Packing gland question - SailNet Community
 3Likes
Reply
 
LinkBack Thread Tools
post #1 of 19 Old 06-28-2014 Thread Starter
Junior Member
 
Join Date: Nov 2013
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Packing gland question

Hi all.
I replaced the packing in my PSC 34 and used the special lube in it.
Getting the nut set to the right tension is proving frustrating.
With the nut set to give the target 2~3 drips/min in forward, it will drip a lot when not turning.
With the nut set to not drip when the shaft is not turning, I get no drips when in forward. Leaving it like this and doing a 1.5 hour engine run, the gland did not get hot but still no drips and it is squeeking at the end of this run when turning at ~2k/min rpm.
The difference in nut tension between the two states described is less then 1/2 a turn. Also the gland seems to drip a lot in reverse.
Should I leave it as is? Back off to get some drips and live with the leakage when the shaft is stopped? Thanks for any advise.
Regards, David
dead_short is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 19 Old 06-29-2014
Old enough to know better
 
Join Date: Dec 2006
Location: Beacon, NY
Posts: 3,098
Thanks: 19
Thanked 128 Times in 124 Posts
Rep Power: 9
 
Re: Packing gland question

What was the special lube? Perhaps going back to standard would work better?

Sent from my NookColor using Tapatalk
miatapaul is offline  
Quote Quick Reply Share with Facebook
post #3 of 19 Old 06-30-2014
Not Finished Yet
 
RainDog's Avatar
 
Join Date: Jun 2009
Location: Kemah, TX
Posts: 675
Thanks: 20
Thanked 34 Times in 31 Posts
Rep Power: 7
 
Re: Packing gland question

what did you use for packing material? Mine drips not at all when not turning and just a few drips a minute when turning. I used the Gore Tex GFO Fiber 3/16" packing.

Pacific Seacraft 34 #142

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

RainDog is offline  
Quote Quick Reply Share with Facebook
post #4 of 19 Old 06-30-2014
Not Finished Yet
 
RainDog's Avatar
 
Join Date: Jun 2009
Location: Kemah, TX
Posts: 675
Thanks: 20
Thanked 34 Times in 31 Posts
Rep Power: 7
 
Re: Packing gland question

Quote:
Originally Posted by dead_short View Post
With the nut set to give the target 2~3 drips/min in forward, it will drip a lot when not turning.
This seems surprising. Did you check for excessive scoring on the shaft? Is there possibly a crack or other defect on the nut? This is probably a good question to cross-post to the engine forums if you have not already.

Pacific Seacraft 34 #142

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

RainDog is offline  
Quote Quick Reply Share with Facebook
post #5 of 19 Old 06-30-2014
Closet Powerboater
 
MedSailor's Avatar
 
Join Date: Mar 2008
Location: Anacortes PNW
Posts: 3,556
Thanks: 256
Thanked 111 Times in 100 Posts
Rep Power: 8
 
Re: Packing gland question

As long as it's not getting hot, you're not doing any damage. I say tighten her down a bit. I have had similar issues in the past and they were due to the shaft being out of alignment. If it's not perfectly in the center of the log, it'll never work right. Make sure you're aligned and that your cutlass bearing(s) are still viable.

MedSailor

I have a sauna on my boat, therefore I win.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
MedSailor is offline  
Quote Quick Reply Share with Facebook
post #6 of 19 Old 07-18-2014
Senior Member
 
Join Date: Dec 2013
Location: Orlando
Posts: 109
Thanks: 36
Thanked 5 Times in 5 Posts
Rep Power: 2
 
Re: Packing gland question

I remembered reading this post a bit ago and appreciated the information. The yard at Sail Harbor in Savannah replace my packing with the new teflon packing. On the trip down to Florida, I noticed steady dripping when running in forward and nothing when stopped. I was satisfied with the rate and figured it would improve.

I checked the drip rate the other day and found that I was not getting any drip whatsoever. I immediately felt the shaft and found it to be cool to the touch and I did not notice any unusual sounds.

Should I just be thankful or should I back off the packing nut an 1/8 of a turn and see what happens. I do not want to have the shaft scored or damaged from not having the proper amount of coolant. Thanks.
Hush34 is offline  
Quote Quick Reply Share with Facebook
post #7 of 19 Old 07-19-2014
Closet Powerboater
 
MedSailor's Avatar
 
Join Date: Mar 2008
Location: Anacortes PNW
Posts: 3,556
Thanks: 256
Thanked 111 Times in 100 Posts
Rep Power: 8
 
Re: Packing gland question

Be thankful. The mechanism of damage is friction which wears away at the shaft and creates a groove. No/little friction = no/little heat. I've used the teflon stuff before with no drips and had no issues. It is intrinsically a lower friction material, so it relies much less on the water for lubrication and cooling.

