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Speedo Drive Pinion
- Thread starter DNK
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Tinster
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Don-
I recently replaced DPO Pedro's broken speedo cable.
Pretty straight forward. Unscrew one end from behind
the speedo; put the front end on jack stands and unscrew
the other end from the tranny under the car.
It was easy, even I could do it..... in less than a day!!
dale
I recently replaced DPO Pedro's broken speedo cable.
Pretty straight forward. Unscrew one end from behind
the speedo; put the front end on jack stands and unscrew
the other end from the tranny under the car.
It was easy, even I could do it..... in less than a day!!
dale
Don
I pulled out my old trans and took a look and checked the Bentleys. There is a bolt/pin that threads down to engage a groove on the speedo pinion. Pull that and the pinion is free to pull out.
Now there's the rub, it looks like there is an o-ring that will cause drag and also the fit of the pinion.
I see three choices, 2 prying devices to attempt to gently prise it out, being careful of the threads, find a nut that will thread on (difficult because of size perhaps and the fact that your threads may not be in top form) and you can pry against the nut. Or take off the tail shaft housing.
You might try wrapping the threads with several layers of duct tape and using a pliers. Ohh that is so savage.
I pulled out my old trans and took a look and checked the Bentleys. There is a bolt/pin that threads down to engage a groove on the speedo pinion. Pull that and the pinion is free to pull out.
Now there's the rub, it looks like there is an o-ring that will cause drag and also the fit of the pinion.
I see three choices, 2 prying devices to attempt to gently prise it out, being careful of the threads, find a nut that will thread on (difficult because of size perhaps and the fact that your threads may not be in top form) and you can pry against the nut. Or take off the tail shaft housing.
You might try wrapping the threads with several layers of duct tape and using a pliers. Ohh that is so savage.
TR3driver
Great Pumpkin - R.I.P
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It's important to remove the pinion BEFORE removing the tailshaft housing, as otherwise it's apt to break when it hits the part of the shaft with no teeth.
I found the "nut" from an old speedo cable (tach cable from a TR3 will work as well) and used that to protect the threads while prying with a pair of small pry bars. In addition to the O-ring & fit; mine seemed to be glued in by old, dried gear oil.
There are different configurations and I don't have them all straight, but ISTR those threads are brass on a TR3, so rather fragile. Here's Nelson doing it with one prybar.
I found the "nut" from an old speedo cable (tach cable from a TR3 will work as well) and used that to protect the threads while prying with a pair of small pry bars. In addition to the O-ring & fit; mine seemed to be glued in by old, dried gear oil.
There are different configurations and I don't have them all straight, but ISTR those threads are brass on a TR3, so rather fragile. Here's Nelson doing it with one prybar.
OP
DNK
Great Pumpkin
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Well I got it out cleaned it up and tried to clean the threads as much as possible (they are 3/4 26. Try to find that die). While it was out I screw the new cable on to it so I could get on good and tight. Is the hole in the gear suppose to be round to except the center of the cable. Boy, I hope so . Put a little lube on it jockeyed it into position and tightened it down. It better work.
