08-04-2015, 12:13 PM | #21 | |
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Re: Banjo Bolts
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You are correct. They are Class IV. . |
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08-04-2015, 01:25 PM | #22 |
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Re: Banjo Bolts
Hmmm...now, what other extra-tight threads are there on early Fords? An earlier discussion that I can't seem to find on here showed specs for the head stud threads, with drawings from early and late production provided by uber-researchers Marco and Vince...those threads started as class threes, and were changed to fours later in production...unmolested threads with original studs gives leak-free installation with no goo and studs that stand up at 90 degrees so head can go right on.
I know for sure that I wallowed out a bunch of those holes with a standard machinist's taps years ago, before I learned the threads were not normal modern class 2's... Are there others around the car? |
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08-04-2015, 02:20 PM | #23 | |
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Re: Banjo Bolts
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. |
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08-04-2015, 02:26 PM | #24 |
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Re: Banjo Bolts
There's a lot of better threads on the Model A. The best way to clean the threads is to use a Dremel with a thin cutoff wheel and make 4 slits in a bolt, then use this bolt to clean threads.
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08-04-2015, 03:29 PM | #25 |
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Re: Banjo Bolts
Brent, I found the earlier discussion.
Marco's drawing calls out the tap size as "7/16-14 N.C. 4" and Vince's later dated drawing (now removed from the thread--?) says/said N.C. 5. I assumed those were the fit class designations, and the discussion by Marco and Vince seemed to indicate that they accepted the numbers as such. What remains of the discussion is here: http://www.fordbarn.com/forum/showth...eads&showall=1 I think yours shows a 5...or maybe a 3? Can't quite resolve it here. On all of this I am groping a bit...the info I have on 1930's thread designations is sketchy, and I have no experience in interpreting the Ford designations in the drawings. Your Banjo drawing is much more definite! Last edited by Bruce Lancaster; 08-04-2015 at 03:41 PM. |
08-04-2015, 03:52 PM | #26 |
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Re: Banjo Bolts
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Marco's copy is the same as mine with the exception mine is a 2/10/31 drawing and his the 3/29 drawing. |
08-04-2015, 04:11 PM | #27 |
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Re: Banjo Bolts
I found a copy of Vince's drawing showing the 5 designation, too...I had cut and pasted the discussion when all was still there.
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08-04-2015, 04:17 PM | #28 |
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Re: Banjo Bolts
If I remember correctly from my machining days. Class 5 is a interference fit.
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08-05-2015, 09:29 AM | #29 |
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Re: Banjo Bolts
I don't have enough information OR engineering education to sort it all out, but I suspect that we are looking at different classes in 1930's material and modern. WWII stirred up all sorts of change in fastener and thread standards, some of it involving unification of US and british threads. Also, then as now, I think a lot of standards encompassed mostly standard hardware, and critical fasteners in cars and especially in flying/space stuff were all either specced by manufacturer for their jobs or moved into a whole different world of standardss, like AN and NASA...
Ford fasteners would divide here between those with Ford part numbers like head studs and some brake bolts and those from the hardware bin, listed as standard hardware by Ford. |
08-05-2015, 11:09 AM | #30 |
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Re: Banjo Bolts
Thanks to all - but check back to post #15 and let me know if I should simply use silicon, or the Permatex suggested in post #16? If it still leaks after I replace the bolts I'll buy another bag of kitty litter and continue happily on my way.
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08-05-2015, 01:27 PM | #31 | |
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Re: Banjo Bolts
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Depends, ...check back to Post #21 to see what the likely issue is and how to properly correct it. I guess my point is, are you trying to correctly repair it, or just repair it good enough to use? |
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08-05-2015, 01:37 PM | #32 |
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Re: Banjo Bolts
your post #15 was answered in post #17
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08-06-2015, 10:27 AM | #33 |
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Re: Banjo Bolts
To clarify - the leaking differential is a problem I could live with indefinitely but, if simply replacing the bolts with a bit of sealer would alleviate the problem or solve it, all the better. Right now, it doesn't lose more than an ounce or so in 500 miles - well within my lubrication schedule.
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08-27-2015, 05:46 PM | #34 | |
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Re: Banjo Bolts
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Did you get the bolts from Snyders and install them? Did it help? Thanks Randy
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08-27-2015, 08:55 PM | #35 | |
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Re: Banjo Bolts
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08-28-2015, 07:11 AM | #36 | |
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Re: Banjo Bolts
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Actually, at least one supplier is selling bearing races that are not of the same dimension as original, --thus the reason why vendors sell brass shims to compensate. As for machining, you could do that but often times the housings only need .010"± of material removed to make it true. The bigger issue is the housings are generally tweaked (likely from towing/jerking/hitting something.) which creates not only leaks but causes the rear wheels to be out of alignment. Think about what happens when the rear wheel alignment is out with regard to the axles & differential parts. |
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