MedSailor

I have a sauna on my boat, therefore I win.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
MedSailor is offline  
Quote Quick Reply Share with Facebook
The Following User Says Thank You to MedSailor For This Useful Post:
Hush34 (07-19-2014)
post #8 of 19 Old 01-19-2015
Junior Member
 
Join Date: Jan 2014
Location: Wayne, ME
Posts: 13
Thanks: 6
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Re: Packing gland question

Hello to all. I am a recent new owner of a 1987 psc 34 (hull 89 Athenry) and am in the process of replacing the packing material. I went with the Teflon ptfe packing. Today I removed 2 rings of 1/4 inch goretex packing. Raindog and others use 3/16 inch. It's a 1 inch shaft. Should I try for three rings of 3/16 inch or stay with two rings of 1/4? I have both available but am unclear as to what is optimal. Many thanks, Nate
nateinmaine is offline  
Quote Quick Reply Share with Facebook
post #9 of 19 Old 01-19-2015
Closet Powerboater
 
MedSailor's Avatar
 
Join Date: Mar 2008
Location: Anacortes PNW
Posts: 3,556
Thanks: 256
Thanked 111 Times in 100 Posts
Rep Power: 8
 
Re: Packing gland question

Quote:
Originally Posted by nateinmaine View Post
Hello to all. I am a recent new owner of a 1987 psc 34 (hull 89 Athenry) and am in the process of replacing the packing material. I went with the Teflon ptfe packing. Today I removed 2 rings of 1/4 inch goretex packing. Raindog and others use 3/16 inch. It's a 1 inch shaft. Should I try for three rings of 3/16 inch or stay with two rings of 1/4? I have both available but am unclear as to what is optimal. Many thanks, Nate
You absolutely MUST use the correct size. Otherwise bad things will happen.

From my experience and research I believe in old fashioned flax packing.

1: Graphite packing (black in color) is to galvanically active and will destroy your shaft while sitting at the doc unless you allow it to constantly drip at the dock.

2: PTFE packing (white in color) has the advantage of keeping things cooler BUT IF IT EVER GETS HOT the PTFE expands significantly in size and will wear rings in your shaft. Heat expansion is a big problem with this stuff.

3: Flax packing doesn't have the expansion or galvanic problems and works well. As a bonus it's the cheapest and easiest to find.

MedSailor

I have a sauna on my boat, therefore I win.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
MedSailor is offline  
Quote Quick Reply Share with Facebook
post #10 of 19 Old 01-19-2015
Senior Member
 
Maine Sail's Avatar
 
Join Date: Jan 2003
Location: Maine Coast
Posts: 5,877
Thanks: 20
Thanked 219 Times in 167 Posts
Rep Power: 16
       
Re: Packing gland question

Quote:
Originally Posted by MedSailor View Post
You absolutely MUST use the correct size. Otherwise bad things will happen.

From my experience and research I believe in old fashioned flax packing.

1: Graphite packing (black in color) is to galvanically active and will destroy your shaft while sitting at the doc unless you allow it to constantly drip at the dock.

2: PTFE packing (white in color) has the advantage of keeping things cooler BUT IF IT EVER GETS HOT the PTFE expands significantly in size and will wear rings in your shaft. Heat expansion is a big problem with this stuff.

3: Flax packing doesn't have the expansion or galvanic problems and works well. As a bonus it's the cheapest and easiest to find.

MedSailor
In order to expand a PTFE product enough to cause damage you'd have to be so far out of adjustment that it is not even realistic.... Most "PTFE" marine packing products are not made actually from PTFE extrusion yarns, they are acrylic/PTFE impregnated or flax/PTFE impregnated. Remember despite whta the glossy ads suggests all traditional packing boxes are water lubricated even if they don't drip noticeably.

The Gore stuff is 100% a PTFE base that is extruded with graphite in the PTFE mix into PTFE/graphite yarns. IMHO there is no real need for the graphite and it only serves to create galvanic issues and shorter zinc life. They really could have achieved the same means with a true PTFE packing not a PTFE impregnated acrylic or PTFE impregnated flax...
MedSailor likes this.

______
-Maine Sail / CS-36T


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.




Images In Posts Property of Compass Marine Inc.


Maine Sail is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
packing gland mrkeith Gear & Maintenance 37 02-14-2015 10:15 AM
Packing gland grease watom Gear & Maintenance 5 08-31-2008 02:56 PM
Packing gland bestfriend Gear & Maintenance 3 05-08-2007 12:27 AM
Packing Gland 1970Columbia34 Gear & Maintenance 2 04-10-2007 11:40 AM
Packing gland??????? wildcard Gear & Maintenance 45 01-30-2007 02:39 PM

Posting Rules  
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome