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        Wanted OS 61 SF head needed or other OS 61

#1 alexedit Mar 01, 2010 03:02 PM

OS 61 SF head needed or other OS 61
 
I have an OS 61SF (round head) and I need the head for it. The spark plug hole is stripped.
Or - does anyone have any ideas how to fix this head. I don't think that it will ever be like it was before so I rather buy the head from someone

#2 alexedit Mar 01, 2010 03:04 PM

Os sf

#3 Comet1 Mar 01, 2010 03:32 PM

Helicoil kits are available at Pep Boys , have to ask 1/4 x 32 is the size.

Or send to:
C.F.Lee Mfg.Co.
10112 Woodward Ave.
Sunland, CA 91040
(818)352-3766

#4 alexedit Mar 01, 2010 06:49 PM

thanks comet1, but I have a question...if you "re-thread" it...wont the hole be wider and the glow plug will not fit tight?

#5 Comet1 Mar 01, 2010 06:55 PM

Quote:

Originally Posted by alexedit (Post 14482102)
thanks comet1, but I have a question...if you "re-thread" it...wont the hole be wider and the glow plug will not fit tight?

Nope :D, it will have the same fit as original , have been using them for years on all types of stripped threaded holes ;);)

More info:
http://www.rcgroups.com/forums/showt...+thread+1+4+32

#6 Comet1 Mar 01, 2010 07:15 PM

About C. f. Lee:

http://www.craftsmanshipmuseum.com/Lee.htm

#7 softlanding Mar 01, 2010 07:16 PM

Os 61 sf head
 
2 Attachment(s)
I have a good head with excellent threads i will sell shipped to you for $12 in the usa

#8 Comet1 Mar 01, 2010 07:22 PM

Quote:

Originally Posted by softlanding (Post 14482356)
I have a good head with excellent threads i will sell shipped to you for $12 in the usa

Most excellent :D:D can't beat that deal:D

#9 alexedit Mar 01, 2010 09:24 PM

PM Sent -
Still wondering though about the re treating. Im going to try it and report back. I just think that re threating would eat more "meat" away from the engine so the glow plug would dance in the hole...I am not debating this...I have no doubt...I am just trying to understand it. :-D

#10 SRush99 Mar 01, 2010 10:24 PM

You would drill and tap the glowplug hole oversized. The helicoil is a threaded coil of thread "wire" that screws into the oversized threaded hole. Check out this link:

http://www.emhart.com/products/helic...iex/design.asp

#11 alexedit Mar 02, 2010 07:12 AM

Quote:

Originally Posted by SRush99 (Post 14484096)
You would drill and tap the glowplug hole oversized. The helicoil is a threaded coil of thread "wire" that screws into the oversized threaded hole. Check out this link:

http://www.emhart.com/products/helic...iex/design.asp

OOOKKKK see now that I understand because then I'd be adding material to the head. Cool thank you all so much

#12 Cougar429 Mar 02, 2010 08:56 AM

Personally I have no reservations using them where the bolt goes in and stays there, but a better solution to helicoil in a temp and vibration environment is what is called a "Timesert":

http://www.timesert.com/

We used them for years to repair stripped plugs, some the result of automakers posting their 100K before the first tuneup. Ever try and pull a plug in an aluminum head that long?

p.s. I've seen too many helicoil inserts come out with the plug, or worse, thread inwards with the new plug to fall into the cylinder.


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