BeechTalk - BT - PA-28 yoke

Username Protected · **Posted:** 22 Jul 2025, 18:55

I'm replacing Bowtie yokes with Ramshorn on my PA-28-140 project. The shaft on one of the Ramshorns is badly pitted and so I'm swapping a good Bowtie shaft with the pitted one on the Ramshorn. I've managed to separate the Ramshorn from the shaft by drilling the retaining pin and using an ez-out. Question is, does anyone know the pn or correct name for this pin? It's 3/16" dia X 1 7/8" & after installation secured by staking.

Username Protected · **Posted:** 22 Jul 2025, 19:07

Not sure of the size but it is a standard split type roll pin. Can be carefully pressed in with a bench press or a drill press.

Username Protected · **Posted:** 22 Jul 2025, 22:32

Username Protected wrote:

Not sure of the size but it is a standard split type roll pin. Can be carefully pressed in with a bench press or a drill press.

I think a roll pin would have served this function just fine, unfortunatly it's a solid steel pin with a close tolerance fit and staked in place..

Username Protected · **Posted:** 22 Jul 2025, 22:35

I had a PA28 and a PA32 and changed the yokes on both of them. They both had roll pins and I put the same type back in

Username Protected · **Posted:** 23 Jul 2025, 01:20

The bowties had tapered pins in them, I do not recall what the ram's horn yokes had since I never had to take those off. It's been about 10 years since I last maintained a Piper.

Username Protected · **Posted:** 23 Jul 2025, 02:14

I remember an AD on the yoke taper pins, but I think that was the other end of the assembly at the universal joint. Make sure you know the issues on that end also

https://www.federalregister.gov/documen ... -airplanes

McFarlane had a little tool for the taper pins

https://www.mcfarlaneaviation.com/refer ... r-u-joint/

Username Protected · **Posted:** 23 Jul 2025, 08:42

Username Protected wrote:

The bowties had tapered pins in them, I do not recall what the ram's horn yokes had since I never had to take those off. It's been about 10 years since I last maintained a Piper.

The 1968 bowtie that I have here uses a clevis pin inserted from the bottom and an AN960 washer and cotter pin to secure it behind the center trim plate. It's sounding like Piper used a variety of methods to secure the yoke to the shaft.

Username Protected · **Posted:** 23 Jul 2025, 08:50

Username Protected wrote:

I remember an AD on the yoke taper pins, but I think that was the other end of the assembly at the universal joint. Make sure you know the issues on that end also

https://www.federalregister.gov/documen ... -airplanes

McFarlane had a little tool for the taper pins

https://www.mcfarlaneaviation.com/refer ... r-u-joint/

I'm familier with that AD, SWMBO owned a flight school with 8 Pipers in the fleet. The McFarlane pin removal tool was a blessing when it came out.

Username Protected · **Posted:** 24 Jul 2025, 11:47

What about using an AN bolt with a lock nut? If you have an AN bolt guide find one that is similar length and diameter to the pin. I would not want to pound a roll pin into a yoke it could damage it.

Username Protected · **Posted:** 24 Jul 2025, 13:35

Username Protected wrote:

What about using an AN bolt with a lock nut? If you have an AN bolt guide find one that is similar length and diameter to the pin. I would not want to pound a roll pin into a yoke it could damage it.

One would have to drill the top recess all the way through. It could then get counter sinked through.

Username Protected · **Posted:** 24 Jul 2025, 20:42

Username Protected wrote:

What about using an AN bolt with a lock nut? If you have an AN bolt guide find one that is similar length and diameter to the pin. I would not want to pound a roll pin into a yoke it could damage it.

One would have to drill the top recess all the way through. It could then get counter sinked through.

PA-28 yoke - shaft retaining pin.