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TR2/3/3A Here We Go!

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Marv...the drill is rated for 1200rpm. Most of my turning was at 1/2 that speed or less, as I was limited by the top cover not being on the tranny. Any faster and the oil would sling out. But, the drill had plenty of torque and speed to generate the accumulator pressure. Not obvious in the photo, 1/2" drills have a second adjustable handle. This second handle is off to the right, so it rests on the table top. It keeps the drill from turning, so you can operate the drill with just one hand, leaving the other free to play with the levers. I later put the cover on the tranny and used the drill to check the synchros in all gears. In the pic I only had the tranny in 4th, to make sure the countershaft was spinning to get lubrication. Otherwise it would be like towing a car with the drive shaft connected...only recommended for short distances.

Don...I like your set up! Definitely would save time in the long run. My big fear was that something would not work, and I'd have to take the entire tranny/OD assembly back apart. I have a gage just like yours...recommended by the Buckeye article! I now have to find a way to fashion an adapter plug to tap into the valve pressure to see what the pump is actually doing.

Walter...interesting! There has to be something to aligning the planets. Possibly just to make sure the manufacturing tolerances do not combine to bind the sun gear? If you're on the freeway cruising at about 3,000rpm, I figure those planet gears have to be churning about 10k rpm. The stress on them and the sun gear has to be pretty extreme.
 
Aloha John,

Your overdrive adventure is fascinating - definitely saved a tranny (& a TR2) from the grave. I vaguely remembered something about planet-gear punch marks from when I rebuilt a TR4 OD in the 80s'. I don't have the a TR4 manual here, but I looked in my Bentley TR6 manual and on Page 306 (40.20.10 step 82) it says "Rotate each of the planet gears until a spot, punched on the outside of each gear, is positioned radially outwards." It goes on about inserting the sun gear, and there is an illustration.

Maybe someone can look it up in a TR4 manual, or explain why (if?) this is important.

Keep up the good work!

Jeff
 
John-I have an extra adapter for the OD pressure gauge you can have for postage. I assume your gauge is threaded 1/4" NPT.
Berry
 
John,

I enjoyed reading about your adventures in recovering an overdrive from the brink. I too have one that was stored for many years after removal and from the looks of it was outside, but that will be a project for this coming fall!

This forum (all the people) make repairs seem less impossible and questions can be answered with just a post or picture!
 
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