Distributor stop pin bushing dimensions

[coultl]

I feel like I just spotted a Snow Leopard in my garage, but here’s a few pics of what I think is the original plastic bushing on a FJ60 dizzy. I had a spare dizzy that looks like it was used for 10 minutes total. The bushing seems to be almost exactly 1/4” OD. The metal piece next to it is a #8 ID 1/4” OD bushing as shared in previous posts. The original bushing is not plastic but rubber. Stiffer than a vacuum hose but not by much. The softness means that the effective diameter is probably most like 5.5mm, but it’s hard to say for sure.

 

[coultl]

The plot thickens...

I pulled apart the dizzy that’s on the car and found about 1/3 of the plastic piece still in place. I measured this and found the wall thickness to be 1mm while a 1/4” replacement piece has a wall thickness of right about 1.5mm. Also, the piece I pulled off was hard plastic, no soft like the one on the new dizzy I pulled apart. Maybe someone had already replaced the plastic piece on the new dizzy with a piece of vacuum hose? I’m not sure.

For the dizzy on the truck, I just put a piece of silicone vacuum hose onto the pin and called it a day. It’s probably about 1mm too large in diameter and will reduce the ignition advance a small amount, but I think it’s close enough.

 

[4Cruisers]

The plot thickens...

I pulled apart the dizzy that’s on the car and found about 1/3 of the plastic piece still in place. I measured this and found the wall thickness to be 1mm while a 1/4” replacement piece has a wall thickness of right about 1.5mm. Also, the piece I pulled off was hard plastic, no soft like the one on the new dizzy I pulled apart. Maybe someone had already replaced the plastic piece on the new dizzy with a piece of vacuum hose? I’m not sure.

For the dizzy on the truck, I just put a piece of silicone vacuum hose onto the pin and called it a day. It’s probably about 1mm too large in diameter and will reduce the ignition advance a small amount, but I think it’s close enough.

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One-half the extra diameter, or 0.5 mm, represents a little less than 1.1 distributor degrees advance, so yes, not much.