Bellows are located on stern drives. They will not be found on inboards or outboards. These are found in the lower drive unit of your boat. These components also often come prepared with a pesticide that prevents wildlife from biting through the elements that are made of rubber.

How do you check bellows on a boat?

Use your fingers to pull apart the folds of the boot so you can see down into its valleys. Also, whenever you have the drive off for servicing, be sure to look at the boots from the inside, or have them looked at. Check for rust on the output shaft and U-joints, which is a sure sign water has intruded.

Can you run a boat without exhaust bellows?

Technically you do not even need an exhaust bellows so either one is fine. Iv'e seen a few shift boots burn't through from boats without an exhaust bellows or tube...

How often do bellows need replaced?

Inspect the bellows annually and replace it every two years. Many, myself included, feel that if the drive is removed for inspection, you may as well just replace the bellows while you're at it. It's cheap insurance.

What are bellows on a Mercruiser?

Sterndrive bellows are rubber “boots” that seal out water around the exhaust, U-joints and shift cable, while allowing the drive to pivot and tilt. These can wear out and require regular replacement (see owner's manual for service intervals).

Mercruiser Alpha 1 Gen 1 Stern Drive Repairs Part 5: How to install a Mercruiser bellows on a boat

36 related questions found

Can bad bellows sink a boat?

A crack in the exhaust bellows won't sink your boat, but it will fill your bilge and make a mess in the cabin. You'll find bellows only on stern drives and not inboards or outboards.

How many bellows are on a boat?

The bellows are rubber boots designed to keep water out of the boat as well critical areas of the drive itself. There are three primary bellows for today's outdrives. The U-joint Bellow: This bellow is attached from the bell housing to the transom plate.

How do you know if your boat bellows are bad?

There is a very easy way to figure out if there is something that is wrong with your bellows – if there is water in your cabin, then there is likely a crack somewhere in your boat (or perhaps a loose gasket or clamp). If there is a loud noise while driving, that might also be a sign of trouble.

Should there be any water in the bilge?

This is normal and should not be a cause for concern as long as the water does not keep entering the boat. As long as the bilge pump is not running often, the amount of water in the bilge should be safe.

What do exhaust bellows do?

Most commonly, exhaust bellows are designed to limit the motion/kinetic energy within or passed along from the engine to high-cost emissions systems by absorbing displacements and vibrations and accommodating thermal expansion.

Do exhaust bellows have holes in them?

The slits in the exhast bellow

The slits in the exhast bellows are to reduce presure when the engine is at idle and the boat is not moving; therefore allowing for a steady idle.

Are exhaust bellows important?

They are required to remain a watertight seal for years while withstanding flexing and bending, as well as exposure to water. In the exhaust industry, these metal bellows are extremely important. It is critical to inspect your exhaust bellows every year, as well as replace them every three to five years.

How do I know if my gimbal bearing is bad?

Your gimbal bearing will make the most noise when turning the boat. Will be a low pitched growl. Noise will usually subside some after several shots of grease to the gimbal zerk on the starboard side of the transom housing. A bad gimbal bearing will make noise anytime engine is running.

What is a gimbal on a boat?

A gimbal is a pivoted support or mount that allows the rotation of an object about a single axis. ... on a Boat, the gyroscopes, rate gyros, marine compasses, stoves, and even drink holders, typically use gimbals to keep them upright with respect to the horizon despite the ship's pitching and rolling.

How does water get into the bilge?

Bilge water enters from an array of different sources, including but not limited to Prop and rudder shaft packing, a weak or rusty hose clamp, dry rotted or damaged hoses, old and worn out thru hull fitting, mast drip, window or port hole leaks, air conditioning condensation sweat, engine exhaust leak, hatch leak, or a ...

How often should I run my bilge pump?

It should check for water every two minutes. Nothing should come out of the bilge unless it has been raining or you have been in rough water. Next time you have her on the trailer use a water hose to fill the bilge and watch for where it comes out of the hull.

Why do boats have bilges?

The bilge is the lowest inner part, or bottom point, on a boat, and is designed to collect excess water. On vessels of virtually any size, a pump inside the bilge performs a very important function: to remove accumulated water by creating pressure or suction so that the water can be removed.

What happens when bellows fail?

Keeping Water From Entering The Hull

Engine power reaches the sterndrive through the drive shaft. Engine exhaust flows through the transom through the drive and exits beneath the waterline at the prop. ... If the bellows fail, they can let enough water into the boat to sink it.

How long does it take to replace a gimbal bearing?

which will protect things moving forward and thus we should be good to go in that area for some time. I think in all, he mentioned the parts would come to around $200 total. 3-4 days to complete.

How do you know if your outdrive is bad?

Bad outboard lower units can give the operator shifting issues, and other signs will include water in the gear lube, metallic particles on the drain screw magnet, clunking sounds when shifted, or the loss of the ability to shift into gears.

What are bellows used for?

Bellows are widely used in industrial and mechanical applications such as rod boots, machinery way covers, lift covers and rail covers to protect rods, bearings and seals from dirt. Bellows are widely used on articulated buses and trams, to cover the joint where the vehicle bends.

What is a sterndrive 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. ... An inboard is a marine propulsion system that is enclosed within the hull of the boat — it is usually connected to a propulsion screw by a driveshaft.