How to Fix a Cavitation Plate on a Mercury 225 Torque Master Lower Unit | DIY Outboard Repair

How to Fix a Cavitation Plate on a Mercury 225 Torque Master Lower Unit | DIY Outboard Repair

The cavitation plate on the Torque Master lower unit of my Mercury 225 (2015 model) was missing a chunk. I’ll show you how it was repaired using tig welding.
On the TorqueMaster lower unit, which is known for its high-performance, heavy-duty design, the cavitation plate serves several key functions:
*Reduces Propeller Ventilation: By creating a physical barrier above the propeller, the cavitation plate helps prevent air from being sucked into the blades, keeping the propeller fully submerged in water for optimal thrust.
*Improves Hole Shot and Speed: With less ventilation, the engine can push the boat forward more effectively, leading to faster acceleration and improved top-end speed.
*Stabilizes the Boat: The cavitation plate adds to the hydrodynamic stability of your Mercury 225, especially during sharp turns or rough water conditions.
Protects the Lower Unit: It can deflect debris or reduce the impact of surface contact, offering some protection to the TorqueMaster gearcase.

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Pro Wrencher is a mechanic who has experience repairing everything from old farm equipment to autos/trucks/boats to locomotives. He lives in an old house and drives old cars and has old boats- giving him a lifetime of stuff to repair!
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