C2 battery access cover bolt size
Could not find anything in the archives. Simply put, what is the correct size/nomenclature for the eight bolts that hold the battery access cover for C2 A/C cars?
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1967 Coupe 427-390 w/air -
Re: C2 battery access cover bolt size
1/4-20 x 7/8" Indented hex point screws w/ "anchor" headmark with captured washer. These are the perimeter bolts and six are required.
The two lower bolts are different. "E" headmark 5/16-18 x 7/8" indented hex bolts w/captured washers.
Leif
'67 Coupe L79, M21, C60, N14, N40, J50, A31, U69, A01, QB1
Top Flight 2017 Lone Star Regional -
Re: C2 battery access cover bolt size
Leif:
Thank you for your explanation and pictures. This answers all my concerns. My 67 needed a new battery, and I decided to do this myself, instead of taking to a repair garage as I had been doing. I found that all eight bolts were 5/16-18 x 3/4 standard hex head, with a flat washer, and a nut. Have no idea when the original configuration got changed. Guess I'll just put back together the way I found it.
Thanks again for your clarification.
Jeff1967 Coupe 427-390 w/airComment
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Re: C2 battery access cover bolt size
Jeff and Leif,
I've done a lot of comparisons of both '66 and '67 AC cars when it comes to these screws. I've mainly been comparing my '66 AC L36 to my friend's car that's exactly 600 cars later than mine. I've also been checking on 2 '67 AC L36 cars as well. Those 2 owners are good buddies too and often share their original installed hardware info with me. Here's what I've found about these screws:
Bolt assembly #3797168 are indeed those "Anchor" head screws that Leif described here. Those are the (6) outer perimeter AC battery access door screws that screw into the riveted "T-Nuts" fixed to the door.
Bolt assembly #3797168 are also found attached to the lower portion of the hood prop at the fender skirt. There are (2) found there.
Bolt assembly #3797168 are also found screwed through the passenger side inner fender skirt holding the single "U-shaped" Freon hose clamp in place. Captive star washer nut assemblies hold these (2) screws to the clamp. The AIM shows these clamps held by a different bolt part number. But the ones I've found on '66 & '67 big block AC cars have the #3797168 screws installed. Not sure of AC small block car set-up with the two fender clamps.
Here's some '66 & '67 shots of the door compared to the clamp screws. With this info I've been able to scavenge other cars for complete sets of these screws. Mike
Ric's '66 L-36 Battery Door Cutting (4).jpgRic's L-36 AC Freon Hose Clamp & Screw (4).jpgJohn Richter's '67 Hose Clamp & Screws (1).jpgDavid H. '67 Freon Hose Clamp Screw & Nut (2).jpgDavid H. '67 Freon Hose Clamp Screw & Nut (3).jpgDavid H. '67 Freon Hose Clamp Screw & Nut (6).jpgDavid H. '67 Freon Hose Clamp Screw & Nut (7).jpgComment
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Re: C2 battery access cover bolt size
I think you will find the same anchor screw under the inside bottom windshield molding holding the fiberglass frame....if you want to steal some and use in a place the judges will see. I think if you buy repro anchor screws, the anchor is not made the same. Plus, the plating on those inside screws most likely will be like new.Avatar--My first ever vette, owned 3X since 1977, restored 1993-2024. Top Flight Award 9/14/24Comment
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Re: C2 battery access cover bolt size
Mike,
Not to be argumentative, but the AIM shows bolt #120706 and nut #271172 for the fender clamp bolts and nuts. They are a zinc or cadmium plated. (2) 1/4-20 x 1/2" hex head bolts with "RBW" headmark and (2) KEPS nut. This is what I have on my '67 L79 with factory A/C.
Leif
'67 Coupe L79, M21, C60, N14, N40, J50, A31, U69, A01, QB1
Top Flight 2017 Lone Star RegionalComment
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Re: C2 battery access cover bolt size
The battery pan bolts for the AC cars thread into the frame..... and the threads in the frame are easily stripped or enlarged from age, corrosion, difficulty in disassembly over the years, etc.
Some folks use a larger bolt, or a bolt and a nut, etc. The best way in my opinion is to use a "rivet nut" that installs directly into the frame hole and provides use of the correct bolts shown by Leif. These nuts are relatively cheap to buy, but generally use an expensive tool to install them. But I believe they can be also installed from a homemade tool as well. Or the tool can perhaps be borrowed.
LarryComment
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Re: C2 battery access cover bolt size
Hi Gary,
I knew there were other applications of these screws. I'd forgotten about the fiberglass dash upper screws. Man, if only we could still find junked C2s to pick over. Those dash screws sure would be the cleanest ones to hunt for!
I just checked my notes and AIM. I found one more application of screw #3797168. One of them is also used to hold down the center armrest cushion. So for you scroungers out there who need these screws check out:
-AC Battery Access Doors (6)
-Hood Props (2)
-Fiberglass Dash (9)
-Center Armrest (1)
-'66-'67 L36 AC Freon hose skirt clamp (2) ***although AIM lists a different part number these style screws may be found***
Hi Leif,
Yep, you're absolutely right about hex bolt #120706 being the correct bolt application for AIM C60 sheets D3, D3.5, & D6. When I bought my first Corvette, a '66 AC L36 long ago I quickly noticed that one of her previous owners "Bubba" had decided to change all engine bay fasteners to shiny hardware store stuff. So it's been a longtime labor of love to match up as close to original application all of her hardware as I possibly can. I've collected a handful of those 1/4-20 X 1/2" RBW grade 2 bolts with prior full intentions of using 2 of them on my single fender skirt clamp. Big block AC car heater hoses don't clamp to the skirt but are suspended above and over the compressor through a special clip aiming the hoses at the intake and water pump.
