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Overdrive solenoid problem on a BJ8

shorn

Jedi Knight
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Recently I had to replace the overdrive solenoid on my 1964 BJ8. This was an aftermarket solenoid that had been in the car just a couple of years. The solenoid would not engage and actually would blow a fuse (added a fuse to this wiring a few years ago). The new Moss aftermarket solenoid seems to engage properly and the overdrive works. Just wondering if others have had this experience with the aftermarket solenoids. Perhaps I need to do some adjustment to see if it is fully engaging, but I believe that to be the case. Thoughts
 

Keoke

Great Pumpkin
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shorn

What size fuse did you add-??????
 

Brinkerhoff

Jedi Knight
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Its worth the time to study the shop manual to adjust the operating lever properly or risk burning out the solenoid if the plunger doesn't fully pull up on engagement.
 

RAC68

Darth Vader
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Hi Shorn,

I have experienced 2 issues in the past that have caused slow or no O/D activation. The first was when the button under the plunger flattened over time to cause the solenoid plunger to extend very near or past the coil's effective pull range and cause the O/D to "sometimes" activate. Since the old rubber button was still in place and under the plunger during the initial investigation, I overlooked its condition until totally removing the solenoid in preparation for solenoid replacement.

My second issue was as a result of using Red Line MTL fluid in the O/D. This is a very good manual transmission and overdrive synthetic fluid but also tends to leak through any possible orifice. Although I did replace the "O" ring that seals the O/D activation shaft passing through the O/D, it was obviously not sufficient to constrain the MTL fluid and it filled the solenoid housing (the BJ8 solenoid housing is a closed compartments) sufficiently to lock up the plunger. As it turned out, I may have overfilled the unit and the simple fix was to reduce the MTL fluid level within the transmission/overdrive to just below the shaft "O" seal and, as Brinkerhoff suggested, readjusted. All has worked perfectly for the past 10 years.

One last point. I had installed a 10 amp in-line fuse at that time to protect the car's original solenoid and have had no issues.

All the best,
Ray (64BJ8P1)
 
Last edited:
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