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TR2/3/3A Lucas DM2 distributor bushing

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J

jfcdo

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For a Lucas distributor (part number 40480E - DM2P4), I am replacing the bushing. This distributor is from a 1959 Triumph TR3.

To remove the old bushing, I need to remove the driving dog. So far, I am unable to remove the driving dog retaining pin. After applying penetrating oil, I have tried using a hammer with an appropriately sized pin punch and the retaining pin is not moving.

Have others had this problem? Any advice about how to tackle this problem? I don't want to damage anything. Should I consider drilling out this pin? I have a replacement pin so I do not need to preserve this retaining pin.

Any advice or direction that you can provide is appreciated. Thanks
 
You have to want it,they are set in pretty hard.Warm it up a little and come at it from the other end.
The ends can mushroom and make it tough going.
Mazda used the same dog and bushing on the 1.6L Mx5 for many years,This is why a Lucas dizzy will
go right onto a Miata motor.....
Mad dog
 
If it is a spring pin, then drilling is an option if you cannot catch the edge to drive it out. If not a spring pin, then it is a tapered pin, which MUST be driven in the correct direction. Any tapping in the wrong direction will just seat it deeper and set it tighter. 2 things that sometimes help is a bit of heat (nowhere near turning the steel red!), and also tapping on the gear while it sits on an anvil or other heavy object. Tap 90 degrees off from the pin. The shock tends to unset the pin, then return to tapping...in the correct direction.

A taper pin can be drilled. Use the smaller end to size the drill bit. It is best to have a tapered drill to clean the hole after drilling, but you can usually clear it out with a pick or other sharp tool.
 
A tapered pin - that I did not know. I just need to figure out which end is tapered. Using heat sounds like a good idea. I would rather try that before doing any drilling. The pin that I am trying to remove is not a spring pin. Thank you for this useful information. Now I can approach this differently.
 
First, thank you for the advice posted. I tried some heat and that did not help much. Both ends of the pin appeared "mushroomed", so I used a 1/8 inch drill and drilled down the center of both ends about 1/4 inch. Three taps with hammer on a pin punch and it was out. I think that drilling the ends helped to eliminate the mushrooming and allowed it to move free. Thanks again for the advice, as I expect the heat helped too.
 
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