Possible Coolant Leak - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old Dec 11th, 10, 10:14 AM Thread Starter
Gold Lifetime Member
Join Date: Oct 1999
Location: Alamogordo, NM, USA
Posts: 1,034
Possible Coolant Leak

I was hoping I could get some opinions on an issue I have.

After breaking in and running a rebuilt Pontiac 400, I noticed that there was a little bit of water dripping out of the exhaust. I concluded it was condensation, although I was a little puzzled why there would be condensation from running an engine in a heated shop. I remember before I tore down the engine, it used to drip black sooty water.

To trace down a few other leaks at heater hoses, freeze plugs, etc, I pressurized the system to about 16 PSI. There were no external leaks, but the next day the pressure was completely done to zero. I am scared to death that there might be an internal leak like a head gasket, cracked block, etc. I have a few ideas to check for water leaks but haven't been able to try them yet.

The machine shop bored the cylinders and rebuilt the heads, (they pressure checked them, I'm not sure of the block.) They said the block didn't need decking.

My question is should the pressure remain in the system indefinitely?
69-er is offline  
Sponsored Links
post #2 of 3 (permalink) Old Dec 11th, 10, 10:46 AM
Super Moderator
Bess-68's rule
Everett#2390's Avatar
Join Date: Sep 2000
Location: Va Beach VA
Posts: 32,167
Re: Possible Coolant Leak

I believe there should not be condensation from the exhaust unless the overnight temp dropped below 60F, and then, a far chance.

Shops don't normally pressure test a block, but can be done.

Residual pressure overnight should have some left over the next morning. You might pressurize again and spray soapy water or Snoop, leak detector from a HVAC store, and test the shop connections for leakage and use the Snoop for other items - tank seams, etc.

The other method of test is to inject shop air into each TDC cylinder and look for bubbles in the rad coolant. Leaky head gasket or leak to the exhaust side. Generally, the cleanest spark plug, might even have a little green color on the porclein, is the suspect cylinder.

Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
CUBS - 2016 World Series Champions - Thank you, Joe Madden enjoy your next chapter.
Everett#2390 is offline  
post #3 of 3 (permalink) Old Dec 14th, 10, 06:02 AM
Senior Tech
Join Date: Apr 2007
Location: Austin, TX
Posts: 926
Re: Possible Coolant Leak

Coolant in the combustion chamber usuallys get burned and emits a white, sweet smelling smoke out the exhaust, not dripping water. Too much coolant in the cylinders will cause hydro-lock and possible engine damage like a bent connectiong rod.
Chuck is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

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


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

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