But while comparing my 3 other friend's original '66-'67 AC L36 Freon hose skirt clamp bolts we found that they were all these "Anchor" recessed hex head style screws there. Not a perfect science by any means but that's what we've found so far. And since my good friend's '66 AC L36 is just 600 cars built after mine and his has these "Anchor" screws on his skirt clamp, that's what I've chosen for mine. But if I find an original '66 big block AC car that's closer to my VIN with the flat hex head style "RBW" bolts then I'll use that style. I've got some real nice ones of those.
Check out my previous post again and look at the 2nd, 3rd, and 4th photos. They are all in order. '66 L36 clamp, '67 L36 clamp, and another '67 L36 clamp. Don't know why these style screws are showing up on these big block examples but they are.
Hi Jeff,
I didn't want to steer your thread in the wrong direction. Like Gary said, the repro "Anchor" screws often do look inferior. I've seen some that resemble an open umbrella. I absolutely avoid putting repro anything on my car. Hopefully you'll find some original examples and put together a nice set for your AC battery door.
I noticed by your profile that you own a '67 L36 AC car? Gotta ask you what have you found for your Freon hose skirt clamp screws? Are they the AIM referenced flat hex style that Leif mentioned or the "Anchor" recessed hex style that I've run across?
But maybe this subject is worthy of an entire new thread?
Cheers, MikeLast edited by Mike B.; December 31, 2021, 07:50 AM.Comment
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Re: C2 battery access cover bolt size
1963 3797168 Bolt 1 B33.00
800 Carpets & Covers 1963 3797168 Bolt 11 - 13 11.00
800 Hood, Lock, Support, Hinge & Cables 1963 3797168 Bolt C60 20.00
800 Air Conditioning - Filler, Windshield Washer Reservoir 1963 3797168 Screw 1 A23.00
800 Instrument Panel Body Frame 1964 3797168 Bolt
A9 1 Bolting & Welding 800 Instrument Panel Body Frame 1964 3797168 Bolt
C11 1 Assembly 800 Carpets & Covers 1964 3797168 Bolt
B7 11 - 13 800 Hood, Catch & Hinge 1964 3797168 Bolt
B2 C60 800 Air Conditioning - Skirt Filler & Windshield Reservoir 1965 3797168 Bolt
B6 11-13 19000 Hood Catch & Hinge 1965 3797168 Lower Outer Body Hinge Pillar Strip - R.H.
A7 1 Bolt Weld 19467 Lower Windshield Bonding Strips 1965 3797168 Bolt
F11 1 ASM 19000 Carpets, Insulation & Covers - Front 1965 3797168 Screw
B2 C60 19000 Air Conditioning - Skirt Filler & Windshield Washer Reservoir 1965 3797168 Bolt
A9 1 Bolt Weld 19000 Instrument Panel Body Frame 1966 3797168 Bolt
A9 1 Bolt Weld 19000 Instrument Panel Body Frame 1966 3797168 Bolt
F11 1 ASM 19000 Carpets, Insulation & Covers - Front 1966 3797168 Bolt
B6 11-13 19000 Hood, Catch & Hinge 1966 3797168 Screw
B3 C60 19000 Air Conditioning - Skirt Filler & Windshield Washer Reservoir 1967 3797168 Bolt Asm.
A-14 L 36
V-8 Engine 427 Hood Prop 1967 3797168 Bolt & Lock Washer Assembly
A-9 1 Bolt Weld 75-95 Lbs. in. Instrument Panel To Body Frame 1967 3797168 Bolt
F-12 1 ASM 75-95 lbs. in. Parking Brake Cover 1967 3797168 Bolt Asm.
B-6 11-13 75-95 lbs. in. Hood Hinge & Support 1967 3797168 Bolt Asm.
B-3 C 60 38-50 lbs. in. Air Conditioning - Skirt Filler & Windshield Washer Reservoir
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Re: C2 battery access cover bolt size
WOW, Harry!
Do you have some sort of MASTER AIM spreadsheet covering all midyears?
If so, anything you can share?thx,
MarkComment
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Re: C2 battery access cover bolt size
Yes, but I can't share it. I agreed not to share. Please contact Don for the C2 AIM.
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Re: C2 battery access cover bolt size
Ahhh, yes - OK
I assume you mean Don Olson...and I do have his for '67.thx,
MarkComment
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Re: C2 battery access cover bolt size
WOW Harry is RIGHT,
That spreadsheet is absolutely phenomenal. So this information is not sharable Harry? Somebody did a fantastic job on collecting this data and I'd gladly purchase a copy if it's available?
MikeComment
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Re: C2 battery access cover bolt size
Mike, go to post 11 and click on the link. Don Olson created the Access Database. You must agree not to share his Databases before he will send it to you. You need to contact Don to obtain his databases. Read through the posts in the link.
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Re: C2 battery access cover bolt size
Thanks Harry!
I sure will.
MikeComment
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