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Hi Art,
Thanks for the info on the OD circuitry. While I appreciate the ruggedness of the Volvo automobile more everytime that I drive one, I just can't believe that the Volvo engineers designed an OD to fail in the closed mode. While an across town drive with the OD oil circuit closed would not tax your engine, a couple of hundred mile freeway trip at 4,500 rpm would get on my nerves. I would like to modify a small Normally Open solenoid to replace the stock unit and let it bypass the OD on demand. It would probably take a remote mount of sorts, but I believe it can be done.
My background is industrial controls so I always look for ways to improve old relay devices. IDEC # RH2LB-UDC12V is a latching relay with heavy contacts rated for 10 Amps. The matching socket is SH3B-05. I have the wiring schematic that would allow the same momentary switch to latch it on and unlatch it. While I've not tested it out yet, I am going to install one in either my 940 or 760, whichever goes first. I'm also thinking of programming a small PLC to handle all of the relay functions on one of these cars and relocating everything in minature (OMRON) to the engine compartment.
When I was towing the first car with the 245 that I altered the OD solenoid on, the car (with the pedal on the firewall) would downshift from OD into third gear at 50mph. At 60 mph it would upshift back into OD. This was on the heavy pulls between Knoxville, Tennessee and Asheville, North Carolina. Going down hill I used the brakes to keep under 65 mph. These transmissions are a lot tougher than one would expect for the engine size. I've not rebuilt one yet, but am looking forward to it!
If you get to Charlotte on one of your trips, come on by.
Kindest Regards,
Will Dallas
www.willdallas.us
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