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346 Flywheel

Started by pauldridge, July 31, 2012, 07:34:41 PM

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pauldridge

I'm currently in the process of overhauling a spare 346 V8 to replace the ailing one currently in my 1940 Sixty Special.  The spare engine came to me complete with flywheel, but from the bolt pattern on the flywheel, looks to me like it was drilled for the flexplate or torque converter of an automatic tranny (the engine is a 1949 vintage).  My car's a manual transmission.  Ideally I'd just as soon use the donor flywheel so I can go ahead and get it surfaced before pulling my current struggling-but-functional engine.

My guess is that the automatic and manual flywheel are not interchangeable, maybe even the starter setup is different?

Can anyone with experience on this enlighten me?

Sweltering in Austin
Phil
Phil Auldridge
Austin, TX
1940 60S as well as MGA, Stingray, '39 Ford Coupe, BMW 3.0 CS, '59 Jaguar, '51 Hudson Hornet, '64 and '70 Mercedes roadsters, and Nash-Healey LeMans Coupe
[img]http://www.auldridge.org/images/hdricon.jpg[/img]

markl

Phil,
Don't mean to sidetrack your inquiry, but if the flywheels are the same except for the drilling (I don't pretend to know), then it is a fairly straight forward process to have it drilled to accommodate to clutch pressure plate.  I only know this because I had to get a new flywheel for a Cummins Diesel that came w/o drillings (or in the wrong configuration, I can't remember) drilled to fit the pump on a piece of hydrostatic drive equipment.

Anyhow, the process was handled by Arms Pumps, Berkeley CA (www.armspumps.com) for a surprisingly reasonable cost.  I'm thinking it was only about $75, 6 years ago.  Of course the other piece of information you would need is the bolt circle dimensions, but hopefully, someone in the club can supply that.  Beings that you are in Austin, you may want to find someone local, so check out their (Arms Pumps) website to understand what their primary business is and maybe that will send you down the right path to find someone w/in driving distance.

On the other hand, if you don't mind paying the UPS both ways, Arms would be a slam dunk.  They are evidently a spinoff from the Jacuzzi Pump company (yeah, hydro tubs and jet drives) and routinely drill final drives to couple to their (and other) pumps.

Mark Lowery, CLC #25216

gary griffin

1949 vintage 346 engine????
Gary Griffin

1940 LaSalle 5029 4 door convertible sedan
1942 Cadillac 6719 restoration almost complete?
1957 Cadillac 60-special (Needs a little TLC)
2013 Cadillac XTS daily driver

Steve Passmore

Garys right Paul, 49 side valve engine??? cant be right, and if it is a side valve with an automatic flywheel I dont think you can use it, they are usually much thinner and no good for the stresses of a clutch housing.
Steve

Present
1937 60 convertible coupe
1941 62 convertible coupe
1941 62 coupe

Previous
1936 70 Sport coupe
1937 85 series V12 sedan
1938 60 coupe
1938 50 coupe
1939 60S
1940 62 coupe
1941 62 convertible coupe x2
1941 61 coupe
1941 61 sedan x2
1941 62 sedan x2
1947 62 sedan
1959 62 coupe

Roger Zimmermann

The part numbers are not the same for the flywheels used with Hydramatic or manual transmission.
1956 Sedan de Ville (sold)
1956 Eldorado Biarritz
1957 Eldorado Brougham (sold)
1972 Coupe de Ville
2011 DTS
CLCMRC benefactor #101

pauldridge

Quote from: S Passmore on August 01, 2012, 04:25:54 AM
Garys right Paul, 49 side valve engine??? cant be right, and if it is a side valve with an automatic flywheel I dont think you can use it, they are usually much thinner and no good for the stresses of a clutch housing.
Oops, my bad.. finger slipped, I guess... it's a 1947 engine.  You guys have confirmed my guess.  Not a big deal, I'll just use the flywheel off my current engine when it comes out. 

Thanks for the comments
Phil Auldridge
Austin, TX
1940 60S as well as MGA, Stingray, '39 Ford Coupe, BMW 3.0 CS, '59 Jaguar, '51 Hudson Hornet, '64 and '70 Mercedes roadsters, and Nash-Healey LeMans Coupe
[img]http://www.auldridge.org/images/hdricon.jpg[/img]

harry s

Phil, A very small percentage (less than 10%) of '47s had manual trans. Chances are your engine was a hydro. The hydros and manual flywheels don't interchange.  One other thing to check is the position of the dowell pins on the back of the block. The manual trans pins are in a different location. The block should be drilled for either  and the pins are a press fit. Good Luck, Harry
Harry Scott 4195
1941 6733
1948 6267X
2011 DTS Platinum

Jay Friedman

Also, on a 346 flathead engine the harmonic balancer on the front of the engine is different depending on whether the car is a manual or Hydra-matic transmission.  (I don't know why this is so and it is not true of '49 and later OHV motors.)
1949 Cadillac 6107 Club Coupe
1932 Ford V8 Phaeton (restored, not a rod).  Sold
Decatur, Georgia
CLC # 3210, since 1984
"If it won't work, get a bigger hammer."

Brad Ipsen CLC #737

Looking at the parts book the price of a 42 to 48 balancer/pulley is exactly the same as the 40-50,52 one which is just a pulley and hub.  There was no balancer.  The part numbers are different but the price is exactly the same and about 1/3 of the other version.  Probably Cadillac found that the fluid coupling can handle the torsional vibration.
Brad Ipsen
1940 Cadillac 60S
1938 Cadillac 9039
1940 Cadillac 6267
1940 LaSalle 5227
1949 Cadillac 6237X
1940 Cadillac 60S Limo