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1961 Hydromatic help

Started by dbzsjones, February 08, 2025, 03:49:22 PM

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dbzsjones

I've got a couple questions I'm hoping someone can help me with.  The question I should have asked before now.  Is there a torque spec for the nuts that hold the flex plate to the fluid coupling.  Next question, any advice on how to deal with a broken off stud?  I'm going to drag it to the local transmission shop Monday, but would like to be educated on what I might be getting into.

Big Fins

Can you access the broken stud with a drill and an EZ out? IIRC, they are 5/16" X 18. Drill a 3/16" hole in the center and see if you can work it out with an EZ out. You can even try a reverse twist drill bit.
Current:
1976 Eldorado Convertible in Crystal Blue Fire Mist with white interior and top. (Misty Blue)

Past and much missed:
1977 Brougham de Elegance
1976 Eldorado Convertible
1972 Fleetwood Brougham
1971 Sedan de Ville
1970 de Ville Convertible
1969 Fleetwood Brougham
1969 Sedan de Ville
1959 Sedan deVille

dbzsjones

I think they're a press fit.  I tried a few whacks with a punch but it didn't budge.

Roger Zimmermann

The torque value is in the shop manual. It's 15 to 20 Ft. Lbs. The stud is a press fit into the flywheel, with a serated shaft. Sometimes I have to replace one because the tread is stripped, but never saw a broken one. Of course, when I'm removing a damaged one, the flywheel is supported at the back, otherwise it's mission impossible. There is maybe a tool to extract such a bolt without removing the transmission from the car. 
1956 Sedan de Ville (sold)
1956 Eldorado Biarritz
1957 Eldorado Brougham (sold)
1972 Coupe de Ville
2011 DTS
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dbzsjones

I guess the good news is, I was still bolting up the trans to the engine when it happened so I put the engine back on the stand and the trans back on my dolly.  I did find replacement studs at Fatsco Transmission Parts, part number 8616889.  I also found a local shop that will do the work, and most importantly I found the torque spec table in the transmission section of the shop manual so I don't make that mistake again.