B s p

[Michael R.]

According to the Ford-Windsor parts manual, - - - - - (Canadian carrier parts bible ) - - - - - the 7/8 x 14 BSPP for the spindles is not the only BSPP thread used on the carrier.
The other (that I am aware of) is where one would expect to see it, on the oil cooler.

If this BSP discussion turns out to correctly be BSP, will I get a free lunch to replace the wager I lost over my opinion on the production technique used for the long shaft of the starter crank?
Is the major centre portion of the starter crank handle hollow or solid? 9/15: (edit:main shaft, not crank handle)
I came in second.

[Lynn Eades]

Michael, why should you doubt that it's BSP?
If your ever over my way, I'll buy you a pie

[Lynn Eades]

Michael, why should you doubt that it's BSP?
If your ever over my way, I'll buy you a pie

Crank handles:
I supect the early one piece ones were solid (smaller dia.)
The Canadian ones would be hollow. The splined bit is welded on. With the bigger dia., they would be very heavy other wise.

[motto (RIP)]

For some strange reason spark plugs have been standardised in metric, 10, 14, 18 and 22 mm that I'm aware of.
22 mm is close to 7/8" dia.
I believe that in earlier days some were BSP.

David

[Stew Robertson]

here is a quote from the machinist handbook
My question is why would you a loose fitting thread or a free fitting thread to fasten an axle in . yes you guys are talking the same threads but not machine cut threads where they are designed to hold a load for a to attach a wheel where they can be torqued to the right spec.
this is a IMG_00000274.jpg
PS I think you owe me lunch again

[Richard Farrant]

Originally Posted by Stew Robertson

here is a quote from the machinist handbook
My question is why would you a loose fitting thread or a free fitting thread to fasten an axle in . yes you guys are talking the same threads but not machine cut threads where they are designed to hold a load for a to attach a wheel where they can be torqued to the right spec.

PS I think you owe me lunch again

Your book is referring to American National Pipe threads, we are talking British Standard. Proof is shown in the original parts book that it is BSP. If a male and female thread are cut to the correct tolerances, there is no reason for them to be "loose fitting", that was referring to pipe nuts, this is a pipe thread form used elsewhere. In my work experience I have also come across BSP used in other roles, not pipe.

You might have to go hungry, no lunch yet

[Richard Farrant]

The real reason for using BSP for that diameter is TPI. Given the diameter, in BSW the nearest size would be about 7 tpi, in BSF it would around 9 tpi, so it makes sense to go to BSP and use a standard pipe diameter which give 14 tpi, much more sensible.

[Paul Dutton]

Originally Posted by Richard Farrant

The real reason for using BSP for that diameter is TPI. Given the diameter, in BSW the nearest size would be about 7 tpi, in BSF it would around 9 tpi, so it makes sense to go to BSP and use a standard pipe diameter which give 14 tpi, much more sensible.

And more grip!
I use BSP (no extra ' P' required) every day on hydraulic fittings! Anything up to 2" in normal use.
JCB, BENFORD/ THWAITS, etc, hell even some Japanese stuff like kobelco and Kubota use them.
Most European stuff is metric and Americans like Jic and Orfs (O Ring Faced Seal) and NPT which is close to bsp but differs on pitch slightly!
CAT use an inverted cone fitting like jic but with a bsp thread and komatsu the same but with a metric thread!!!
Confused??
Welcome to hydraulics, and don't even get started on the FINE and LIGHT threads!!!!