Anyone had to replace the shaft tube on a single 40 sundeck?

[douggairns]

M.T. 40 sundeck with 135 single Lehman supposedly has a bad prop shaft tube allowing water seep into the bilge, but not through the stuffing box?
I have not been able to find any information on how the old tube comes out?
Thanks, any help would be appreciated,

 

[CharlieO.]

I just completed this project on my 1977 Marine Trader 34DC. My stainless tube was threaded into the inner bronze support piece that is bolted to a crossmember in the engine room. I am not sure how I could of unscrewed it nor did I know that is how it was assembled. I didn't learn about how it was assembled until I got it all out.

I now have a new fiberglass tube with a cutlass bearing on the inner end and they remachined my inner support.

You can look at some of my previous posts for a few pictures.

 

[douggairns]

I just completed this project on my 1977 Marine Trader 34DC. My stainless tube was threaded into the inner bronze support piece that is bolted to a crossmember in the engine room. I am not sure how I could of unscrewed it nor did I know that is how it was assembled. I didn't learn about how it was assembled until I got it all out.

I now have a new fiberglass tube with a cutlass bearing on the inner end and they remachined my inner support.

You can look at some of my previous posts for a few pictures.

Thanks, Charlie, I just bought this, it's in the water, was told there was a leak, I assumed it was packing for stuffing boxes, but no, apparently theres a tube that the shaft runs in, to cool the seals and bearings, I'm used to outdrives, I figured there was water between the stuffing box and the shaft where it comes out of the back of the boat, but no idea how it worked.I guess I'll have to pull it out of the water, #1, i will try and go back through your posts and see if the answers there!

 

[douggairns]

Wow, Got a 10 ft pc of 2.5in 316 ss tube,, a 2,5" holesaw, some half in threaded rod, ran the hole saw up the old F/G tube cleaning up the messed up glass. Got it cleaned up enough the SS tube slid right up into the engine compartment. Now we have to figure out the correct dime4nsions for the length of the tube and then we also have to have both support ends machined out to take the tubing, we'll hjave to have them grooved for some o-rings, and some slots cut in the rear of the tube for the water outlet. Seems so much quicker and easier when you only have to write what got done so far, back sure hurts lol
It's lookin better Charlie! Hope the waters great this Weekend for ya!

 

[lwarden]

Deleted

 

[douggairns]

No, the plan is to have the ends machined and grooved to install o-rings to seal the tube on both ends.
That way the metals won't be touching. It's the same stainless tubing they use in pharmacutical, chemical and dairy plants, should last for a while.