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Anyone tap a cylinder head?

Posted By: j3wbagell

Anyone tap a cylinder head? - 08/22/10 11:25 PM

the screw before the header is stripped and needs to tapped. It shoot out water when filling the radiator and gas when turned on, this was not happening before. IS that normal?

Plan on taking it to a shop to get tapped anyone done it themselves?
Posted By: SportF

Re: Anyone tap a cylinder head? - 08/22/10 11:43 PM

Well, you probably need to re-thread it with a heli-coil kit. If you have ever tapped something before it is pretty easy. If you haven't then you should have someone give you a little lesson on it. You could probably do it on the engine. Ask around, some of your car friends might already have a heli-coil kit. Good luck!
Posted By: 1969RR

Re: Anyone tap a cylinder head? - 08/22/10 11:57 PM

You say it shoots out gas??? That's not normal! The Exhaust studs go into the water jacket, so leaking coolant is normal, but I wouldn't think leaking gas is normal. Sounds like something else to me. Jeff
Posted By: j3wbagell

Re: Anyone tap a cylinder head? - 08/23/10 12:04 AM

it doesnt shoot gas like it shoots coolant. the gass is more of a spray but it definitely has persistence. it almost sounds like a rod is knocking with the header not completely attached.
Posted By: MoparforLife

Re: Anyone tap a cylinder head? - 08/23/10 12:47 AM

There is no way that there can be gas coming out of that bolt. Are you sure that it is stripped or do you just need sealer on that bolt? On a small block it is just the end bolt on each head that is wet. If it is a big block all of them are wet and should have sealer.
Posted By: 1969RR

Re: Anyone tap a cylinder head? - 08/23/10 12:51 AM


If you have gas comming out an exhaust stud, you got major problems. Crack in the cyl head might cause that. You'd better make sure that is gas, and if it actually is gas, plan on a tear down! Jeff
Posted By: j3wbagell

Re: Anyone tap a cylinder head? - 08/23/10 01:03 AM

I have a SB, luckily it is the end bolt. I took a bolt to HD and wound up getting a few at ace, they had better machined tips, but none of them would screw all the way in and had bent threads after taking it out.
Posted By: j3wbagell

Re: Anyone tap a cylinder head? - 08/23/10 03:11 AM

Anyone have a solution so i can drive the car to the shop? at least 15 miles
Posted By: GwaiiEagle

Re: Anyone tap a cylinder head? - 08/23/10 04:13 AM

use a bolt severely gooed with rtv sealant. like black or something. Even liquid teflon tape. Heavy goo,and bolt it on. Let it comeletely dry before you move the car.

Also if you a Helicoil, and it sound like you might have to, use the liquid teflon on the outside of the Heli-Coil so that has a good seal too.
Posted By: j3wbagell

Re: Anyone tap a cylinder head? - 08/23/10 04:21 AM

i should be taking it to a shop, i need to re rout the exhaust as well so hopefully i can get that done. After sealing the bolt how can i get the remaining seal out of the head? How high is the risk in doing that instead of towing it to a mechanic?
Posted By: mt162

Re: Anyone tap a cylinder head? - 08/23/10 02:54 PM

Quote:

it doesnt shoot gas like it shoots coolant. the gass is more of a spray but it definitely has persistence. it almost sounds like a rod is knocking with the header not completely attached.



I think he means exhaust leak - not a gas leak.
Posted By: gtx6970

Re: Anyone tap a cylinder head? - 08/23/10 02:56 PM

hire a rollback
Posted By: j3wbagell

Re: Anyone tap a cylinder head? - 08/23/10 06:27 PM

Quote:

Quote:

it doesnt shoot gas like it shoots coolant. the gass is more of a spray but it definitely has persistence. it almost sounds like a rod is knocking with the header not completely attached.



I think he means exhaust leak - not a gas leak.



gas is coming out the engine of the first hole. Is it safe to rtv seal in there?
Posted By: MoparforLife

Re: Anyone tap a cylinder head? - 08/23/10 06:34 PM

Quote:

Quote:

Quote:

it doesnt shoot gas like it shoots coolant. the gass is more of a spray but it definitely has persistence. it almost sounds like a rod is knocking with the header not completely attached.



