Stuffing box temperature - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 


Like Tree3Likes
Reply
 
LinkBack Thread Tools
  #1  
Old 07-05-2012
Member
 
Join Date: Jun 2011
Location: Northwest Ohio
Posts: 94
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 4
Ajay73 is on a distinguished road
Stuffing box temperature

I had a diesel tech service my 1980 Universal 5411 in my Catalina 27 and do an engine alignment. As a part of that new packing was put in the stuffing box. After a "shakedown" run I was looking at the stuffing box for how much water was dripping (or had dripped) from the box. The stuffing box was very hot. I mentioned it to him and he said to give it another run as the packing is new and see what happens. A second run resulted in the same condition - very hot. My question is how hot should the stuffing box get when you are running the engine, motoring along?
Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 07-05-2012
JimsCAL's Avatar
Senior Member
 
Join Date: May 2007
Location: Glen Cove, NY
Posts: 2,497
Thanks: 2
Thanked 46 Times in 42 Posts
Rep Power: 8
JimsCAL is on a distinguished road
Re: Stuffing box temperature

Very hot is not good. Slightly warm is OK. How fast is the dripp when running and when stopped?
sawingknots likes this.
Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 07-05-2012
Tim R.'s Avatar
Senior Member
 
Join Date: Mar 2003
Location: Portland, Maine
Posts: 1,542
Thanks: 1
Thanked 27 Times in 26 Posts
Rep Power: 12
Tim R. is on a distinguished road
Re: Stuffing box temperature

First, you need to determine exactly what "very hot" is. Use an IR thermometer. Your local HW store or Radio Shack should have them for about $25.

Mine runs with new packing at about 105įF.
__________________
Tim R.
Out cruising
1997 Caliber 40LRC

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

-----------------------------------------------------
Reply With Quote Quick reply to this message Share with Facebook
  #4  
Old 07-05-2012
DrB DrB is offline
Senior Member
 
Join Date: Mar 2007
Location: New England
Posts: 966
Thanks: 0
Thanked 7 Times in 7 Posts
Rep Power: 8
DrB will become famous soon enough
"Warm" to the touch, Okay.......

"Hot" to the the touch, not okay.

If you put your hand on the nut/shaft after it has been running for few minutes and it is a little warm to the touch, you should be okay. Hot to the touch, as in you can't leave your hand on it or your brain response is "That is hot", then it's too hot. IR Thermometer is a good thing to actually measure the gland, start with the hand thing first to get an idea.

Bear in mind that ocean/lake/river water is cooling the gland and if the water is warm, the nut will be warm, not matter how well the shaft it being cooled. My mom and dad lived on the Cheasapeake and I remember in August, the water could be 83degF in so of the shallower areas. I lot different where I live, where the water doesn't get more tha n 70 deg F and more times than not <65 deg F.
__________________
If you liked my advice/response, give me some rep points. If you didn't......well what do you expect, it was free.
Reply With Quote Quick reply to this message Share with Facebook
  #5  
Old 07-05-2012
Member
 
Join Date: Jun 2011
Location: Northwest Ohio
Posts: 94
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 4
Ajay73 is on a distinguished road
Re: Stuffing box temperature

Quote:
Originally Posted by JimsCAL View Post
Very hot is not good. Slightly warm is OK. How fast is the dripp when running and when stopped?
Thanks for your reply. I'm not getting any dripping. This tech says that having a periodic drip is not really necessary. He's a guy in his late 50's and is very knowledgeable but I'm getting irritated on this point. He always comes back with "I've been doing this for forty years type answer". I asked how many threads were taken up with the packing nut and he said about three. I think I'm going to back the packing nut off about a half turn and see what happens. After running for 15 to 20 minutes the packing nut is too hot to touch. I've only run the engine two times for about 30 minutes each time but as I said the packing nut became too hot to touch.
Reply With Quote Quick reply to this message Share with Facebook
  #6  
Old 07-05-2012
DrB DrB is offline
Senior Member
 
Join Date: Mar 2007
Location: New England
Posts: 966
Thanks: 0
Thanked 7 Times in 7 Posts
Rep Power: 8
DrB will become famous soon enough
Drip, drip, drip, drip

If you have a traditional Stuff Box, you NEED it to drip when the shaft is turning. You NEED it to drip a few drips a minute. If you aren't dripping, you are not cooling the shaft.

