Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 22-09-2009, 21:09   #1
Registered User
 
cmesiam's Avatar

Join Date: Feb 2009
Location: Norfolk, VA
Boat: 1970 Morgan 40
Posts: 27
Send a message via AIM to cmesiam
Is it My Stuffing Box?

Lost propulsion last weekend and thought I lost the Prop. Prop is still attached to shaft but entire prop and shaft slide in and out (rddr kept it from falling all of the way out). Is that the stuffing box? Yes, I've read the other post about stuffing box and how to do it. I'm still not sure that is my problem?
I have a 'clamp' with two screws. I didnt take it off yet, but intend to later this weekend. Has my shaft slide out of the stuffing box because it was worn out? If I repack will it stay?

Any info would be helpful at this point? Thanks in advance.

Bruce
bruce.hansen@navy.mil or cmesiam@aol.com
__________________

__________________
cmesiam is offline   Reply With Quote
Old 22-09-2009, 21:19   #2
Registered User
 
Sailabel's Avatar

Join Date: May 2006
Location: Home Base: Seattle; Currently Cruising in Mexico
Boat: Tayana 37- Victoria Rose
Posts: 151
Hi Bruce.... no, probably not the stuffing box. The stuffing box is the 'water-tight' (not really watertight, but you know what I mean) seal where the prop-shaft exits the hull. The end of the shaft is usually attached to the transmission with a coupling. My guess is that the bolts that hold the shaft into the coupling have come loose, allowing the entire shaft/prop to slide back. The shaft (at least on my boat) is held tight in the coupling with two 'set bolts': bolts that have a pointed end and are run in tight against the shaft to hold it in place. As a side note, the shaft is also 'keyed' in position so it can't rotate. The 'set bolts' should then be wired so they can't come loose.

To check, climb in to where the shaft meets the transmission.... I'll bet that the whole shaft just came loose at the coupling.

If so, repacking the stuffing box won't have any effect. The good news is that this isn't really uncommon and is an easy fix while still in the water.
__________________

__________________
Steve Abel
SV Victoria Rose, Tayana 37
www.sailvictoriarose.com
Sailabel is offline   Reply With Quote
Old 23-09-2009, 07:27   #3
Registered User

Join Date: May 2009
Posts: 41
Sailable is correct. There should be an indent on the shaft where the two bolts that go thru the coupling are located. What may have happened is one or both of the coupling bolts loosened and allowed the key to fall out of the keyway on the shaft. Its probably in the sump under the coupling.
__________________
karlhead is offline   Reply With Quote
Old 23-09-2009, 07:29   #4
Registered User

Join Date: May 2009
Posts: 41
I forgot........the 2 bolts on split flange coupling are supposed bo safety wired to prevent this exact th;i;ng from happening again.
__________________
karlhead is offline   Reply With Quote
Old 23-09-2009, 08:20   #5
Registered User
 
cmesiam's Avatar

Join Date: Feb 2009
Location: Norfolk, VA
Boat: 1970 Morgan 40
Posts: 27
Send a message via AIM to cmesiam
All,

OK, I'm going to look at that connection. I will head out there tonight and have a look.

Do any of you know about a grease fitting on the (what I believe) is the stuffing box?

Thanks for all,
Bruce
__________________
cmesiam is offline   Reply With Quote
Old 23-09-2009, 09:04   #6
Registered User

Join Date: Oct 2006
Location: Nanaimo, BC
Boat: C&C 41
Posts: 346
The stuffing box is lubricated by leaking a little water when turning. After you fix your coupler, run the engine in gear and observe the box. It should drip about twice a minute. If not, tighten or loosen it accordingly. If excessive drip, you need to re-pack. A simple job but has to be done out of the water.
__________________
Rex Delay is offline   Reply With Quote
Old 23-09-2009, 09:13   #7
Registered User

Join Date: Aug 2006
Location: Leucadia, California
Boat: Stevens 47 Komaru
Posts: 428
Quote:
The 'set bolts' should then be wired so they can't come loose.
A better practice is to drill through the shaft at one of the set bolts and insert a bolt all of the way through the shaft and the flange. Do this after you have inserted the key and the other set bolt.
__________________
Stevens 47 is offline   Reply With Quote
Old 23-09-2009, 09:39   #8
S&S
Registered User
 
S&S's Avatar

Join Date: Jul 2009
Boat: 48' 1963 S&S yawl
Posts: 851
Images: 6
Quote:
Originally Posted by Stevens 47 View Post
A better practice is to drill through the shaft at one of the set bolts and insert a bolt all of the way through the shaft and the flange. Do this after you have inserted the key and the other set bolt.


