PDA

View Full Version : stripped primary plug



skeezix
01-29-2007, 09:35 AM
Ok, so I have a stripped primary case drain plug. I figure a heli coil should fix it, only I have never used one ..... any tips ?


Skeezix

Bigshovel
01-29-2007, 09:39 AM
Make damn sure you drill the new hole straight. If it were me I would just drill to the next size up for NPT and re-tap.

skeezix
01-29-2007, 09:47 AM
So, forget the Heli coil and just retap for a larger plug ? Will I be able to find a plug that size? I really don't want to tear off the inner primary case to fix a stripped hole :(.


Thx, Skeezix

Bigshovel
01-29-2007, 10:09 AM
21/64ths drill bit and a 1/8th pipe tap. I can't remember how much meat is on the boss of that old outer primary, just make sure you won't be into the inner primary when you drill. A 1/8th plug is all you'll need after that. If you need assistance with getting that stuff....let me know. I'm pretty sure I have it on hand, if I don't then work does. :D

skeezix
01-30-2007, 09:46 AM
Thx bro, ill make a list and grab the stuff I need from the hardware store.

:)


Skeezix

Wide
01-30-2007, 10:01 AM
Skeez!!!

Just a howdy my man 1beer

See you at Speedmans :D

skeezix
01-30-2007, 10:06 AM
Wide you are wanting some fine Canadian apple cider ??? Gotta love the riding around "the County" huh ??

Yeah looks like this year is a "go" for speed's place.

Skeez

skeezix
01-31-2007, 09:55 AM
Here's an idear my old school car mechanic father-in-law gave me. He says to use a self tapping automobile oil pan plug. He says she will hold and no mess. Sounds like a band-aid to me but he has been around for sure.

what thinks ?

Also, Big Shovel, a 1/8 th tap sounds awful small for a drain plug hole, I am likely on not thinking correctly, but I just needed you to claify this for me....

thx bud, Skeezix

Wide
01-31-2007, 09:56 AM
Wide you are wanting some fine Canadian apple cider ??? Gotta love the riding around "the County" huh ??

Yeah looks like this year is a "go" for speed's place.

Skeez

Man I tell you I am addicted to Wapus winery :D

skeezix
01-31-2007, 10:02 AM
The riding in that area is some of the best in Ontario I think as well. Just a gorgeous place to visit, even if you can ride in Cali any other time :-)

Skeez

speedman
01-31-2007, 10:02 AM
We'll have lots of Wapoos high octane cider here for you. :)

SM

Kagan
01-31-2007, 10:14 AM
Don't let the 1/8" part fool ya. It has a small-taper diameter of .375" and a large-taper of .406". I have no idea how 1/8 (.125) was the designator for pipe plug dimensions. :wacko:

skeezix
01-31-2007, 10:20 AM
Thx for the clarification bro... So if I ask for a 1/8th pipe tap I will get what I need right ???

Skeez

Kagan
01-31-2007, 10:25 AM
I just found my chart. A drill size of 11/32" is required for a 1/8" pipe thread or 7/16" for a 1/4" pipe thread. A 1/4" pipe thread plug has a .54" outside diameter! Damn those pipe fitting bastards.

I spent 12 years in the aviation industry and I got to the point where I had a sample of each pipe thread size with their sizes marked on them to keep them straight. For example from the book:

Pipe size: 1/8
TPI 27
OD .405
WT .068
Eff Thread .264
Turns 1/4
Small taper .334
Drill 11/32

:blink2:

skeezix
01-31-2007, 10:32 AM
It just goes to show that pipe fiters really do not want us to know their secret world :D... A quarter inch is really a half inch bwahahahahaha

Skeez

Bigshovel
01-31-2007, 11:14 AM
The I.D. is the consideration for the size, The larger whole to be drilled is calculating the thickness of the pipe times 2 at the small end. This is so that after you tap (tapered) the plug (in this case) will get tight before it goes all the way though. I show a 21/64ths drill from my rigid pipe tap chart. Don't forget to use a sliver of teflon tape around the plug. :)

Kagan
01-31-2007, 11:32 AM
A 21/64" drill would be for those of us lucky enough to own the deluxe 386-piece bit set. :D