What is a shaft log on a boat

Packing which is usually braided fiber treated with wax or a similar substance to make it waterproof and lower its frictional resistance. With the strut bearing in place permanently our shaft is now finished machined to the exact length with the coupling installed.

Triangular Offset Type Fiberglass Hull Self Aligning Cast Bronze Square Base and Offset Type Log Only.

What is a shaft log on a boat. Conventional in Wooden Boat. The difference here is that the intermediate tube runs through an oversize hole drilled in the keel and a piece of wood above the keel known as the shaft log. The inner and outer bearings are usually secured by bronze coach screws.

As the boat works the joint between the bearing and keellog starts to leak. A heavy longitudinaltimber placed over the keel in a ships sternthrough which the propeller shaft passes. A term applied to a bracket supporting the afterend of the propeller shaft and the propeller.

Replacing a propeller shaft shaft log strut or rudder one at a time is a fairly straight forward job as you have a given as to exactly where one of these pieces is supposed to end up and probably what it looked like in its original form. If a shaft log is in place or still part of the vessel its angle is fixed and both the. With the strut bearing in place permanently our shaft is now finished machined to the exact length with the coupling installed.

Back to the vessel and we now do a feeler gauge alignment between the engine and shaft. The shaft angle is determined by the size of the propeller the size of the engine the type of gear box and the total arrangement of everything. First you need to know the diameter of the propeller and approximately where it will go underneath the boat.

The system uses a high-density carbongraphite flange that is attached to the boats stern tube also called a shaft log by a nitrile bellows that uses water pressure to create a 100 watertight seal. Shafts Seals. Full line of Buck Algonquin shafts logs including.

Triangular Offset Type Fiberglass Hull Self Aligning Cast Bronze Square Base and Offset Type Log Only. All of the Buck shaft logs that we carry are made in the USA and are covered by Buck Algonquins limited warranty. This tip was written in response to a Bertram 31 but the basic discriptions and proceedures will apply to any boat.

The components are two heavy wall fiberglass shaft log tubes available from Lewis Marine in Miami fig 9585. You will select two sizes. Should be 12 larger than the diameter of your shaft.

Mix up some putty with cabosil and resin or epoxy whatever you want to use back of the shaft log enough to sand the sternpost wipe it with acetonewax the box so you can back it off after its cured and put the putty on there and get where you want it let it harden. There are three parts to the device. The shaft log that attaches to the inside bottom of the boat the Stuffing box the topic of this article and the flexible hose connector that attaches the two together.

Keep an eye on this rubber connector. Check it in the spring. Cracks and breaks can occur after a time.

A fitting in the hull bottom that contains the propeller shaft. STRUT. A term applied to a bracket supporting the outboard after end of the propeller and the propeller in twin or multiple-screwed vessel s having propeller.

SHAFT LOGS SELF ALIGNING SHAFT LOGS - CAST BRASS OR ALUMINUM 9 Degree Log. Base Size 3½ x 18¾ Item No. Aluminum Log 172 Aluminum Log - Polished 176 Bronze Log 180 Bronze Log - Chrome 183 12 Degree Log.

Home Inboard Hardware Shaft Logs and Parts Prop shaft stuffing boxes are meant to be used in conjunction with a Shaft Log that it is attached to it with a hose and clamps. See Glens article about packing type stuffing boxes and also his article about seal type boxes. Many experienced boat operators permanently â installâ a grease gun aboard by mounting it on an adjacent bulkhead above the shaft log seal.

Then when the shaft is leaking a little too much they can simply reach over and pump the grease gun a couple of times and the leak disappears. This little trick makes about 95 percent of those pesky. All of the prop shaft seals mentioned work well.

Like all the other parts on your v-drive they do need to be checked and greased on a regular basis. Bergeron Marine 480-834-1531 also sells one that works really well. Theirs doesnt require grease but because of its design does require more room between the shaft log and safety collar.

The basic components of a boats stuffing box are a cylindrical enclosure slightly larger than the propshaft that is typically constructed of brass or bronze and is threaded at one end to accept a compression nut and a lock nut. Packing which is usually braided fiber treated with wax or a similar substance to make it waterproof and lower its frictional resistance. And a rubber hose that attaches the stuffing box to the shaft log.

The propeller shaft ran through a long hollowed out timber that entered the engine compartment hence the term shaft log. The process of molding these hulls out of fiberglass created a huge empty void space in the keelskeg area. The previous owner was really good about keeping all the onboard equipment manuals together and they came with the boat.

The only information I dont have is on the shaft log pictured below. I have owned the boat for ten years and have never serviced it other than replacing the water line that comes from the engine. I have a 1970 35-2 154 Betty that recently suffered a catastrophic failure of the stuffing box hose and or prop shaft log.

After years of deferred maintenance the shaft coupler is siezed to the shaft. For this reason I was advised by the local yard in February not to try to attempt to adjust the stuffing box. Cassell Marine the boating specialists since 1971 We stock Australias largest range of inboard boating hardware and parts Boat water pumps and Impellers.

Running gear from Shafts to Propellers Rudders to Log Glands. General Boat Parts Race Boat Hardware Wake Boat Parts Marine Exhaust Components Marine Hose. The boat has a sump in the bilge a hollow area in the keel with a hydraulic drive motor in it.

The propeller shaft exits the boat through a shaft log at the aft end of the sump and then passes through approximately 2 feet of fiberglass before it exits at the trailing edge of the fin keel. The leak originates inside of this tunnel through the keel. We confirmed this by.

Both companies report regularly seeing commercial vessels with 6000 to 8000 hours on a seal. In some cases especially with shafts made of lower alloys of stainless or excessively vibrating engines the lip seal can create a wear groove on the shaft preventing the seal from seating properly since the shaft diameter has been reduced slightly. A similar process is employed for bearings that reside within a shaft log and strut.

The bearing itself is waxed and set in epoxy and wedges are used to position it so that it remains parallel with and centered on the shaft line until the epoxy cures. All bearings should be a light press fit in the shaft log or strut.