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Coolant leak from header bolts #350803 06/18/09 08:49 AM 06/18/09 08:49 AM
Joined: Feb 2007 Posts: 33 Illinois S saukvillage OP member
saukvillage OP member S Joined: Feb 2007 Posts: 33 Illinois	Started new 440ci motor for the first time and after after running to about 200 degree I cut the motor off. Started checking for leaks and I notice coolant coming out the header bolt near the fire wall. So, what can be done to fix this problem, Thanks.

Re: Coolant leak from header bolts [Re: saukvillage] #350804 06/18/09 08:55 AM 06/18/09 08:55 AM
Joined: Apr 2007 Posts: 2,826 NY usa 5 540challenger master
540challenger master 5 Joined: Apr 2007 Posts: 2,826 NY usa	Quote: Started new 440ci motor for the first time and after after running to about 200 degree I cut the motor off. Started checking for leaks and I notice coolant coming out the header bolt near the fire wall. So, what can be done to fix this problem, Thanks. Some guys like to use studs but in many cases when using headers that is not an option. You need to put sealant on the header bolts. Some guys use silcone, pipe sealant etc... Also make sure that you have the correct length bolt some header have an extra thick flange on them. You might want to drain the block to avoid making a mess.

Re: Coolant leak from header bolts [Re: saukvillage] #350805 06/18/09 08:57 AM 06/18/09 08:57 AM
Joined: Nov 2005 Posts: 15,119 85086 moparpollack Lil Herman
moparpollack Lil Herman Joined: Nov 2005 Posts: 15,119 85086	Did you use stainless steel bolts? Pull the studs and put sealant on them. I they aren't stainless they will rust shut. 56 Plaza 63 D100 step side 67 Coronet, 68 Roadrunner, 69 Super Bees, 69 Coronet 500 convertible, 70 Roadrunner Post, 79 D150 360, and a severe case of Mopar a,d,d

Re: Coolant leak from header bolts [Re: moparpollack] #350806 06/18/09 10:45 AM 06/18/09 10:45 AM
Joined: Jan 2003 Posts: 21,074 Niles , Ohio T therocks oh wait.but hey.lets see.oh yeah.
therocks oh wait.but hey.lets see.oh yeah. T Joined: Jan 2003 Posts: 21,074 Niles , Ohio	We use antisieze on them and no leaks.I went back to studs even though the aluminum heads are dry.We use studs wher ever they fit in all our heads.Rocky Chrysler Firepower

Re: Coolant leak from header bolts [Re: therocks] #350807 06/18/09 12:08 PM 06/18/09 12:08 PM
Joined: Apr 2009 Posts: 183 Canada M Mofopar member
Mofopar member M Joined: Apr 2009 Posts: 183 Canada	Only thing I'd add is to brush the threads clean and spray with brake cleaner before applying the silicone.

Re: Coolant leak from header bolts [Re: saukvillage] #350808 06/18/09 01:27 PM 06/18/09 01:27 PM
Joined: Jan 2007 Posts: 65 Saint Charles, MO P pleasantk member
pleasantk member P Joined: Jan 2007 Posts: 65 Saint Charles, MO	Had the same problem last fall on the back driver side. I have studs on mine and after talking to my builder, he recommended running a can of K&W through the cooling system. No leaks since and no issues with temp. Just make sure to follow instructions EXACTLY as written. Want to make sure coolant and K&W don't mix.

Re: Coolant leak from header bolts [Re: pleasantk] #350809 06/18/09 01:59 PM 06/18/09 01:59 PM
Joined: Jun 2009 Posts: 233 vashon island washington hunterstroble enthusiast
hunterstroble enthusiast Joined: Jun 2009 Posts: 233 vashon island washington	I huse loctite teflon pipe sealant, and Have used studs and bolts. Works great. Studs are better but sometimes you don't have the room. 1969 Dodge dart 500 stroker 1973 Dodge Challenger 440

Re: Coolant leak from header bolts [Re: hunterstroble] #350810 06/19/09 11:25 AM 06/19/09 11:25 AM
Joined: Jan 2003 Posts: 5,791 Hamilton, Ontario Canada Magnum master
Magnum master Joined: Jan 2003 Posts: 5,791 Hamilton, Ontario Canada	What's happening here is your are trying to seal a straight thread. That was NEVER meant to be done. Studs with a shoulder between the 2 threads or... Silicones is your best option here. Teflon tape, pipe paste, pipe thread sealant are for lubricating and sealing tapered threads. 69 Super Bee, 93 Mustang LX, 04 Allure Super

Re: Coolant leak from header bolts [Re: saukvillage] #350811 06/19/09 11:35 PM 06/19/09 11:35 PM
Joined: Feb 2003 Posts: 10,215 Someplace you aren't S SomeCarGuy I Live Here
SomeCarGuy I Live Here S Joined: Feb 2003 Posts: 10,215 Someplace you aren't	Gray high temp RTV, SS bolts I want my fair share

Re: Coolant leak from header bolts [Re: SomeCarGuy] #350812 06/19/09 11:41 PM 06/19/09 11:41 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	as said the shouldered stud is the best & can trim the outer(fine thread) end for clearance, only need enough threads for the nut to be flush live every 24 hour block of time like it's your last day on earth

Re: Coolant leak from header bolts [Re: RapidRobert] #350813 06/20/09 10:39 PM 06/20/09 10:39 PM
Joined: May 2005 Posts: 2,295 dark side of the moon D Dougsmopars top fuel
Dougsmopars top fuel D Joined: May 2005 Posts: 2,295 dark side of the moon	very common problem. Most header bolts break the wall into coolant channel. Wall is very thin in that area. I use a good high temp sealent when ever i install headers.It's nothing to worry about just a pain to do. Make sure you clean the coolant out of hole before you reinstall the bolts with sealent.

Re: Coolant leak from header bolts [Re: Dougsmopars] #350814 06/21/09 08:18 AM 06/21/09 08:18 AM
Joined: Feb 2003 Posts: 607 NY old340dog mopar
old340dog mopar Joined: Feb 2003 Posts: 607 NY	Will I experiance this problems with my 340 also?We just dropped motor back in yesterday and got headers bolted up. I haven't put any coolant in yet. I'm using Edlebrock RPM performer heads. So should I take the header bolts out at back of motor and put some sort of thread sealant in? Or do all of the header bolts? old340dog

Re: Coolant leak from header bolts [Re: old340dog] #350815 06/21/09 08:33 AM 06/21/09 08:33 AM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: So should I take the header bolts out at back of motor and put some sort of thread sealant in? Or do all of the header bolts? only the 4 corner bolts are wet on a SB & if the trimmed shouldered studs will work there I would use them(w sealant)& if not I would pump the rad up to 15 lbs of air & see if no leaks(that stant pump kit does come in handy at times) and pull the 4 corners & seal them. live every 24 hour block of time like it's your last day on earth

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