Cleaning up in the garage today and ran across these three parts in a small closed plastic tub.
The washers are 0.805" ID, 1.18" OD and about (I forgot to measure) 3/32" thick. There are wear marks on the flat surface of the washers starting at the hole and going about 1/2 way across.
The head of the screw is 0.57" diameter and 0.25" thick.
The threaded part of the screw is 0.43" long and has 3/8"-24 NF thread.
The "pin" on the end of the screw is 0.25" long and 1/8" diameter down to near the tip.
The parts had oil/dirt scum on them. Dirtier than if the were internal engine parts.
I have a partially assembled (and very clean) GMC 302, a bunch of parts pulled from a GMC 228 that was scrapped and my driver '52 GMC with 228.
Other than being in the same container, I have no reason to believe the washers have anything to do with the screw.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12 '52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
That screw looks like the one that holds the rear bushing carrier in place on a 3sp GM transmission.
~~ Jethro 1954 3100 Back to Life In the Dity Gallery 1951 3100 (gone) / 1956 4400 (still in the neighborhood) / 1957 6400 with dump body (retired) / 1959 3100 panel (in the woods junked) / 1978 Custom Deluxe K10 / 1993 S-10 4.3 / 2004 Chevy Crew Cab / 1945 John Deere H / 1952 John Deere B / 1966 John Deere 2510 / 1967 John Deere 1020
That screw looks like the one that holds the rear bushing carrier in place on a 3sp GM transmission.
That could be, but I believe that plug/screw on my tranny is bigger and a hex head. Yep, just checked. 11/16 hex head with .66 dia threads 18 pitch (maybe 3/8-18 National Pipe Straight?) The pin is about .28 dia.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
Good point. It looks a lot like the magnet drain plug on an outboard motor lower unit.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
I think we have a wiener! Even the thread count is the same.
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
So if that bolt is part of the GMC rocker assembly retainer, maybe the washers are the ones going at either end of the rocker shaft with the cotter pin that hold everything on the shaft???
Good info CrowbarBob!!!
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
