Roll pin shearing

Guy's been running the same combo since 2009 and for all the sudden the roll pin in the dist sheared back in june. the only changes made was a carb swap to E85. Well fast forward to Sept. A week a go we tested and had a few stumbles on the last two runs. So Saturday first pas the car wouldn't stall and labored down track. Guess what another roll pin sheared? What do you think?

Ace

When you replaced the pin last time did you put the 1/8" back in it or did you go bigger?

Double pin it. I had one do it years ago in my motorhome.It only had 35,000 miles on it.I broke 3 of them before I double pinned it. I think it was probably getting wore where it had spun on the shaft. I put another below it a half turn away and never had another problem.

The process we use over at Bass Boat Bob's........move the o.d. of the pin up to 5/32" and then drive a smaller pin into the i.d. of the 5/32" pin.

Increase od, make sure gear is press fit.

New engine builder will only use the mutli-layer roll pins, In the past I've used hardened roll pins I got from a lawn mower shop.


G-

I broke a pin a couple of years ago for the first time. I bought a bag of the mult-layer pins and have been just replacing it at the beginning of every season.

Lem Evans wrote:The process we use over at Bass Boat Bob's........move the o.d. of the pin up to 5/32" and then drive a smaller pin into the i.d. of the 5/32" pin.

x3,never broke one.

This will fix it!

It sure will

Curt wrote:This will fix it!

that'd buy a lota roll pins Curt.

cool40 wrote:

that'd buy a lota roll pins Curt.

You've got a valid point there! Bob and Lem >>>>>

Wait a minute there big boy.......Lem didn't recieve any $s for that pump.

Tru dat Lem, but you did get funding from a lot that the pump protects also shown in picture.

Sure is alot of purty colors and fancy chit on there Curt!! Makes a Hillbilly feel all fuzzy and stuff I like the double roll pin you mentioned there Lem

no broken pin worries here either...............external pump for the win..........

Curt wrote:Tru dat Lem, but you did get funding from a lot that the pump protects also shown in picture.

Correct.....I was able to retire due to the revenue of other items

richter69 wrote:no broken pin worries here either...............external pump for the win..........

Do not use green oil on the shaft during the gear install......it's so slick that no pin[s] will be able to retain the gear.

Lem Evans wrote:
Correct.....I was able to retire due to the revenue of other items

Thats all I was trying to say!

Also check the distance from the bottom of the dist to the gear. If it is too long the gear will rub the block and shear the pin.

http://www.msdignition.com/instructions/Products/Tech_Info/gear_install_frm28590.pdf?terms=distributor+gear

Also make sure you are using a hardened pin. Most of the Silver pins at the hardware store are very soft.

Lem Evans wrote:When you replaced the pin last time did you put the 1/8" back in it or did you go bigger?

I put the 1/8" back in. And it was not a double rolled pin.

Ace

56Tbird wrote:Double pin it. I had one do it years ago in my motorhome.It only had 35,000 miles on it.I broke 3 of them before I double pinned it. I think it was probably getting wore where it had spun on the shaft. I put another below it a half turn away and never had another problem.

I never even thought about it.

Ace

Lem Evans wrote:The process we use over at Bass Boat Bob's........move the o.d. of the pin up to 5/32" and then drive a smaller pin into the i.d. of the 5/32" pin.

Hmm
I never thought about that as well. May have to do this

Ace

BigDave65 wrote:I broke a pin a couple of years ago for the first time. I bought a bag of the mult-layer pins and have been just replacing it at the beginning of every season.

Yea that what I thought about. I fixed that dist I've been running for years and had a extra so I set it up the same (locked it out) and put a bronze gear on it so what this happened I cold just swap it in a few minutes.

Ace

Curt wrote:This will fix it!

I'm not even in that bracket....