Leaky therm on A4 - SailNet Community
 
LinkBack Thread Tools
post #1 of 7 Old 01-14-2011 Thread Starter
Senior Member
 
SailingWebGuy's Avatar
 
Join Date: May 2010
Location: NJ
Posts: 233
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
 
Leaky therm on A4

I just started up my A4 after a minor rebuild. After running for about 20 seconds I noticed that the thermostat housing was leaking from around the gasket.

What would cause this???

A little background - I replaced all of the head studs except for 3 of them that wouldn't come out. One of those studs was for the therm housing. When I put the head back on, I didn't notice if that one particular stud was spinning when I tightened everything back up. Now, it does seem a bit taller than the others...but that could be my imagination.

My initial thoughts are that the stud was slowly pulling out when I tightened them up.

My complete refit is taking completely too long!
SailingWebGuy is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 7 Old 01-14-2011
Tartan 27' owner
 
CalebD's Avatar
 
Join Date: Jan 2008
Location: NYC
Posts: 4,793
Thanks: 5
Thanked 110 Times in 102 Posts
Rep Power: 8
 
Did you remove the T-stat housing from the head?
You might just need a new gasket for the T-stat.
Moyer recommends only putting gasket sealer on 1 side of the T-stat gasket. This way it is removable without always replacing the gasket.
It could also be the stud you mentioned. Perhaps that needs some gasket material.
Good luck.

"The cure for anything is salt water~ sweat, tears, or the sea." ~Isak Denesen

Everybody has one:

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
CalebD is offline  
Quote Quick Reply Share with Facebook
post #3 of 7 Old 01-14-2011 Thread Starter
Senior Member
 
SailingWebGuy's Avatar
 
Join Date: May 2010
Location: NJ
Posts: 233
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 6
 
I did remove it a put a new gasket back on...but no gasket sealer at all. This might be the problem.

Thanks!

My complete refit is taking completely too long!
SailingWebGuy is offline  
Quote Quick Reply Share with Facebook
post #4 of 7 Old 01-14-2011
Senior Member
 
Join Date: Jun 2007
Posts: 2,708
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
   
Quote:
Originally Posted by SailingWebGuy View Post
I did remove it a put a new gasket back on...but no gasket sealer at all. This might be the problem.
Yeah, a bit of gasket sealer, a thin layer, spread evenly, will be necessary. Wouldn't hurt to let it set up or cure a bit, before starting things up, too.

Jim
SEMIJim is offline  
Quote Quick Reply Share with Facebook
post #5 of 7 Old 01-14-2011
me at 67!
 
deniseO30's Avatar
 
Join Date: Nov 2006
Location: Bristol pa
Posts: 6,970
Thanks: 55
Thanked 126 Times in 115 Posts
Rep Power: 10
   
Pray you don't crack the hou$ing! eek!

Moyer Marine Atomic 4 Engine Rebuilding and Parts




Quite a few goodies he has just for that, take a look!

Denise, Bristol PA, Oday 30. On Tidal Delaware River, Anchor Yacht Club.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


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

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


My boat is sold!
deniseO30 is offline  
Quote Quick Reply Share with Facebook
post #6 of 7 Old 01-14-2011
1975 Newport 28
 
jaschrumpf's Avatar
 
Join Date: Jun 2002
Location: Monrovia, MD
Posts: 573
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 14
 
It would be better to check the status of that stud. Moyer recommends putting the sealer on one side -- the housing side -- so that one can take the thermostat housing off the head without tearing the gasket. Having sealant on only one side of the gasket isn't going to cause a leak unless there's another issue.

S/V Free Spirit

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

Monrovia, MD
jaschrumpf is offline  
Quote Quick Reply Share with Facebook
post #7 of 7 Old 01-14-2011
Tartan 27' owner
 
CalebD's Avatar
 
Join Date: Jan 2008
Location: NYC
Posts: 4,793
Thanks: 5
Thanked 110 Times in 102 Posts
Rep Power: 8
 
Make sure to remove the old gasket as completely as possible before putting the new one on.
Afourians tend to be a bit anal about different kinds of gasket sealers. Permatex or pemetex seems to be a favorite that comes in a few different flavors. I have successfully used the generic black gasket paste you will find at any auto parts store.
Like SemiJim suggests, the gasket paste needs a short amount of time to set before you try using your new seal.
Check and seal the stud by all means but if water is leaking out from the T-stat housing and the head there is most likely something wrong with your gasket (like no gasket paste).
This stuff is used on airplanes and cars: http://www.permatex.com/products/aut..._Sealant_a.htm

"The cure for anything is salt water~ sweat, tears, or the sea." ~Isak Denesen

Everybody has one:

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
CalebD 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
Leaky Bilge Allegro1 Gear & Maintenance 7 06-07-2010 01:45 PM
Leaky chainplates Yankee22 Gear & Maintenance 18 05-26-2010 08:03 AM
Leaky faucets ThirdCoastSailor Gear & Maintenance 11 04-26-2010 02:13 AM
Leaky Keel itsme6582 Gear & Maintenance 8 03-28-2010 10:06 AM
leaky windows jolly.mon Gear & Maintenance 2 12-01-2000 08:41 AM

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

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