Shaft logs

[Calivanos]

Okay so do Marinettes have shaft logs or are those just pipes that have been welded in? My port side pipe/shaft log is the last of my hull or drivetrain issues. I can stick my finger through it. What should I do?
Help!

[bill]

Aluminum pipe welded in place
Find a friend who knows how to weld aluminum or buy a sh%$ load of JB Weld.
bill

[barkleydave]

First: Why can you stick your hand through it? Corrosion, Damage?

The log MUST align properly with the strut. If not welded properly or out of alignment... it will not last long and will further complicate operation.
The shaft DOES NOT TOUCH THE LOG.
The log also need to be the same grade aluminum as the hull.

With all the workboats used in Texas it should not be difficult to find a marine yard that can repair the log without issue.

safe boating,

dave

[Calivanos]

Yes sir corrosion damage, ate right through what appeared to be a weld.

[vtomica]

What is a shaft log?

[Maestro]

vtomica - a shaft log on a Marinette is essentially an aluminum pipe that the propshaft travels through in order to exit the hull. As Dave mentioned above, the propshaft does not actually touch this tube at all. A watertight seal is created by the packing gland which is tightened on the shaft and is clamped to the shaft log.

If you google image search "shaft log diagram" you'll quickly see how it works.

[Calivanos]

I wanted to share the final product. This is the starboard shaft log. I had extensive damage on the port side and welded thin plate over it. Bill said use a $h1tload of JB weld and I decided to do just that as well. For good measure I pored about a 1/2 inch on the starboard side as PO had obviously tinkered around there. Now both look like this.
(It's Belzona by the way) radical industrial stuff sort of like JB Weld

[collins69s]

That Belzona seems like some bada$$ stuff. Did some research on it. Which product did you use?
Thanks!
Sean

[Calivanos]

I had all sorts of ideas as I have witnessed repairs to hydrocarbon processing units and even seen machined parts. The Belzona folks talked me into pouring in 5831 to a thickness of about an inch. I am in awe of the strength. I have never seen anything like it. Built in galvanic corrosion protection a plus. A tech offshore claimed he would dip a brush in it and brush pipe stantions submerged in salt water and It would still stick and cure. Warning though it is more expensive that you can imagine. 500-750 gallon