Re: Alternator adjustment bolt
Since John Pirkle has my alternator, this is from an April 63 car.
Since John Pirkle has my alternator, this is from an April 63 car.
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Re: Alternator adjustment bolt
Michael -- I'm having a hard time getting my mind around St.Louis, in 1965, using a split washer on the 396 upper alt brace bolt, yet an external toothed washer on the next small block down the engine dressing line (if one believes the AIM).
Here's a pic of what I believe to be the #138485 external 5/16" I.D. toothed washer, per P&A30 catalog, Gr 8.932 (see third line down). Seems to have the squared-off ends that has been mentioned by others.
I'm not saying that this bolt (WB headmark) or the flat washer is correct; just what I had on mine, but zero chance of being original to the car
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Also, I'm interested in hearing more about the flat washer that goes against the brace. # 3792420. In (small block) UPC 6 sht. A2, it's listed as "SPL Washer" (special ?), but in L78 section it shows as just "Washer", but with some hand written dimensions following, which I interpret [my copy not clear] as .054 (thickness ?) x .343 (the I.D. of hole ?) x .870 (the O.D. ?). This makes the flat washer I show definitely incorrect, as it's 0.087" x 0.343" x 0.75". So it seems too thick and too small in outer diameter. Others have said that the flat washer should be a THICK one
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Can anybody with a clearer '65 AIM read the hand notes after items 4, 5, and confirm my reading of item 6, on UPC L78, sheet A3 ?
Harry S. -- does your flat washer measure per above item 6 ?
Last edited by Wayne M.; November 6, 2008, 05:09 PM.Comment
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Re: Alternator adjustment bolt
I agree Wayne. I had the same thoughts when I first saw that the big block called for a different washer than small block. I assumed that the big block section of the AIM hadn't been updated completely when the new ext tooth washer was introduced in production for 65. Then I saw the same in the 66 and 67 AIM which makes me think it was intentional. I have no idea why though.Michael -- I'm having a hard time getting my mind around St.Louis, in 1965, using a split washer on the 396 upper alt brace bolt, yet an external toothed washer on the next small block down the engine dressing line (if one believes the AIM).
Here's a pic of what I believe to be the #138485 external 5/16" I.D. toothed washer, per P&A30 catalog, Gr 8.932 (see third line down). Seems to have the squared-off ends that has been mentioned by others.
I'm not saying that this bolt (WB headmark) or the flat washer is correct; just what I had on mine, but zero chance of being original to the car.
Also, I'm interested in hearing more about the flat washer that goes against the brace. # 3792420. In (small block) UPC 6 sht. A2, it's listed as "SPL Washer" (special ?), but in L78 section it shows as just "Washer", but with some hand written dimensions following, which I interpret [my copy not clear] as .054 (thickness ?) x .343 (the I.D. of hole ?) x .870 (the O.D. ?). This makes the flat washer I show definitely incorrect, as it's 0.087" x 0.343" x 0.75". So it seems too thick and too small in outer diameter. Others have said that the flat washer should be a THICK one.
Can anybody with a clearer '65 AIM read the hand notes after items 4, 5, and confirm my reading of item 6, on UPC L78, sheet A3 ?
Harry S. -- does your flat washer measure per above item 6 ?
It may be difficult learn the real story looking at Corvettes because so much has been tampered with on most of these cars. I bet pass car and light truck use the same washer though so maybe someone knows of an orig 65-67 out there somewhere?
Jorjorian sent a used original flat washer last month and the dimensions are almost exactly the same as those that you posted from the AIM.
ID, .340"... OD, .875'... Thick, .095".
Just removed/measured the washer from my basically unrestored 66.
ID, .335"... OD, .875"... Thick, .085".
By the way, the bolt in the 66 is the same WB that you have in your pic???????? I dunno.Last edited by Michael H.; November 6, 2008, 06:07 PM.Comment
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Re: Alternator adjustment bolt
Here ya go.
Washer, OD - .76 Hole D. - .30 Thickness - .06
L/W, OD - .51 Hole D. - .32 Thickness - .09
Like you, this is what is there.
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Re: Alternator adjustment bolt
Harry, What's with the blacked plating on the hardware.??? Should be zincad I believe. JDComment
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Re: Alternator adjustment bolt
John, may have been plated in 1963, but untouched since then best I can tell.
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Re: Alternator adjustment bolt
Looks like the toothed washer went on for longer than I thought -- or they found a box of the toothed washers back in the corner.
TerryComment
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Re: Alternator adjustment bolt
Michael,
My 67 AIM shows for the alternator adjustment bolt:
For the BB: 122017 bolt, 187119 L. Washer (looks like a split washer in the drawing) with a 3792420 Washer (flat washer)
For the SB: 122017 bolt, 138465 L. Washer (also looks split but a little fuzzy in my drawing) with a 3792420 washer (flat washer)Jerry Fuccillo
1967 327/300 Convertible since 1968Comment
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Re: Alternator adjustment bolt
Let me see if I have this correct. A 1967 Corvette is coming down the line, if it is a small block it gets a bolt, a star washer, and a thick washer for the top adjuster of the alternator. If it is a big block it gets the same bolt, a split washer and the same thick washer for the top adjuster of the alternator. Is this correct? If so I need a star washer, with my bolt and thick washer for my 1967 SB A/C Corvette with my John Pirkle 750 alternator. Thank you DaleComment
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Re: Alternator adjustment bolt
That was true of first shift.................except.............
for Monday mornings, Friday afternoons, mornings after payday, holidays, Christenings, Bar Mitzvahs, weddings, and especially, funerals.
Second shift, see note 5a, pp112-113, UAW Contract, and UAW Shift Preference Agreement.Last edited by Joe C.; November 8, 2008, 08:50 AM.Comment
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Re: Alternator adjustment bolt
Joe,
My thoughts exactly! A line worker says to himself, "Here comes a BB and I KNOW it gets a different washer on that alternator bolt," Then he goes out of his way to reach for the NCRS correct split washer cause he doesn't want to use that washer with the teeth on a BB.
Now over thirty 30 years later an NCRS judge is happy that UNION worker did the right thing!
Oh Please! That washer came out of the same box on the line until the box was empty and replaced with another box of who knows what!
JRComment
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Re: Alternator adjustment bolt
I doubt engineering would have changed the part number and part without a valid reason. For 63-64, we know the split washer was used and we know for 65-67 that it was replaced with an ext tooth washer, at least according to the 65-67 AIM's. (and a lot of original examples)
What we don't know is why 65-67 big block cars were supposed to get the split lock washer instead of the ext tooth washer.
The GM standatd parts book clearly describes both part numbers with drawings of each style.Comment
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Re: Alternator adjustment bolt
Wayne - Great photo of the alternator adjusting bolt & associated washers.
(FYI - They look like what I would expect)
Bit late on the follow-up but had to find the external tooth lock washer and the flat washer.
If I remember, the external tooth lock washer was what we called a "shakeproof" washer and the configuration of one used on 66 & 67 Corvette sb engines as far as I know and as shown in your photo is that it has the 9 squared off ears and is certainly not the "star" washer sold today. John Hinkley also mentioned that the same lock washer was used originally on the windshield washer squirters and it was also used on the side cover bolts on some transmissions.
The flat washer (p/n 3792420) was indeed called a "washer - special plain cad or zinc" in some instructions I had that came with a 1964 Small Block Air Conditioning Bracket Kit. I checked the dimensions of the (p/n 3792420) washers in the kit and they are as follows:
I.D. = 3/8" (0.375"); O.D. = 7/8" (0.875"); Thickness = 1/8 (0.125").
PeteComment
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