Exh Manifold stud: replace in place?
As it turns out, one of the exhaust manifold bolts on my 49 8 cyl was just sitting there, for looks only, because it was broken off. And another further back totally gone. So, the question is, should I fix it? It doesn't seem to be leaking but I sure don't want to blow the gaskets out. I'm tempted to drill and tap them out but if the hole goes to a water gallery is there an issue with getting metal fillings into the coolant? Does the first exhaust stud and the second from the back hit water?
0
Comments
-
As it happens I have sent Sam J. an article onthis very problem for the next W.T.N. It depends on whether the stud is broken off at the manifold or block level, whether you can remove it from the block. I'm unsure if the bottom of the hole goes through to the water jacket or into the intake chamber, but the small amount of filings involved won't matter that much either way. If it goes into the intake, you can blow air down the plug hole with the inlet valve open at that cylinder, and that will blow any rubbish back out the inlet manifold. If the stud has any length stil protruding, you may be able to get it out with vice-grips, but if you have to drill it out, then you can either drill it undersize and tap for a 5/16" stud and use a heavy washer, or carefully drill it out exactlyon centre and re-tap for 3/8" thread, or if that fails, use a heli-coil thread insert. Good luck,
Geoff.0 -
I drilled many out of a 8cyl 46 C8 with the engine in place. The one closest to the firewall was tough because I could not get a straight shot with the drill. I center punched each one and started with a small drill, the next drill was just smaller than the core of the bolt. At that point, the rest of the bolt just peeled out without a special extractor or re-tapping. The bolts were very soft metal. Just go slow and it should work out fine.
Also, in my case they were all broken at head level or just less.
Good luck,
Matt0 -
If the stud is still sticking out of the block, place a nut over it and mig weld it to the stud. Let it cool completely and it should come out. If the stud is flush with the block, place a washer over the stud and mig weld the washer to the stud, then weld a nut to the washer, let it cool completely and it should come out. Just my 2 cents but it works.0
-
Another trick is to use a reverse pitch drill bit (and run your drill in reverse, obviously)- if you've soaked the bolt with Kroil or PB Blaster, they'll often just unscrew when you apply the reverse drill.
BTW, I hang out on a tractor restoration board a lot, and everybody swears by Jimalberta's method of mig welding a nut onto the stud. Try unscrewing it before it has completely cooled, according to them.0 -
I had to do this recently on an intake manifold to remove a worn out carburator stud. I had to repeat the procedure several times but on the 4th time out it came. The third time the stud broke off flush with the manifold and I thought oh S@@t . Tried it one more time using a washer and welded the center of the washer to the stud then welded a good sized nut to the washer. This time I let it cool to cold and out it came.0
-
When you're welding, use lots of heat...the more the better.Get lots of penetration onto the stud.That was my problem, the first few tries was the weld would break off so the 4th time I really poured the heat to it.0
-
I have found it very helpful when drilling into an area that I didn't want shavings to fall,I put thick grease on the end of the drill bit before it goes thru. You might have to do this a few times but usually with good results. Left-hand drill bits are very helpful also,as mentioned. Snap-on makes a good set. 4 bits are about $45.00,but they work and you will tell yourself it was well worth the $$$$ when it comes out.0
This discussion has been closed.
Categories
- 37K All Categories
- 106 Hudson 1916 - 1929
- 19 Upcoming Events
- 91 Essex Super 6
- 28.6K HUDSON
- 561 "How To" - Skills, mechanical and other wise
- 993 Street Rods
- 150 American Motors
- 174 The Flathead Forum
- 49 Manuals, etc,.
- 78 Hudson 8
- 44 FORUM - Instructions and Tips on using the forum
- 2.8K CLASSIFIEDS
- 601 Vehicles
- 2.1K Parts & Pieces
- 77 Literature & Memorabilia
- Hudson 1916 - 1929 Yahoo Groups Archived Photos