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Well I have one for you Curt.
The thread on the oil drain back pipe on the 100 engine (1B1236) has me
stumped.
The tube is 0.500" O.D. with an I.D. of 0.362"
The OD of the thread is 0.511" and it is 19 T.P.I.
I cannot find a 19 TPI x 1/2" pipe or tube spec anywhere .... any ideas?
M
On Wed, Dec 23, 2020 at 10:54 AM Curtis Arndt <cnaarndt@gmail.com> wrote:
> Here is an excerpt from one of my articles...
>
> On Tue, Dec 22, 2020 at 1:48 PM Curtis Arndt <cnaarndt@gmail.com> wrote:
>
>> The bolt is 5/16" BSW! Don't let anyone tell you different.
>>
>> Even my 45K original mile '60 Bugeye has its original 5/16" BSW bolt in
>> the generator front plate. The problem arises since a 5/16" UNC bolt ha=
s
>> the same tpi (threads per inch) as the 5/16" BSW bolt. The issue is tha=
t
>> UNC has a thread pitch angle of 60=C2=B0 and Whitworth by definition is =
55=C2=B0.
>> The wrong bolt will never torque properly and will eventually wear the
>> aluminum generator front plate.
>>
>> Cheers,
>>
>> Curt
>>
>> On Mon, Dec 21, 2020 at 3:53 PM Roger Grace <roggrace@telus.net> wrote:
>>
>>> My understanding is that they are close but not interchangeable ?
>>> Thread angles are slightly different.
>>>
>>> For AH generator adjusting link is this 5/16 W or 5/16 UNC ?
>>>
>>> At back of my mind think they should be Whitworth - think you told me
>>> that is why they come loose if you use UNC ?
>>>
>>> Finding it difficult to identify one from the other.
>>> Any tips to do this welcome.
>>> Have a definite W bolt and comparing to UNC can only see slight roundin=
g
>>> of UNC ?
>>>
>>> Moss sent me a UNC bolt for this link - well that is what they called i=
t
>>> ?
>>>
>>> Would appreciate your expert input.
>>>
>>> Regards,
>>> Roger Grace
>>>
>>>
>>> _______________________________________________
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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:comic sa=
ns ms,sans-serif;font-size:small">Well I have one for you Curt. <br></div><=
div class=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;f=
ont-size:small">The thread on the oil drain back pipe on the 100 engine (1B=
1236) has me stumped.</div><div class=3D"gmail_default" style=3D"font-famil=
y:comic sans ms,sans-serif;font-size:small">The tube is 0.500" O.D. wi=
th an I.D. of 0.362"<br></div><div class=3D"gmail_default" style=3D"fo=
nt-family:comic sans ms,sans-serif;font-size:small">The OD of the thread is=
0.511" and it is 19 T.P.I.</div><div class=3D"gmail_default" style=3D=
"font-family:comic sans ms,sans-serif;font-size:small">I cannot find a 19 T=
PI x 1/2" pipe or tube spec anywhere .... any ideas?</div><div class=
=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-size:=
small"><br></div><div class=3D"gmail_default" style=3D"font-family:comic sa=
ns ms,sans-serif;font-size:small">M<br></div><div class=3D"gmail_default" s=
tyle=3D"font-family:comic sans ms,sans-serif;font-size:small"><br></div></d=
iv><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On =
Wed, Dec 23, 2020 at 10:54 AM Curtis Arndt <<a href=3D"mailto:cnaarndt@g=
mail.com">cnaarndt@gmail.com</a>> wrote:<br></div><blockquote class=3D"g=
mail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204=
,204,204);padding-left:1ex"><div dir=3D"ltr">Here is an excerpt from one of=
my articles...</div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">On Tue, Dec 22, 2020 at 1:48 PM Curtis Arndt <<a href=3D=
"mailto:cnaarndt@gmail.com"; target=3D"_blank">cnaarndt@gmail.com</a>> wr=
ote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px=
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D=
"ltr">The bolt is 5/16" BSW!=C2=A0 =C2=A0Don't let anyone tell you=
different.=C2=A0=C2=A0<div><br></div><div>Even my 45K original mil<font fa=
ce=3D"arial, sans-serif">e '60 Bugeye </font>has its original=C2=A0 5/1=
6" BSW bolt in the generator front plate.=C2=A0 The problem arises sin=
ce a 5/16" UNC bolt has the same tpi (threads per inch) as the 5/16&qu=
ot; BSW bolt.=C2=A0 The issue is that UNC has a thread pitch angle of 60<sp=
an style=3D"font-family:"Segoe UI Symbol",sans-serif;font-size:12=
pt">=C2=B0</span>=C2=A0and Whitworth by definition is 55<span style=3D"font=
-family:"Segoe UI Symbol",sans-serif;font-size:12pt">=C2=B0.=C2=
=A0</span><font face=3D"arial, sans-serif"> The wrong bolt will never torqu=
e properly and will eventually wear the aluminum generator front plate.</fo=
nt></div><div><font face=3D"arial, sans-serif"><br></font></div><div><font =
face=3D"arial, sans-serif">Cheers,</font></div><div><font face=3D"arial, sa=
ns-serif"><br></font></div><div><font face=3D"arial, sans-serif">Curt</font=
></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail=
_attr">On Mon, Dec 21, 2020 at 3:53 PM Roger Grace <<a href=3D"mailto:ro=
ggrace@telus.net" target=3D"_blank">roggrace@telus.net</a>> wrote:<br></=
div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;bor=
der-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div=
>My understanding is that they are close but not interchangeable ?</div><di=
v>Thread angles are slightly different.</div><div><br></div><div>For AH gen=
erator adjusting link is this 5/16 W or 5/16 UNC ?</div><div><br></div><div=
>At back of my mind think they should be Whitworth -=C2=A0 think you told m=
e that is why they come loose if you use UNC ?<br></div><div><br></div><div=
>Finding it difficult to identify one from the other.</div><div>Any tips to=
do this welcome.<br></div><div>Have a definite W bolt and comparing to UNC=
can only see slight rounding of UNC ?<br></div><div><br></div><div>Moss se=
nt me a UNC bolt for this link - well that is what they called it ?</div><d=
iv><br></div><div>Would appreciate your expert input.</div><div><br></div><=
div>Regards,</div><div>Roger Grace<br></div><div><br></div><div><br></div><=
/div>
</blockquote></div>
</blockquote></div>
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