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Thanks for all the suggestions and pointing me to various sources of information.
After doing more block and mallet banging with no success, I tried a different approach that I gleaned from more on-line research. I think it came from a Austin Healy site. I discovered the thread for the pressure gauge port is a standard 3/8" x 16 thread. I built an adapter that allowed me to go from a drilled out 3/8"x16 thread bolt (with head cut off) to a 1/4" FNPT pipe thread. The drilled out bolt went into the OD pressure gauge port with the copper washer as a seal, and the pipe thread connected to my portable hydraulic jack/ram set. Put 12 VDC on the solenoid to allow pressure to build from the hydraulic pump. A few stokes of the pump and the OD clutch popped free. Was then able to lift the OD off the M46 with no resistance. Besides getting the OD off, I confirmed the solenoid still works after all these years.
This in hind-site was so easy once I built the adapter in the machine shop at work. Took about 15 minutes and a piece of 3/4" scrap aluminum rod and a 1" bolt of 3/8"x16.
Will be using the trick next time I have to pull an OD off a tranny.
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Gary D
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