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So same OP some 13 months later, after 5 pages of suggestions back then...
Exhaust manifold hole
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BSB67
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Exactly.
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I don’t get it. Didn’t you have this same problem in Dec 2023?
Exhaust Manifold removal
I'm trying to remove my exhaust manifolds to send them out for ceramic coating. How do I remove the 2 bolts that are in the water jacket holes on the manifold? Is there a special tool or is it a 9/16" socket grinded down to fit in the opening? Many thanks
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Doesn't matter, just going over it again. The car will run and drive just how it is.
Plus his wife has heart surgery. Life happens!
Can't remember how I got mine out. Sorry
I kind of doubt it’s a 9/16” bolt head if the hole is .64” +/-. Looks more like a 1/2” head to me - possibly a header bolt as suggested. A 1/2” hex head is .577” +/- across opposing hex points.
I would soak it in penetrating oil and grind down a 1/2” socket to fit and see if it will engage the bolt. A Craftsman 1/4” drive 1/2” head socket is .067” dia. A 3/8” drive 1/2” head socket is .073” dia although I have an old Thorsen 3/8” deep socket that measures .070”. I suspect it’s a 1/2 hex-head - they had to get it down there somehow and tighten it.
I would soak it in penetrating oil and grind down a 1/2” socket to fit and see if it will engage the bolt. A Craftsman 1/4” drive 1/2” head socket is .067” dia. A 3/8” drive 1/2” head socket is .073” dia although I have an old Thorsen 3/8” deep socket that measures .070”. I suspect it’s a 1/2 hex-head - they had to get it down there somehow and tighten it.
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I still say it's a snapped off extended nut and my previous suggestions apply.
WileE
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Yeah, I don't see a hex nut in that hole, either.
Not saying you are incorrect Wayne but it would be a heck of a coincidence to have all 3 of them broken off down at the stud. I think it’s just rust and crud and a fuzzy picture concealing the flats of the head. Pretty sure it’s not a 9/16” hex head though. I could be wrong on the rest though.
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They could be some reduced head size MS nuts, but if that's the case a socket from a 1/4" socket set should get in there.
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I had 1 car that the owner b4 me used header bolts with a 3/8s or 7/16 head on them. A snap on 3/8s drive deep socket worked like a charm. Kim
That is kind of a mystery because most of the reduced head size, 3/8” bolts have a 3/8” or 7/16” hex head. A 1/2” hex head 3/8” bolt is pretty rare. Looks bigger than a 7/16 head in the hole but could be??
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The only 1/2 hex head on a 3/8s rod bolts that I’ve ever seen was on a 383 that was an old school build. I still have that motor. Kim
69_A12_6BBL
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Well.yeah there shouldn't be "Hex Nuts" in there, you mean DOWN INTO the Stud holes? Preventing you from removing the manifolds? If its what Im guessing, I'd get a METAL "Swzall Blade" and Cut the bolts...You can always use a torch and Vise-Grips after the manifolds are off & remove the Wrong bolts.
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The three deep holes that use the sleeved nut are shouldered so cutting them off gets you nowhere. The ones in question have been replaced with something other than factory, probably a bolt of some kind that's down in the hole.
I like the idea of a hole saw that will fit into the hole to remove the head of the bolt or a remaining sleeve if thats what it is. Problem is the engine will have to be lifted or removed to be able to do this. Maybe a 90* drill would work but it's really tight in this area. Good luck to the OP.
I like the idea of a hole saw that will fit into the hole to remove the head of the bolt or a remaining sleeve if thats what it is. Problem is the engine will have to be lifted or removed to be able to do this. Maybe a 90* drill would work but it's really tight in this area. Good luck to the OP.
69_A12_6BBL
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Can you show us a picture of the HEX nuts on Studs?
Dusty Dude
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My guess is that they are 3/8-16 12 point counterbore bolts.
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If I was to make a guess.... I'd guess the studs are gone, and it's either a 3/8 12 point bolt, or a 7/16 head six point. (Both header bolts, 7/16 more likely)
There are small sized nuts for 3/8 studs. Could be those too.
Time to start sticking 1/4 drive sockets in there to find what size the hex is.
( buy a dirt cheap garbage 1/4 drive socket set and grind the socket o.d. Find out what size the hex is, and go from there.......)
There are small sized nuts for 3/8 studs. Could be those too.
Time to start sticking 1/4 drive sockets in there to find what size the hex is.
( buy a dirt cheap garbage 1/4 drive socket set and grind the socket o.d. Find out what size the hex is, and go from there.......)
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