Engine block soft plugs. - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > General Technical Discussions > Engines & Drivetrain > Engine block soft plugs.

Stainless Steel Door Hinge PinsPoly Door Hinge BushingsSave at JeepHut on Smittybilt Soft tops

Reply
Unread 01-25-2005, 12:11 PM   #1
junior72
Registered User
 
Join Date: Dec 2003
Location: Los Angeles, SoCal
Posts: 1
Engine block soft plugs.

I own an 84' Jeep JC7 w/ an in-line 6 cylinder that has about 500 miles on it after a rebuild. Everything under the hood is also brand new. The Jeep overheated after only a ten minute drive and had shown no previous signs of running hotter. When I checked it, I saw that it was missing one of the soft plugs on the driver's side of the engine bolck and spilling coolant through it. What are these for? What causes these to pop out? Is this repairable or does the engine block need to be replaced? HELP???

junior72 is offline   Reply With Quote
Unread 01-25-2005, 10:45 PM   #2
jeepdaddy2000
Web Wheeler
 
jeepdaddy2000's Avatar
1971 CJ5 
 
Join Date: Jan 2002
Location: Eagle Point Oregon
Posts: 6,166
It's where they drain the sand after casting. It probably wasn't installed properly. Unless you ruined something overheating it, you should be able to simply replace it.
jeepdaddy2000 is offline   Reply With Quote
Unread 01-26-2005, 05:47 AM   #3
BamaJeeper
Registered User
 
Join Date: Jan 2003
Location: Alabama
Posts: 1,468
Return it to the rebuilder and have them fix it. That way they will know about it when they rebuild the next guys motor and hopefully make you happy by making things right.
__________________
Out of the darkness comes light.
BamaJeeper is offline   Reply With Quote
Unread 01-26-2005, 05:48 AM   #4
BamaJeeper
Registered User
 
Join Date: Jan 2003
Location: Alabama
Posts: 1,468
Oh yeah. If the coolant system happens to build enough pressure the plugs can pop out.
__________________
Out of the darkness comes light.
BamaJeeper is offline   Reply With Quote
Unread 01-26-2005, 03:15 PM   #5
AudioGuru
Registered User
 
Join Date: Apr 2003
Location: || <--This close to being banned.
Posts: 783
They're dual purpose, they allow access to the interior passages of the block during the casting process and they also protect the block from cracking if the coolant were to freeze. Sometimes they're referred to as "frost plugs" for this reason. In rarer cases they'll pop out during overheating, but usually the hoses will let go first.
__________________
[URL=http://www.villagephotos.com/pubbrowse.asp?selected=826692][B]Electric Hardtop Hoist[/B][/URL]
[URL=http://www.clifford.com/matrix/responder/default.asp][B]Clifford Matrix[/B][/URL]

[COLOR=White]Don't lie. God said so.[/COLOR]
AudioGuru is offline   Reply With Quote
Unread 01-26-2005, 08:17 PM   #6
mrgeoff
Registered User
 
Join Date: Jan 2005
Location: Fresno area
Posts: 105
"frost plugs"
how about freeze plugs.
I got you covered
mrgeoff is offline   Reply With Quote
Unread 01-30-2005, 09:24 PM   #7
Dembones
Registered User
1994 YJ Wrangler 
 
Join Date: Jan 2003
Location: Twin Falls, Idaho
Posts: 689
Forget the plug, throw a block heater in that bad boy
__________________
Blue '94 Wrangler, 2.5L: Under monsterization
37" Claws/teralow/HPD44/Trussed HI9/5:38s/detroits/SOA, shackle reversal on rebuilt waggy and XJ springs.
Blue Jeep Club member 2
Much more info here
Dembones is offline   Reply With Quote
Reply
Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.