Ensure that you are drilling straight and that the holes are aligned horizontally.
Step 7: Check Alignment
After drilling, double-check the alignment of the holes to ensure they are level with each other. Make any necessary adjustments if there are slight misalignments.
Step 8: Finalize Assembly
With the holes properly aligned, you can proceed with the rest of the assembly or installation process, following the relevant instructions for your power trim tilt unit.
Remember to take your time and work carefully to ensure the best results. If you have any doubts or concerns, it is always a good idea to consult a professional or seek advice from experienced individuals in the field.
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Frequently asked questions
Power tilt and trim allow you to adjust the motor of your outboard at full throttle. Power tilt is for low-speed operation and helps to save your back while on the trailer.
You will need a power trim and tilt unit that matches your outboard's make and model. You will also need a trim gauge, trim sender unit, trim switch at remote control, trim switch at outboard/transom, and relays.
Sand and prep the unit to bare metal, then apply a zinc chromate primer. After that, apply several coats of high-quality corrosion-resistant enamel.
First, gently remove the C-clip with a ring plier. Then, slide out the pin using your fingers. Take out the bolts on both sides of the pivot holding the unit in the frame of the motor mount.
If your unit is not functioning as it should, it may be time to replace it. For example, if the trim rods do not come up at the same time, you may need to replace the unit.
