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Engine basics => Engine set up tips => Topic started by: RknRusty on August 14, 2015, 10:34:24 PM

Title: What's the thread size of the pressure tap nipples on OS mufflers?
Post by: RknRusty on August 14, 2015, 10:34:24 PM

I need to tap a tongue muffler to screw in a nipple taken from an OS-762 muffler. I expect they're all the same. Does anyone know what the thread size on those pressure nipples is? Hopefully the LHS will sell a tap that size.

The Tongue muffler is so thin I could just force it, but I'd prefer to thread it.
Rusty

Title: Re: What's the thread size of the pressure tap nipples on OS mufflers?
Post by: Tim Wescott on August 15, 2015, 12:26:59 AM

I think it's 3mm -- do you have calipers?

Title: Re: What's the thread size of the pressure tap nipples on OS mufflers?
Post by: RknRusty on August 15, 2015, 01:15:41 AM

Yes, SAE. I can do the conversion for the diameter. Still don't know the thread pitch. I'll see if a 3mm muffler bolt screws into the hole..

Title: Re: What's the thread size of the pressure tap nipples on OS mufflers?
Post by: Akihiro Danjo on August 15, 2015, 02:06:59 AM

I think it would be D 3.5mm and P 0.6mm.

Aki

Title: Re: What's the thread size of the pressure tap nipples on OS mufflers?
Post by: Tim Wescott on August 15, 2015, 09:57:45 AM

Now that I'm actually in the same building as my mufflers I measured one -- M3x0.6.

Title: Re: What's the thread size of the pressure tap nipples on OS mufflers?
Post by: RknRusty on August 15, 2015, 09:57:34 PM

Okay, thanks. Problem solved.
Rusty