How does a stern drive work?

Asked by: Carl Theroux

A stern-drive engine is attached through the transom to a drive unit (also called an “outdrive”) that is essentially the lower unit of an outboard. The engine turns a drive shaft that is attached to a propeller at the other end.

Are stern drives any good?

Are sterndrives reliable? Yes, provided correct maintenance procedures have been carried out at the required intervals. Sterndrives on trailer boat applications are more reliable than permanently moored sterndrives.

How does a stern drive steer?

Stern Drives are also called Inboard / Outboard (I / O). Unlike the Twin or Single Inboard which has a propeller set at a fixed angle and must rely on a rudder for turning, these engine types steer by pivoting the propeller to the right or left.

Is sterndrive better than outboard?

If you want a transom for water play, the smart move is to get the sterndrive. If you want better corrosion resistance and easier maintenance, plus drives that can be trimmed clear of the water, go for the outboards. It’s your call, and with the Aviara AV32, either choice is a winner.

Can you leave a stern drive boat in the water?

Never leave the sterndrive trimmed up in the water for an extended period of time. In this position, marine growth on the stainless ram can damage the seals to the ram cylinder.

How long will a stern drive last?

between 10-15 years

It’s also common to expect between 10-15 years out of a well-used sterndrive and transom assembly, and then it’s a matter of continual repairs or replacing it once and for all. Sterndrives are a faster and more efficient design, as they are mounted to the rear and produce less drag.

How many hours does a sterndrive last?

It should last at least 2000 hours before it needs a major rebuild if it is properly maintained.

How does sterndrive connect to an engine?

A stern-drive engine is attached through the transom to a drive unit (also called an “outdrive”) that is essentially the lower unit of an outboard. The engine turns a drive shaft that is attached to a propeller at the other end.

How is a stern drive cooled?

You need to use fresh water (or “fresh water” according to classification) for cooling, whereas seawater has to serve to freeze. In inline engines, the engine can pump the water to the system through a stern drive pump from outside the boat.

What is the difference between sterndrive and V drive?

Ultimately, V-drive systems offer more space amidships than a conventional inboard and require less maintenance and service than sterndrive systems. While sterndrives are faster and more fuel-efficient, a V-drive can swing a bigger wheel, and you’re more likely to find a replacement prop when far from home.

Are stern drives good in saltwater?

Not many people talk about that, but it just shows the technology in the sterndrive market.” Technology has also improved corrosion protection – especially in the saltwater environment – for sterndrives. “There’s no doubt earlier closed-cooled sterndrives suffered terribly from corrosion,” admitted Ray.

Are stern drives OK in salt water?

As far as leaving it in saltwater besides double the maintenance, don’t leave the drive trimmed up. Its going to be submerged anyway and if the trim rams exposed not only Is there more metal exposed to corrosion but the barnacles will grow on the ram to the point you can’t lower the out drive.

How do I service my sterndrive?

Apply Mercury 2 4 C to the shaft. And parts then reinstall. By this time the gear case can be refilled pump the lube into the case until it flows from the vent.

How much is a new outdrive?

$2,849.00

New 2022 Mercury Alpha-1 Gen II OutDrive – $2,849.00



NEW Alpha-1 Gen II SternDrive / OutDrive.

How do you check bellows on a boat?

Tips for checking the condition of your bellows



U-Joint bellows should be firm. Poke around on them look for soft spots, cracks or tears. Look for any signs of moisture on the bottom of the u-joint bellow.