Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 14-05-2013, 23:03   #1
Moderator
 
Dockhead's Avatar

Cruisers Forum Supporter

Join Date: Mar 2009
Location: Cowes (Winter), Baltic (Summer) (the boat!); somewhere in the air (me!)
Boat: Cutter-Rigged Moody 54
Posts: 19,751
Dripless Shaft Seal Inspection & Maintenance?

I have a dripless shaft seal on my boat. It is the type which has a raw water feed from the main engine. I have never had one of these before -- always had normal dripping seals with packing which needed regular fussing.

It has never given me a moment's trouble, which worries me (seems not normal for anything on a boat not to cause some problem sooner or later). It will soon be 12 years old (my boat was commissioned in 2001); about 1500 engine hours.

My boat was out of the water over the winter, and I had a reputable marine engineer inspect it, plus the steering gear, rudder bearings, and rudder seals.

He lubricated and adjusted the steering cables, but pronounced everything else to be fit for service.

What to watch out for with these? Can they really last this long? Do you guys inspect your seals? What to look for?
__________________

__________________
Dockhead is online now   Reply With Quote
Old 14-05-2013, 23:40   #2
CF Adviser
 
Bash's Avatar

Cruisers Forum Supporter

Join Date: Dec 2008
Location: sausalito
Boat: 14 meter sloop
Posts: 7,260
Re: Dripless Shaft Seal Inspection & Maintenance?

Quote:
Originally Posted by Dockhead View Post
What to watch out for with these?
Watch for when they start to drip.
__________________

__________________
cruising is entirely about showing up--in boat shoes.
Bash is offline   Reply With Quote
Old 14-05-2013, 23:43   #3
Moderator
 
Dockhead's Avatar

Cruisers Forum Supporter

Join Date: Mar 2009
Location: Cowes (Winter), Baltic (Summer) (the boat!); somewhere in the air (me!)
Boat: Cutter-Rigged Moody 54
Posts: 19,751
Re: Dripless Shaft Seal Inspection & Maintenance?

Quote:
Originally Posted by Bash View Post
Watch for when they start to drip.
Is that all? Sounds far too simple. ..
__________________
Dockhead is online now   Reply With Quote
Old 14-05-2013, 23:48   #4
CF Adviser
 
Bash's Avatar

Cruisers Forum Supporter

Join Date: Dec 2008
Location: sausalito
Boat: 14 meter sloop
Posts: 7,260
Re: Dripless Shaft Seal Inspection & Maintenance?

Quote:
Originally Posted by Dockhead View Post
Is that all? Sounds far too simple. ..
I suppose it's also a bad sign when they begin to glow in the dark.
__________________
cruising is entirely about showing up--in boat shoes.
Bash is offline   Reply With Quote
Old 14-05-2013, 23:53   #5
Senior Cruiser
 
delmarrey's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Now in Blaine, WA
Boat: Modified Choate 40
Posts: 10,702
Images: 122
Re: Dripless Shaft Seal Inspection & Maintenance?

PYI's (PSS) recommends replacing the bellows every 6 years, but 10 years is not unheard of. If yours is a PSS I'd be looking into a bellows change.

PSS Shaft Seal
__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
A nation of sheep breeds a government of wolves!

Unprepared boaters, end up as floatsum!.......
delmarrey is offline   Reply With Quote
Old 15-05-2013, 00:27   #6
Registered User
 
sww914's Avatar

Join Date: May 2009
Location: Punta De Mita
Boat: Vagabond 39 Hull # 1
Posts: 1,842
Re: Dripless Shaft Seal Inspection & Maintenance?

I had a boatyard friend who, if the normal adjustment wouldn't stop the leaking, would slide 1200 grit wet sandpaper between the carbon and stainless blocks, and gently sand both sides for a few minutes. He said that he had 100% success with only one exception when the carbon was cracked on one.
__________________
Steve
http://www.landfallvoyages.com
sww914 is offline   Reply With Quote
Old 15-05-2013, 01:42   #7
Moderator
 
Dockhead's Avatar

Cruisers Forum Supporter

Join Date: Mar 2009
Location: Cowes (Winter), Baltic (Summer) (the boat!); somewhere in the air (me!)
Boat: Cutter-Rigged Moody 54
Posts: 19,751
Re: Dripless Shaft Seal Inspection & Maintenance?

Quote:
Originally Posted by delmarrey View Post
PYI's (PSS) recommends replacing the bellows every 6 years, but 10 years is not unheard of. If yours is a PSS I'd be looking into a bellows change.