Only if you want your shaft to break. Drilling that hole probably weakened the shaft by 70%

Not A Good Idea.
__________________
S&S is offline   Reply With Quote
Old 23-09-2009, 10:05   #9
Senior Cruiser
 
Sailmonkey's Avatar

Cruisers Forum Supporter

Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 5,781
Some stuffing boxes have a grease zerk on them. I would heasitate to use it on a pleasure craft, you're better off just letting a few drips per minute come through when the shaft is turning. The grease is widely used on commercial vessels, but the mess surrounding the shaft packing on larger vessels is pretty undesireable on a pleasure craft.
__________________
Sailmonkey is online now   Reply With Quote
Old 23-09-2009, 11:22   #10
Registered User

Join Date: Aug 2006
Location: Leucadia, California
Boat: Stevens 47 Komaru
Posts: 428
Quote:
Only if you want your shaft to break. Drilling that hole probably weakened the shaft by 70%

Not A Good Idea.
Not true through bolting is recommended practice as per Nigel Calder's book.
__________________
Stevens 47 is offline   Reply With Quote
Old 23-09-2009, 12:28   #11
S&S
Registered User
 
S&S's Avatar

Join Date: Jul 2009
Boat: 48' 1963 S&S yawl
Posts: 851
Images: 6
Quote:
Originally Posted by Stevens 47 View Post
Not true through bolting is recommended practice as per Nigel Calder's book.
Then Nigel is wrong too. Loss of material strength is not author dependent.
__________________
S&S is offline   Reply With Quote
Old 23-09-2009, 18:03   #12
Eternal Member
 
Chief Engineer's Avatar

Join Date: Aug 2006
Location: North of Baltimore
Boat: Ericson 27 & 18' Herrmann Catboat
Posts: 3,798
My observations:

GFO packing does not require "dripping"
I have done everything from 18 foot catboats to 95 foot Tugboat stuffing boxes in the water.
Though bolting a sailboat shaft? Bad idea. One inch shaft minus 3/8 bolt= 5/16 of shaft on either side of hole. Big shaft.....I have seen that a lot....usually a drift pin

Some shaftlogs have a grease fitting on them because water does not come far enough up the shaft or the toreancle between shaft and stuffing box is close....

I see this on a number of foreign bottoms.
__________________
Chief Engineer is offline   Reply With Quote
Old 24-09-2009, 04:40   #13
Registered User
 
cmesiam's Avatar

Join Date: Feb 2009
Location: Norfolk, VA
Boat: 1970 Morgan 40
Posts: 27
Send a message via AIM to cmesiam
ALL,

I have found the issue. At the transmission, bolted with three bolts is a an iron 'collar' whhere the shaft slides into with a key. Then there are two (allen, hex) screws which were in bad shape. Also the key was brass and completely 'shaved' in half lenghtwise. To repair, appears simple: replace the key and set screws and reassemble. I think I could be steaming by the weekend. I'd like to tank all for their assistance. Coudnt have done it with out all of you.

Thanks again,

Bruce
__________________
cmesiam is offline   Reply With Quote
Old 24-09-2009, 11:09   #14
Registered User
 
Fishspearit's Avatar

Join Date: Jan 2006
Location: FL
Posts: 576
Some tips when putting it back together: As you found out, when you put it in reverse those set screws are the only thing holding the shaft in the coupling. It helps to take a sharp punch and dimple the shaft where set screws hit, so that they bite in a little deeper. Also, be sure to put loc-tite on the set screws since they like to vibrate out.
__________________

__________________
www.LionfishHunting.com
Fishspearit is offline   Reply With Quote
Reply

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Metric Stuffing Box mikereed100 Propellers & Drive Systems 15 12-03-2013 13:52
Need Stuffing Box Help TOM Propellers & Drive Systems 8 12-09-2009 22:34
Stuffing box or re-stuffing the box / dripless Dave in Eugene General Sailing Forum 10 28-12-2007 16:45
Stuffing box help Iain Propellers & Drive Systems 18 30-08-2007 07:32
Stuffing box challenged! ssullivan Construction, Maintenance & Refit 25 30-01-2007 17:08



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 20:02.


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.