What is a boat transmission called?

A marine transmission — or marine gear — is a wondrous thing. It couples all the torque a big diesel or gas engine can deliver to the shaft that spins the propeller, so it must be built like a tank.

Does a boat have a transmission?

Your marine transmission may be dull and mysterious, but your boat wouldn’t get far without it. Of all the myriad mechanisms and devices that combine to push your boat through the water, none is more ignored and misunderstood than the marine transmission.

Do boats have a clutch?

For the record, boats do not have a clutch like a car. Unlike cars, the propellers of boats don’t undergo much slippage when coming in contact with water. … These clutches are cushioned with gearbox oil and activated by oil pressure.

What is marine gear?

The main parts that make up a marine gear are: [1] the input shaft that is driven by the engine, [2] the output shaft that drives the propeller, [3] a wet-type hydraulic multi-disc clutch that engages and disengages power transmission to the output shaft, [4] the gears that reduce the drive from the engine to the …

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How do I know if my boat transmission is bad?

No more than 2,500 rpm in reverse gear. No shifting at more than 1,300 rpm, either. Two other culprits are low fluid levels and moisture intrusion. While you’re checking the transmission fluid level, take a moment to look closely at the fluid and smell it.

Why do boats not use transmissions?

Have boats not got gears because the medium of water has traditionally allowed designers to get away without having them (you can still get going from standstill due to prop slipping, but prop of planing boat is designed to work most efficiently at point where engine is producing max power, so until it’s got to max …

How much does it cost to rebuild a boat transmission?

What is the cost? Between $600 and $1,200 on average, with some gears costing more, depending on the gear. Again, you can ask for an estimate over the phone and if we need to see the gear first, we will not charge you to inspect and quote a price for the rebuild.

Why are boat engines so inefficient?

Why do boats burn so much gas? The main reason why boats will always burn more gas than cars is they run on water. Aerodynamics, wind resistance, waves, and drag affect the fuel consumption of a boat. Basically, a boat needs to use more fuel to cover the same distance a car will cover.

Why do boats not have multiple speed transmissions?

But the real reason is something else. Because the prop has only a limited grip on the water, there is always 10-50% slip, so there is no absolute need for an automotive gearbox. As a result, the transmissions intended for marine application are much simpler.

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Why are clutches used in marine engines?

The clutch allows the engine to run without having to turn the propeller and shafting. Without a clutch all that inertial load would require a monstrous starter, or mass amounts of air to start the engine – a waste financially and mechanically.

What is a soft clutch boat?

Soft Clutch – Basically works the same as a manual car clutch but using a floor mounted hand lever. Can ease in and out of gear and is usually fitted th V8 mid mount engines.

What is a stern drive on a boat?

A sterndrive is a marine propulsion system that is attached to a sterndrive, also known as an outdrive. The drive unit is both the transmission and propulsion. When the captain turns the steering wheel, the entire drive turns. No rudder is needed.