I think he means exhaust leak - not a gas leak.



gas is coming out the engine of the first hole. Is it safe to rtv seal in there?


Gasoline (liquid) or exhaust.
Posted By: GwaiiEagle

Re: Anyone tap a cylinder head? - 08/23/10 06:48 PM

Quote:

the screw before the header is stripped and needs to tapped. It shoot out water when filling the radiator and gas when turned on, this was not happening before. IS that normal?

Plan on taking it to a shop to get tapped anyone done it themselves?



How about a photograph?

Gas as in petrol or gas as in steam from the rad?
Posted By: j3wbagell

Re: Anyone tap a cylinder head? - 08/23/10 10:33 PM

i don't know what to call it sorry i assume cylinder 5...

here you can see the empty hole


after ignition...


and a video just if you need
Posted By: MoparforLife

Re: Anyone tap a cylinder head? - 08/23/10 10:45 PM

to me it looks to be Right front cylinder and is number 2
Left side of engine (drivers side) 1-3-5-7
right side 2-4-6-8
Posted By: 70RR383

Re: Anyone tap a cylinder head? - 08/23/10 10:53 PM

Why do you say its gasoline and not antifreeze????Smell,taste,combustable???
Posted By: j3wbagell

Re: Anyone tap a cylinder head? - 08/23/10 10:59 PM

because there is no anti freeze the rad is clear, i just want to be able to get it to the mechanic and i cant drive with out any fluid in the radiator.
Posted By: GwaiiEagle

Re: Anyone tap a cylinder head? - 08/24/10 12:05 AM

You can do the tap with a heli-coil. Or get the shop to do it.

Getting it to the Shop?: Seriously goo the bolt and bolt it in as able. Let it dry overnight.

Yerself: I recommend a helicoil and liquid teflon on the outside of the helicoil when you screw it in.
Posted By: rhad

Re: Anyone tap a cylinder head? - 08/24/10 12:23 AM

you might try tapping it to 7/16,might be just enough to tap good!,DONT break off a tap in the head!
Posted By: scratchnfotraction

Re: Anyone tap a cylinder head? - 08/24/10 12:44 AM

remove the header before tapping the hole to 7/16 or helicoil

if you dont get it straight,and mess it up,the head will need to be replaced

to helicoil it you need the correct size drill bit with the helicoil kit

the kit has a tap and coils and the coil install tool

remove header,drill to size,tap hole,install helicoil with some rtv on the outside of the coil,put header back on and then use the stock size bolt with rtv on it..LET THE RTV CURE OVER NIGHT!...add water to rad and run engine and check for leaks

or like said,use a 7/16 tap and use a larger than stock bolt after drilling the header flange for the bigr bolt

Posted By: MoparforLife

Re: Anyone tap a cylinder head? - 08/24/10 02:05 AM

Quote:

remove the header before tapping the hole to 7/16 or helicoil

if you dont get it straight,and mess it up,the head will need to be replaced

to helicoil it you need the correct size drill bit with the helicoil kit

the kit has a tap and coils and the coil install tool

remove header,drill to size,tap hole,install helicoil with some rtv on the outside of the coil,put header back on and then use the stock size bolt with rtv on it..LET THE RTV CURE OVER NIGHT!...add water to rad and run engine and check for leaks

or like said,use a 7/16 tap and use a larger than stock bolt after drilling the header flange for the bigr bolt



Why are you guys talking 7/16? I suggest a 3/8. Jees the original is only a 5/16 so why would you recommend going to 7/16??
Posted By: scratchnfotraction

Re: Anyone tap a cylinder head? - 08/24/10 02:23 AM

my bad..I used what he said

i get the bolt size and the wrench head size mixed up a lot

your right 3/8 duz sound better
Posted By: rhad

Re: Anyone tap a cylinder head? - 08/24/10 03:24 AM

i also thought the original size was 3/8!!!
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