Re: John's 1935 1201 Coupe for Two or Four Passengers, RHD in Tasmania
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Forum Ambassador
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Here are the pages for your 1201 coupe from the 1935 Eight sales brochure:
Posted on: 2017/6/23 7:33
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Re: John's 1935 1201 Coupe for Two or Four Passengers, RHD in Tasmania
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Just can't stay away
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Beautiful! Thanks for posting those, Dave.
John
Posted on: 2017/6/25 0:18
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Re: John's 1935 1201 Coupe for Two or Four Passengers, RHD in Tasmania
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Just can't stay away
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G'day all,
Back on deck after an extended leave of absence. Motivated to move forward with the restoration of the coupe. First priority is to get the water jacket ready for re-installation. I have 6 broken bolts on the water jacket; see picture attached. Wondering if anyone has experience with helicoil inserts for this application? I had a long and very productive phone conversation with Peter Toet in Canberra who advised this course of action. Do I just jump into the engine bay with a hand drill? Or is a greater degree of precision advised? What size helicoils are needed? Do people think I should do something entirely different? As always, thanks in advance for your advice. Cheers from Tassie, John
Posted on: 2018/5/9 19:32
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Re: John's 1935 1201 Coupe for Two or Four Passengers, RHD in Tasmania
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Forum Ambassador
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Sounds like you've already decided against trying to remove the broken bolts and preserve and re-use the existing threads?
Posted on: 2018/5/9 20:39
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Re: John's 1935 1201 Coupe for Two or Four Passengers, RHD in Tasmania
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Just can't stay away
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No, I'm open to all suggestions. I guess I wasn't confident that I would be able to get them out; do you think I should try an Easy Out tool?
Thanks, John
Posted on: 2018/5/9 22:22
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Re: John's 1935 1201 Coupe for Two or Four Passengers, RHD in Tasmania
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Home away from home
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Unless the threads are actually damaged, no need for helicoils. Once you get the broken bits out, you'll have a better idea if what will be needed in order to install fresh studs.
Posted on: 2018/5/10 0:10
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Re: John's 1935 1201 Coupe for Two or Four Passengers, RHD in Tasmania
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Home away from home
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John,
In order to drill out those broken studs you will need to centre punch each one exactly on centre and that is extremely difficult . In addition you will have your drill exactly square to the face, that is easy providing you make a simple drill jig. You can make the drill jig using a piece of say 1/2" round with a 1/4" or 3/8" thick flat welded about square to the end. Then fit the round in a lathe, face off the flat and drill the round to the diameter of the drill you intend using. This is then clamped to the face of the block to align the drill squate to the face. The drill will be smaller than the 1/4" diameter of those broken threads. You may need to drill increasingly larger drill sizes and you can enlarge the drill jig to suit as you go. If you have drilled on centre, with a bit of luck you will get the stud out. Don't try to get it out with one of those tapered left hand thread stud extractors or you may end up with a broken stud extractor which is a whole new problem. Before using this approach I would get a nut the size of the broken stud and weld it to the end of the stud, not easy with such small threads but it can be done. There is an excellent chance that the heat will loosen the broken stud and you will be able to unscrew it out with the nut. On one of my cars all of those threads were in such poor condition I heli-coiled the lot. .
Posted on: 2018/5/10 4:22
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Re: John's 1935 1201 Coupe for Two or Four Passengers, RHD in Tasmania
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Thanks Packard Don and David. You've given me plenty to think about. I really like the idea of the drilling jig. I've done some Googling and discovered there are some commercial ones available. They don't look very robust but I might get one and give it a try. Does anyone have an opinion on something like this?
http://biggatortools.blog/standard-v-drillguide-18-38/ Cheers from a saturated and stormy Tassie; any autumn leaves still on trees are flying off rapidly as we are getting hammered today. John
Posted on: 2018/5/10 19:13
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Re: John's 1935 1201 Coupe for Two or Four Passengers, RHD in Tasmania
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Home away from home
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John,
That drill jig looks fine as long as it takes the required drill sizes. If the drill is smaller than the hole in the jig it will not be held square. Also you need to find a way to clamp it against the face of the block. You can improvise clamps held by bolts into the adjoining threads. If you need to resort to Heli-coils you will need a drill jig to hold the tapping drill square.
Posted on: 2018/5/10 19:37
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