Heli-Coil Tranny?

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fatfatboy
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Heli-Coil Tranny?

#1

Post by fatfatboy » Sat Jan 09, 2010 12:57 am

While tearing my tranny apart so that I can get a crack welded I found one of the studs that mount to the plate has been epoxied at one time and the threads are toast.

i've used heli-coils before but not on a area that is stressed. Whats your guys thought on using a heli-coil on a tranny mount?
Or is it best to weld-fill the hole?
I am concerned that having the hole filled might create to much heat in one spot and cause some warping.

Thoughts?



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Re: Heli-Coil Tranny?

#2

Post by RUBONE » Sat Jan 09, 2010 1:17 am

Not sure what year tranny you are working on but H-D made oversize studs for just that problem. They are stepped to be larger on the tranny end but the portion going through the plate is as original. What are you working on?
Robbie

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Re: Heli-Coil Tranny?

#3

Post by FlatHeadSix » Sat Jan 09, 2010 2:03 am

My 31 VL tranny had one of those oversize studs in it, but it was loose, cocked over at about a 10 degrees angle, and it leaked. If it had been properly installed years ago it would still be in there. I put a HeliCoil in it and have not had any trouble, its strong, straight, and it doesn't leak. I installed the coil with plenty of red Loctite. The photo with the tap stuck in it also shows the oversized stud that was in it.

mike
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fatfatboy
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Re: Heli-Coil Tranny?

#4

Post by fatfatboy » Sat Jan 09, 2010 6:05 am

RUBONE wrote:Not sure what year tranny you are working on but H-D made oversize studs for just that problem. They are stepped to be larger on the tranny end but the portion going through the plate is as original. What are you working on?
Robbie
1960 Pan tranny.
The stud is the oversized type like the one in the pic that flatheadsix has lying on the case next to the tap in the 2nd pic.

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Re: Heli-Coil Tranny?

#5

Post by Cotten » Sat Jan 09, 2010 3:46 pm

FatFatBoy!

No matter which repair you choose,
Please seal over the studs on the inside of the case.

Glyptal works well.

....Cotten

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Re: Heli-Coil Tranny?

#6

Post by fatfatboy » Sat Jan 09, 2010 9:44 pm

Thanks for the tip Cotten. I did notice that my tranny was not lined.

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Re: Heli-Coil Tranny?

#7

Post by FlatHeadSix » Sat Jan 09, 2010 10:50 pm

Cotten,
I don't know if you have been following the WLA Bobber build that Matt & Carl Olsen are doing for Ryan on the AMCA forum but it is interesting stuff and well documented with some great photos.

A few days ago they coated the inside of the engine cases with some stuff I've never seen before, just wondering if you have any thoughts about what they used.

mike
Image

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Re: Heli-Coil Tranny?

#8

Post by mbskeam » Sun Jan 10, 2010 12:31 am


FlatHeadSix
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Re: Heli-Coil Tranny?

#9

Post by FlatHeadSix » Sun Jan 10, 2010 12:52 am

good link, thanks Mike

Says its good to 155C (311F) and has good oil resistence. Just wondering if anybody has tried it on an aluminum motorcycle case? (other than the Olsens)

I guess I could ask Carl or Matt how long they've been using it and what it looks like after its been run for a while.

mike

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Re: Heli-Coil Tranny?

#10

Post by steinauge » Mon Jan 11, 2010 2:58 pm

You can buy glyptol from Eastwood the auto restoration people.It works better than anything else I have tried.

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Re: Heli-Coil Tranny?

#11

Post by Cotten » Mon Jan 11, 2010 3:17 pm

Sorry I haven't been following the "giveaway" build,
(but I know the clutch hub was in good shape.)

I have encountered other coatings that have survived, so I am sure that Dolph's is probably as good as any of them.
My only cause to scratch my chin is that often the rattle-can variety of a coating is not as durable as the stuff bottled without a propellant.

Conditions within a tranny are far milder than in a motor, so a wide variety of goobers may serve well.
It would be prudent to test any motor coating with modern fuel, however, before committing to assembling the motor around it. Even glyptal is not completely resistant, thus focusing enormous importance upon a secure petcock on OHVs.

....Cotten

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Re: Heli-Coil Tranny?

#12

Post by ernietrucker » Fri Dec 31, 2010 1:37 pm

Cotten wrote: It would be prudent to test any motor coating with modern fuel, however, before committing to assembling the motor around it. Even glyptal is not completely resistant, thus focusing enormous importance upon a secure petcock on OHVs.

....Cotten
Any recommendations for a 'secure petcock'?

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Re: Heli-Coil Tranny?

#13

Post by ernietrucker » Fri Dec 31, 2010 1:41 pm

steinauge wrote:You can buy glyptol from Eastwood the auto restoration people.It works better than anything else I have tried.
Glyptal

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Re: Heli-Coil Tranny?

#14

Post by Cotten » Fri Dec 31, 2010 2:54 pm

ErnieTrucker!

Although the puristas would certainly point their stink-fingers in mocking distain,
and the speed-fiends would find it a mental flow restriction,
most sensible folk just put a hardware-store valve in the gasline.

I like MSC Industrial's compression-fit brass needle valves: MSC #: 03004934

....Cotten

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Re: Heli-Coil Tranny?

#15

Post by Frankenstein » Fri Dec 31, 2010 8:30 pm

I don't know about the cases, but looks like good stuff to spray down your 32E armature, you know, the one that still has cloth covered windings? I did that to save one that had an intermittent short years ago, and it's still running fine.
(we now return this thread to its regularly scheduled subject) :lol:
DD

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