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09-24-2018, 04:47 PM | #1 |
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what is under the head studs?
I had to drill out a broken cylinder head stud, and some of the drilling swarf went down into the motor through the hole that used to be the stud. Does anybody know what is under this stud in a 21 stud motor? Is it accessible if I pull off the intake manifold? Or did the chips fall between the bores down toward the oil sump? I'd like to clean out the drilling chips, but I'm not sure if they are accessible. It is the top, center stud as shown in the photo.
Thanks, Pete |
09-24-2018, 04:55 PM | #2 |
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Re: what is under the head studs?
It is the water jacket, seal it when you replace the stud.
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09-24-2018, 05:07 PM | #3 |
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Re: what is under the head studs?
Yeah, just the water jacket. There's prolly so much crap, casting sand and whatnot in the water jacket already so a few extra metal chips, filings and more whatnot won't hurt a thing. Jack E/NJ
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09-24-2018, 05:13 PM | #4 |
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Re: what is under the head studs?
On an 8BA that hole goes into the center exhaust port.
You should be able to feel it thru the exhaust valve. The one below it is blind above the exhaust port. And any chips should come out the exhaust port.
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09-24-2018, 05:23 PM | #5 |
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Re: what is under the head studs?
Maybe if you drill thru the opposite wall of the exhaust port you will hit the water jacket.
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09-24-2018, 05:31 PM | #6 |
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Re: what is under the head studs?
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09-24-2018, 06:11 PM | #7 |
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Re: what is under the head studs?
On the 21 stud engine, doesn't that stud hole go into the center exhaust passage ?
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09-24-2018, 07:00 PM | #8 |
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Re: what is under the head studs?
Future reference, there are better ways to remove a broken stud if you can weld or get access to someone who can. Isn't that the hole that is used to secure the exhaust dividers when they are installed?
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09-24-2018, 07:02 PM | #9 |
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Re: what is under the head studs?
That's what it looks like to me, based on what some of the other guys said. The metal isn't rusty colored like it is in the water jackets. I'll see if I can verify that it is connected by opening one ex valve and shining a light through there. (As long as it isn't going to the sump or the cam followers, I'm pretty happy).
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09-24-2018, 09:48 PM | #10 |
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Re: what is under the head studs?
yeah, you'll blow any swarf outta the tailpipe upon firing up your old 21 stud!!
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09-27-2018, 02:45 PM | #11 |
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Re: what is under the head studs?
Hi guys. I can confirm that the stud hole goes into the exhaust port. Last night I poked a bit of safety wire under the valve head and saw it through the hole. The cylinder head goes back on tonight.
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