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A-type overdrive / gearbox trouble shooting
- Thread starter tdskip
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TR3driver
Great Pumpkin - R.I.P
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I used a "bearing separator" from HF, similar to this one:
https://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=30305
The supplied rods weren't long enough as I recall, so I used some "coupling nuts" and bolts from the hardware store to extend them.
Or, if that won't work, one alternative is to cut the bearing apart with a Dremel & cutoff wheel. Bit tedious, and takes a steady hand, but guaranteed to work eventually. When you get to the inner race, don't cut quite all the way through, then stick a cold chisel in the groove and smack it with a BFH to break the race. It's not fatal if you do nick the shaft, but try not to.
https://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=30305
The supplied rods weren't long enough as I recall, so I used some "coupling nuts" and bolts from the hardware store to extend them.
Or, if that won't work, one alternative is to cut the bearing apart with a Dremel & cutoff wheel. Bit tedious, and takes a steady hand, but guaranteed to work eventually. When you get to the inner race, don't cut quite all the way through, then stick a cold chisel in the groove and smack it with a BFH to break the race. It's not fatal if you do nick the shaft, but try not to.
HerronScott
Darth Vader
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tdskip,
Any more updates on the overdrive? I think you had it almost totally stripped down so I was looking forward to reassembly! <grin>
Scott
Any more updates on the overdrive? I think you had it almost totally stripped down so I was looking forward to reassembly! <grin>
Scott
Hi Scott - thanks for checking in. I brought it as far as I thought I could and then called in some expert help. It's being rebuilt by Brad Orndorff - so far so good.
If I promise to document the reassembly of the O/D to the main gearbox and installation and installation into the car will you forgive me?
If I promise to document the reassembly of the O/D to the main gearbox and installation and installation into the car will you forgive me?
HerronScott
Darth Vader
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Heck of course! Just seeing a full teardown was great. I'd only made it as far as unbolting one from my broken TR3 transmission and bolting it on the TR4 transmission that I had rebuilt and installed an overdrive mainshaft.
Scott
Scott
sail
Darth Vader
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In my case it went smooth.
I put the od and box on my workbench with blocks to get everything parallel. Remember there are TWO splines in the back of the od, line them up first and then orient with mainshaft. There are two longer studs in the od which pull the two together. Instructions have you hold down the plunger in the od to make room for the cam on the mainshaft (which should have the lobe up). Mine slide right on. The only thing the od guy said when he shipped was don't force anything. The force on the studs did get progressivly greater as I tightened them due to the springs but it felt right. Easier than I expected.
I put the od and box on my workbench with blocks to get everything parallel. Remember there are TWO splines in the back of the od, line them up first and then orient with mainshaft. There are two longer studs in the od which pull the two together. Instructions have you hold down the plunger in the od to make room for the cam on the mainshaft (which should have the lobe up). Mine slide right on. The only thing the od guy said when he shipped was don't force anything. The force on the studs did get progressivly greater as I tightened them due to the springs but it felt right. Easier than I expected.
HerronScott
Darth Vader
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Ditto what Richard said regarding mounting the overdrive on the transmission.
No issues here for myself on reinstall into the car. Note that this was on my TR4A where I had originally installed a TR3 overdrive transmission when I restored it, but it failed in the first year (broken tooth related to first/reverse if I remember correctly).
Scott
No issues here for myself on reinstall into the car. Note that this was on my TR4A where I had originally installed a TR3 overdrive transmission when I restored it, but it failed in the first year (broken tooth related to first/reverse if I remember correctly).
Scott
HerronScott
Darth Vader
Offline
tdskip,
Did you get your rebuilt overdrive back? I'm curious what the cost was to rebuild it after you had done all the disassembly and what parts he replaced?
Just curious for future reference since I know that I'll need to deal with it for the second TR4A and also the one that I'll be installing in the TR3 (Just found I have a spare overdrive transmission that I have no idea where it came from. And here I've been watching overdrive transmissions on eBay. It's amazing what you forget you have after 20-25 years...)
Scott
Did you get your rebuilt overdrive back? I'm curious what the cost was to rebuild it after you had done all the disassembly and what parts he replaced?
Just curious for future reference since I know that I'll need to deal with it for the second TR4A and also the one that I'll be installing in the TR3 (Just found I have a spare overdrive transmission that I have no idea where it came from. And here I've been watching overdrive transmissions on eBay. It's amazing what you forget you have after 20-25 years...)
Scott