PSS Shaft Seal
I'm at 12 years, as far as I know. The bellows look like new, but I guess this is good advice.
__________________
Dockhead is online now   Reply With Quote
Old 15-05-2013, 02:04   #8
Registered User
 
Quintessa's Avatar

Join Date: Apr 2013
Location: Gold Coast Australia
Boat: Powercat Stanyon 14 m
Posts: 36
I replaced mine at 9 years and they looked fine in the boat. When we pulled them out they were at end of their life and glad to replace them. Would well and truly be replaced them now and soon than later.
__________________
Quintessa is offline   Reply With Quote
Old 15-05-2013, 02:51   #9
Moderator
 
Dockhead's Avatar

Cruisers Forum Supporter

Join Date: Mar 2009
Location: Cowes (Winter), Baltic (Summer) (the boat!); somewhere in the air (me!)
Boat: Cutter-Rigged Moody 54
Posts: 19,751
Re: Dripless Shaft Seal Inspection & Maintenance?

Quote:
Originally Posted by Quintessa View Post
I replaced mine at 9 years and they looked fine in the boat. When we pulled them out they were at end of their life and glad to replace them. Would well and truly be replaced them now and soon than later.
The reputable marine engineer I paid to inspect mine might have told me that, eh, while I was still on the hard?

Can it be done with the boat in the water?
__________________
Dockhead is online now   Reply With Quote
Old 15-05-2013, 03:30   #10
Moderator
 
noelex 77's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Location: Living on dirt waiting for our new yacht to be built.
Boat: Half built Bestevaer.
Posts: 10,619
Re: Dripless Shaft Seal Inspection & Maintenance?

I replaced my PSS when it 9 years old.
Compared with the new one the bellows had lost some of their elasticity and spring, but it looked a long way from any risk of catastrophic failure from the bellows tearing.


PSS recommend every 5 years. I think they are being very conservative, but if it is now 12 years old I would replace it at the next haul out.

Its not a job that can be done in the water.

On some boats the prop, needs to be removed to slide the propshaft back far enough.

Keep oil and grease away from rubber bellows.
__________________
noelex 77 is offline   Reply With Quote
Old 15-05-2013, 04:23   #11
Registered User
 
Kestrahl's Avatar

Join Date: Jun 2012
Location: Malaysia
Boat: Laurie Davidson 35
Posts: 262
Quote:
Originally Posted by noelex 77 View Post
I replaced my PSS when it 9 years old.
Compared with the new one the bellows had lost some of their elasticity and spring, but it looked a long way from any risk of catastrophic failure from the bellows tearing.

PSS recommend every 5 years. I think they are being very conservative, but if it is now 12 years old I would replace it at the next haul out.

Its not a job that can be done in the water.

On some boats the prop, needs to be removed to slide the propshaft back far enough.

Keep oil and grease away from rubber bellows.
i had mine off two days ago with the boat in the water. was able to slide the shaft back enough to take it off the front. had a pvc sock and two hose clamps to stop the water pouring in once off
__________________
Kestrahl is offline   Reply With Quote
Old 15-05-2013, 04:39   #12
Registered User

Join Date: Dec 2009
Posts: 3,016
Images: 4
Before removing the bellows jump in and plug up the inlet, whatever it may be, as best you can. A rag should work. Do this after pushing the shaft aft. No need for a haulout.
__________________
daddle is offline   Reply With Quote
Old 15-05-2013, 05:25   #13
Moderator
 
noelex 77's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Location: Living on dirt waiting for our new yacht to be built.
Boat: Half built Bestevaer.
Posts: 10,619
Re: Dripless Shaft Seal Inspection & Maintenance?

I guess I get too nervous with water spurting into the boat
__________________
noelex 77 is offline   Reply With Quote
Old 15-05-2013, 05:46   #14
Moderator
 
Dockhead's Avatar

Cruisers Forum Supporter

Join Date: Mar 2009
Location: Cowes (Winter), Baltic (Summer) (the boat!); somewhere in the air (me!)
Boat: Cutter-Rigged Moody 54
Posts: 19,751
Re: Dripless Shaft Seal Inspection & Maintenance?

Quote:
Originally Posted by noelex 77 View Post
I guess I get too nervous with water spurting into the boat
Hah, me too!

I come out briefly every two months for a scrub off, anyway. Can it be done in 45 minutes? That's how long I get to do whatever I need to do below the waterline, according to my price plan.
__________________
Dockhead is online now   Reply With Quote
Old 15-05-2013, 05:53   #15
Registered User

Join Date: Sep 2009
Location: Chesapeake Bay
Boat: Bristol 45.5
Posts: 25
Re: Dripless Shaft Seal Inspection & Maintenance?

Dockhead, I know of a case where the PSS shaft seal failed and nearly sunk the boat. The insurance company refused to pay as it was part of the "wear and tear" exclusion. On Pearl I have the entire unit replaced or rebuilt by a reputable boatyard every 5-6 years.

Keith
__________________

__________________
S/V Pearl is offline   Reply With Quote
Reply

Tags
inspection, maintenance, paracelle

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 04:01.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.