You need to adjust/back off the packing nut until you just see drips when the shaft is turning. It's a finicky process, but you should be able to get it to drip a few (3-4) drips a minute and not drip when the shaft stops or only drip or two every few minutes when at rest. Drips at rest are better than no drips when spinning.

Also, the tech does not know what he is talking about if that is the answer that he gave you.

Drb
sawingknots likes this.
__________________
If you liked my advice/response, give me some rep points. If you didn't......well what do you expect, it was free.
Reply With Quote Quick reply to this message Share with Facebook
  #7  
Old 07-05-2012
sea_hunter's Avatar
Senior Cruiser
 
Join Date: Jul 2000
Posts: 512
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 15
sea_hunter is on a distinguished road
I agree, running hot, ie not able to hang onto the lock nut is too hot. When repacking the stuffin' box it shouldn't be dry for the first couple of hours till it seats. After a run in time reset the lock nut and tighten it down a bit more. After a couple of runs there should be "dampness" while tied up, a drip or two or three while underway. It's a sure sign of insecurity when your mechanic has to reinforce his abilities for age. I've been doing this over 50 years and I'm still learning. You might want to check out the cutlass bearing and all is straight based on previous adjustments. Good luck.
Reply With Quote Quick reply to this message Share with Facebook
  #8  
Old 07-05-2012
Senior Member
 
Join Date: Mar 2008
Posts: 886
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 7
GaryHLucas is on a distinguished road
Stuffing box temperature

I think a stuffing box should leak quite a lot at first and then be tightened slowly over a period of time. The looser it is with just an occasional drip the longer it will last, and the longer the shaft will last too. I used to repack hot oil pumps. The extra heat from a tight packing would set the pump on fire every time! You always stood fire watch after replacing a packing.

Gary H Lucas
Reply With Quote Quick reply to this message Share with Facebook
  #9  
Old 07-06-2012
JimsCAL's Avatar
Senior Member
 
Join Date: May 2007
Location: Glen Cove, NY
Posts: 2,497
Thanks: 2
Thanked 46 Times in 42 Posts
Rep Power: 8
JimsCAL is on a distinguished road
Re: Stuffing box temperature

Quote:
Originally Posted by Ajay73 View Post
Thanks for your reply. I'm not getting any dripping. This tech says that having a periodic drip is not really necessary. He's a guy in his late 50's and is very knowledgeable but I'm getting irritated on this point. He always comes back with "I've been doing this for forty years type answer". I asked how many threads were taken up with the packing nut and he said about three. I think I'm going to back the packing nut off about a half turn and see what happens. After running for 15 to 20 minutes the packing nut is too hot to touch. I've only run the engine two times for about 30 minutes each time but as I said the packing nut became too hot to touch.
Your tech is wrong. As has been noted, it has to drip when running to provide cooling and lubrication. The suggestion to start loose and gradually snug up on the packing is good advice. If you run this way you will score and damage the shaft. Either learn how to do this yourself or find a different mechanic.
sawingknots likes this.
Reply With Quote Quick reply to this message Share with Facebook
  #10  
Old 07-06-2012
Member
 
Join Date: Jun 2011
Location: Northwest Ohio
Posts: 94
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 4
Ajay73 is on a distinguished road
Re: Stuffing box temperature

Quote:
Originally Posted by JimsCAL View Post
Your tech is wrong. As has been noted, it has to drip when running to provide cooling and lubrication. The suggestion to start loose and gradually snug up on the packing is good advice. If you run this way you will score and damage the shaft. Either learn how to do this yourself or find a different mechanic.
I think the guy just doesn't want to admit he is wrong. He said if it gets hot it will just melt the wax in the packing. I'm going to back off the packing nut now I just have to decided if it is safe to do it with the boat in the water. I can have it lifted in the travel lift slings for $60. If I have it lifted I can back off the nut all the way and know how many threads are left on the nut. I hesitate backing it off all the way in the water as I don't want to have whatever pressure there is prevent me from getting the nut back on.
Reply With Quote Quick reply to this message 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:

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

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Temperature Classic30 General Discussion (sailing related) 40 08-15-2011 01:06 AM
Temperature gage Billy654 Gear & Maintenance 2 03-06-2011 06:35 PM
Exhaust Temperature oft Gear & Maintenance 1 07-31-2008 11:49 AM
Teak Oil and Temperature labatt Gear & Maintenance 4 02-03-2007 06:09 PM
Temperature Flucuation - Help rookie00 Gear & Maintenance 1 03-31-2003 07:16 AM


All times are GMT -4. The time now is 11:27 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.