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Author Topic: TECH! you asked, you git it.  (Read 3055 times)

xylene61

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TECH! you asked, you git it.
« on: May 26, 2009, 01:08:45 pm »

Restudding shovelhead rockerboxes:


Here is the stripped head in the milling machine. I taped up the spring & valve to minimize the chips going into the oil drains.
I put a dowel in the chuck to locate the original stud hole, and zero the readout.


Then I drill the tap drill hole to depth. I'm using "Keenserts", I don't recommend helicoils. so the tap is 9/16-12. drill for that size


Using the mill as a tap guide with a centre in it, I tap the hole to the bottom


Here you can see how the tap goes in, guided by the centre in the chuck


The finished hole. You can see the installation tool on the other stud hole


The finished job, with the keenserts installed to the correct depth, just under the surface of the head. Noe the tricky part is knocking those four little locking pins down into the head to prevent the insert from spinning. Make sure nothing sticks up proud of the head surface, or you'll still leak.
Don't forget to blow every chip out, even if you think none went in, the risk is still there. I blow & wash with brake cleaner, to get every chip still stuck in the oil out.


Here's the stuff i used: from L to R: Old stud, new stud, Keensert installation tool with keensert below it, and special tap(to me, anyway)
One tech tip: When using these keenserts, run a die down the new stud about halfway. The studs are made to lock into aluminum, and are REALLY tight when going into the keensert, as it's steel. A die will size the thread to help go into the steel, as it doesn't need as much interference when installed in the insert. Don't run the die all the way down the stud, or it will be loose.
« Last Edit: May 26, 2009, 01:27:00 pm by xylene61 »
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Keep a twist in your wrist, the rubber side down & the pinstriped side up

xylene61

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Re: TECH! you asked, you git it.
« Reply #1 on: May 28, 2009, 10:54:36 pm »

By the way, these head belong to a brother here, Named Randy. His shovel is really nice, too. I'll post pics of his '78 lowrider soon.
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rudog

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Re: TECH! you asked, you git it.
« Reply #2 on: May 29, 2009, 11:48:51 pm »

Very nice write-up. I even learned a new way to tap in a mill. Good stuff!
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Dave

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Re: TECH! you asked, you git it.
« Reply #3 on: June 19, 2009, 03:40:45 pm »

good job.. nice pictorial how too..
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LA_Dave

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Re: TECH! you asked, you git it.
« Reply #4 on: June 20, 2009, 11:13:37 am »

Great write up...

Quick question (I've never done keenserts before)

Do you use a hammer & punch to knock those locking tabs down or does that installation tool do it somehow?
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xylene61

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Re: TECH! you asked, you git it.
« Reply #5 on: June 21, 2009, 03:31:55 am »

I used a hammer & punch. The insertion tool has a pilot that is just sized to fit into the insert, with four slots cut into it to screw the insert down, leaving the pins sitting up. The pins mash through the thread in the soft material, locking the insert where it is. The pins get knocked down just under the surface if the head with a pin punch.

These inserts can be purchased by you Americans through McMaster-Carr online. They WERE a fantastic company, however, they have suspended selling products directly to us Canadians, in case we try to take over the world with them..... GRRRRRR
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LA_Dave

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Re: TECH! you asked, you git it.
« Reply #6 on: June 21, 2009, 11:36:44 am »

I've heard good stuff about 'em. Just never knew how they were installed. Great write-up, the pictures really helped me understand just how simple they are...

Thanks!
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Dave

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Re: TECH! you asked, you git it.
« Reply #7 on: June 22, 2009, 09:37:38 am »

i used some inserts that locked by flaring somehow when installed.. they were really good too ..
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Puzzled

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Re: TECH! you asked, you git it.
« Reply #8 on: August 25, 2009, 01:21:06 am »

That's pretty cool. I've never heard of a "Keensert" before.

Do the tabs overlap the threads when knocked down? (do they get taped in toward the hole or toward the outside of the hole?)
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Dave

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Re: TECH! you asked, you git it.
« Reply #9 on: September 26, 2009, 01:56:39 pm »

they have come up with some pretty neat thread repair gigs in the last few years or so.. many i prefer to a heli-coil ..
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