Prop Shaft Seal question

coastie1160870
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Prop Shaft Seal question

Postby coastie1160870 » Wed May 02, 2018 10:50 pm

Hello All, I know that I have a 1" prop shaft, I know I need a new shaft seal..( It Leaks )... What I don't know is what the thrugh hull end of the set is..? Does anyone know what size the tube is going through the bottom of the boat..? PLEASE HELP ..!
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R.A. Campbell
1968, 32 Express w/o F-B.
Twin 225's,
Catawba Island, Port Clinton Ohio
Purchased " C-WAVES " on 07-03-2017
new name same boat, spring of 2018

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Busia
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Re: Prop Shaft Seal question

Postby Busia » Wed May 02, 2018 11:12 pm

That piece of pipe welded into the hull is called the shaft log. Doesn't matter what size it is, you're not going to do any thing to it. What you have is a packing gland that seals the rotating shaft. It should leak about one drip every few seconds while the shaft is spinning. It has to drip to lubricate the shaft. If it drips too much you can tighten the packing. Loosen the jam nut and tighten the packing nut. Then tighten the jam nut. If you have it too tight the shaft will get hot as it spins. If you can't tighten it to stop the leaking you will have to change the packing. You should have 1/4" X 1/4" packing. Not a complex job, but awkward to reach. There are threads on this site on how to do it.
BUSIA
located in Ketchikan, Alaska. Gods country
32 foot Marinette express. (no fly bridge)
twin 350 Crusader (Chev 350) engines
1:1 Borg Warner velvet drive transmissions
Closed cooling (antifreeze in the engine)
Proud to be retired IBEW

coastie1160870
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Re: Prop Shaft Seal question

Postby coastie1160870 » Thu May 03, 2018 1:37 am

Thanks, But... What I have is a "DRIPLESS" shaft seal with a water line going back to the engine, not a traditional stuffing box.. The rubber boot as I recall, seals on the Shaft Log, and the bushing seals to the shaft. There is some presure put aginist the bushing to seal it, as it turns.. Now keep in mind, this is how it looks to me, from the deck height, and memory of last year.. If no one knows what the ends measure then I'll have to drive up to the boat, drag a ladder, climb up and in, make measurements.. which is a little bit of a challenge for me, being a double amputee.. But I hate to pay someone to fix it, if I can do it...
R.A. Campbell
1968, 32 Express w/o F-B.
Twin 225's,
Catawba Island, Port Clinton Ohio
Purchased " C-WAVES " on 07-03-2017
new name same boat, spring of 2018

EWRice
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Re: Prop Shaft Seal question

Postby EWRice » Thu May 03, 2018 9:41 am

You should only need the brand of seal and shaft diameter to order a replacement. Unless the hose/bellows needs to be replaced because of a tear. If my memory serves me right, the shaft log is 1.875" o.d.
Muskegon Lake
1972 32' Express flybridge
"AL13"
Twin 318s
On board air & prime 920
1963 Thompson Super Sea Lancer
Graymarine 327
1961 Alumacraft 12'
'55 10hp Johnson

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Busia
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Re: Prop Shaft Seal question

Postby Busia » Thu May 03, 2018 12:05 pm

As Emily would say " Never mind".
BUSIA
located in Ketchikan, Alaska. Gods country
32 foot Marinette express. (no fly bridge)
twin 350 Crusader (Chev 350) engines
1:1 Borg Warner velvet drive transmissions
Closed cooling (antifreeze in the engine)
Proud to be retired IBEW

Rockit
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Joined: Sat Jul 12, 2014 8:26 pm
Location: Phoenix, AZ

Re: Prop Shaft Seal question

Postby Rockit » Thu May 03, 2018 9:56 pm

I have to be missing something. How do you check the stuffing box while the shaft is turning? Do you do it while the boat is moving? I can't see shaft drips from the deck so I have to do it in the engine compartment with a time piece. Dong this while underway strikes me as very unsafe. I check it when the shaft is not turning (and the engines are off) and figure it should drip about once every 60-90 seconds.

Wisdom will be welcomed.

Thank you.
Joe Napoli
1977 28' Express
Twin raw water cooled 318s
Beaver River--near mile 25 on the Ohio

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Busia
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Re: Prop Shaft Seal question

Postby Busia » Fri May 04, 2018 3:34 am

To work on the boat by myself all I do is make sure it is tied to the dock securely. I can put it in gear and add power slowly. Then just pull against the dock. Hopefully the shafts won't drip when they are not turning and just a little when they do turn. Better too loose than too tight.
BUSIA
located in Ketchikan, Alaska. Gods country
32 foot Marinette express. (no fly bridge)
twin 350 Crusader (Chev 350) engines
1:1 Borg Warner velvet drive transmissions
Closed cooling (antifreeze in the engine)
Proud to be retired IBEW

Rockit
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Posts: 131
Joined: Sat Jul 12, 2014 8:26 pm
Location: Phoenix, AZ

Re: Prop Shaft Seal question

Postby Rockit » Sat May 05, 2018 10:38 pm

Thank you. Correct, a little water in the bilge from the shaft seal is no big deal.

The boatyard tried to sell me on dripless stuffing boxes, but at $500 a pop, I can live with some bilge water.
Joe Napoli
1977 28' Express
Twin raw water cooled 318s
Beaver River--near mile 25 on the Ohio

coastie1160870
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Re: Prop Shaft Seal question

Postby coastie1160870 » Sun May 06, 2018 8:49 pm

Hi Guys.. I didn't get a choice.. The boat came drip;ess, untill... it wasn't dripless, anymore..! L.O.L. So late in August last year I noticed that everytime we took the boat out, the bilge alarm would come on.. Being that wife was not in to driving the boat, and for other reasons, wasn't a lot of help.. (to no fault of her own, mind you..) I was checking the shafts for water at the dock, every time, before we went out.. NOTHING..! NOT A DROP OF WATER, ANYWHERE.. We would get underway, and BAM..! Bilge Alarm..!! Robert E. Custer II came over and we went for a ride, this time he opened the hatch and there it was.. My inboard water shower..! At the tranny end of the shaft seal, I had a shower going full force, except... as soon as I took the engine out of gear, it stopped.!! SO... Now I'm wondering... do I need to replace the entire thing, ( PSS SHAFT SEAL ) or could I use a repair kit..? The difference is about one hundred dollars, each..! Has anyone ever used a repair kit.? What did it actually do ..? Will that solve my problem... Keep in mind, I'm new to this boat, just bought it last July 3rd.. (2017) Thanks
R.A. Campbell
1968, 32 Express w/o F-B.
Twin 225's,
Catawba Island, Port Clinton Ohio
Purchased " C-WAVES " on 07-03-2017
new name same boat, spring of 2018

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bill
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Re: Prop Shaft Seal question

Postby bill » Tue May 08, 2018 7:15 am

BigM
Have you tried measuring the shaft end play :?: The shaft may be loose in coupling attached to the transmission?
Have someone shift the trans forward and reverse while secured to the dock. Look for fore and aft movement of the shaft.
If this is excessive find and fix the problem.
THEN proceed.
On the mechanical seal the set screws on the front SS collar can be loosed to allow more pressure on the sealing surface of the seal.
Good luck
bill
ALUMINATION
Grosse Ile MI
Located on LakeErie
37' F/B Sedan
1975
Twin 360 Chrysler Marine
Raw water cooled
Hydraulic steering both helms
USCG Master Lic. Retired

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