Fitting size for the small top hole intake elbow

[LiveFreeOrDieTryn2B]

Trying to find the size of the hole n threads on the small on top of the intake elbow. This fitting fits it .thanks guys

 

[jbayer]

Not near my Deuce right now, but I think it's 1/8" NPT.
Here's some pipe fitting info.


If "A" measures .405" it's 1/8" NPT, 27 TPI, hole drill size is 11/32" (.3438")
If "A" measures .540" it's 1/4" NPT, 18 TPI, hole drill size is 7/16" (.4375")
If "A" measures .675" it's 3/8" NPT, 18 TPI, hole drill size is 37/64" (.5781")
If "A" measures .840" it's 1/2" NPT, 14 TPI, hole drill size is 23/32" (.7188")

Of course it's best to use the correct tapered pipe reamer to ream the hole since pipe threads are tapered.

 

[LiveFreeOrDieTryn2B]

Its fine thread the fitting off the small hose from flame heater fits it.

 

[LiveFreeOrDieTryn2B]

The reason Im asking is the flame heater fittings are metric at least some of them from what i read. So just want to be certain.

 

[jbayer]

Ok, a pic might help.
If it's #24 in this figure, it's a standard NPT thread pipe plug.
TM 9-2320-361-24P, fig. 27

NSN is 4730-00-018-9566, which crosses to MS21336-2, which is a 1/8", 27 TPI pipe plug.
So, if not that than please post a pic. of the location of your plug.

 

[LiveFreeOrDieTryn2B]

Thank you so much it is #24 That was a huge help. I can now get things going with my project. I ll start a thread soon on it have a great day.