What's the big hole in the bell housing for on the driver's side? Basically, it's a mirror image of the timing hole on the passenger side but slightly larger.
Last edited by Otto Skorzeny; 10/10/20269:43 PM.
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)
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.
Ventilation for clutch cooling, most likely- - - - -although it might be possible to add a pointer to time the engine on a cylinder different than #1. Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!
It's used for the timing pointer south of the equator where the engines turn the opposite direction.
'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.
Do the GMC engines use the same Bellhousing? Could it be for timing marks on one of those?
~ Craig 1958 Viking 4400 "The Book of Thor" Read the story in the DITY 1960 Chevrolet C10 "A Family Heirloom" Follow the story in the DITY Gallery '59 Apache 31, 327 V8 (0.030 over), Muncie M20 4 Speed, GM 10 Bolt Rear... long term project (30 years and counting)
If you don't like driving yourTruck, you won't drive yourTruck..| Living life in the SLOW lane
Anyone know that there is a plug that is supposed to go in there? It is made of what appears to be rubber which would explain why they aren't found very often. Rubber does not last anywhere near 70 years. I have one. It is black and has a crown on the exposed surface. Its density is similar to a hockey puck.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
Do the GMC engines use the same Bellhousing? Could it be for timing marks on one of those?
GMC timing window is on the same (starter) side of the engine that Chevies are.
'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.
34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
Did you paint a mark on the flywheel or something, Wally? And why not use the other hole that already has a pointer on it?
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)
Anyone know that there is a plug that is supposed to go in there? It is made of what appears to be rubber which would explain why they aren't found very often. Rubber does not last anywhere near 70 years. I have one. It is black and has a crown on the exposed surface. Its density is similar to a hockey puck.
I thought there might have been a rubber plug that was supposed to be there. That's what prompted me to ask the question in the first place. I have a bunch of rubber plugs left over from the Little Red project. I used one on the shift column. Maybe one will fit the flywheel hole.
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)
34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
Oh, are you saying you tried to set your timing using that whole by mistake?
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)
34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
I just took a quick look at the spare bell housing I have. The hole in question is machined, and MAY be lined up with the pocket for the clutch throwout arm pivot ball (I didn't look that closely.) That would be how that pocket was machined in the bell housing. If someone REALLY wants to know, I could go inspect more closely. What prompted me to go look was the talk about a rubber plug for the hole. Why would GM machine a hole only to plug it up again?
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.
Again, that's why I ask all kinds of questions about innocuous things on these trucks , like the upside down coil. There are reasons for everything and I just like to know what they are.
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)
That's funny. I did the same thing when I first got the truck running and wondered why there wasn't a BB. Then I saw the other hole.
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)
I just took a quick look at the spare bell housing I have. The hole in question is machined, and MAY be lined up with the pocket for the clutch throwout arm pivot ball (I didn't look that closely.) That would be how that pocket was machined in the bell housing. If someone REALLY wants to know, I could go inspect more closely. What prompted me to go look was the talk about a rubber plug for the hole. Why would GM machine a hole only to plug it up again?
Maybe some type of inspection hole? Adjustment hole?
~ John in Utah 1946 1/2Ton w/4-speed manual transmission w/1960 235 engine Here We Go Follow in his DITY Bay
- If you think about it, it has been one year ago today!
John, your bell housing is a bit different than the AD ones, with those two "windows" near the top where it bolts to the block where the AD housing I have is solid.I see now that my assumption that the hole in question being lined up with the clutch arm ball (I was remembering it as a socket, but that's on the arm itself) is incorrect. So the mysterious hole is still mysterious. Nothing there to adjust, but maybe a spot for engaging the flywheel teeth to bar the engine over?
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.
