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Old Mar 01, 2010, 04:02 PM
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Wanted

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
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Old Mar 01, 2010, 04:04 PM
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Os sf
Last edited by alexedit; Mar 01, 2010 at 04:12 PM.
Old Mar 01, 2010, 04:32 PM
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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
Old Mar 01, 2010, 07:49 PM
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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?
Old Mar 01, 2010, 07:55 PM
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Originally Posted by alexedit View Post
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 , it will have the same fit as original , have been using them for years on all types of stripped threaded holes

More info:
https://www.rcgroups.com/forums/show...+thread+1+4+32
Last edited by Comet1; Mar 01, 2010 at 08:01 PM. Reason: added info
Old Mar 01, 2010, 08:15 PM
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About C. f. Lee:

http://www.craftsmanshipmuseum.com/Lee.htm
Old Mar 01, 2010, 08:16 PM
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Os 61 sf head


I have a good head with excellent threads i will sell shipped to you for $12 in the usa
Old Mar 01, 2010, 08:22 PM
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Originally Posted by softlanding View Post
I have a good head with excellent threads i will sell shipped to you for $12 in the usa
Most excellent can't beat that deal
Old Mar 01, 2010, 10:24 PM
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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
Old Mar 01, 2010, 11:24 PM
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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
Old Mar 02, 2010, 08:12 AM
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Quote:
Originally Posted by SRush99 View Post
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
Old Mar 02, 2010, 09:56 AM
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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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