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Old 10-10-2018   #1
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Removing a diff locking retaining pin

So i did see this pin on my diffs... it locks the shaft holding the sun / plannet gears

Its not a hex / or torxs

It like a bit of metal folded over....

How the hell do you get the thing out....
Im looking to get a 2nd diff to repair my current box...
Item 5 in picture

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Old 10-10-2018   #2
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Re: Removing a diff locking retaining pin

Looks like a Roll Pin. aka a Spring pin https://en.wikipedia.org/wiki/Spring_pin
Normally you can get these out with a Punch, did find an easy way to remove these on youtube
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Last edited by Scudmonkey; 10-10-2018 at 23:24.
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Old 11-10-2018   #3
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Re: Removing a diff locking retaining pin

Quote Originally Posted by Scudmonkey View Post
Looks like a Roll Pin. aka a Spring pin

Googling the part number shows it is a coiled spring pin
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Old 11-10-2018   #4
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Re: Removing a diff locking retaining pin

These are known as roll pins. Spring steel, tight in their hole, so hold themselves in.

To remove or replace, need a parallel punch of same diameter as the hole, or as close as possible. Too small and it will tend to jam in the centre of the pin, making things worse.
Support the opposite side and tap the punch firmly with hammer. A small hammer is usually enough.

Never re-use. Always replace with a new one.
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Old 11-10-2018   #5
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Re: Removing a diff locking retaining pin

This is whats weird...
There is NO hole the other side to punch it out with.... 1way street.....

Ill get piks when i can
Currently fitted a donor box and its not the best..... so need to get a move and find another....

Ziggy
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Old 11-10-2018   #6
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Re: Removing a diff locking retaining pin

Quote Originally Posted by Ziggy122 View Post
This is whats weird...
There is NO hole the other side to punch it out with.... 1way street.....

Ill get piks when i can
Currently fitted a donor box and its not the best..... so need to get a move and find another....

Ziggy
Always a pain when a rollpin is in a blind hole. Need to get something into the centre of it, to grip and drag it out, but that is difficult as it is a hardened steel pin. An eezi-out is usually too wide a taper. A self-tapping screw can work, if you can find the right one, whatever that might look like. Anything too tight will try to spread the pin and make it grip more, not tight enough and it won't grip.

Good luck with that. Much swearing and many tears are likely.
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Old 11-10-2018   #7
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Re: Removing a diff locking retaining pin

Quote Originally Posted by Ziggy122 View Post
This is whats weird...
There is NO hole the other side to punch it out with.... 1way street.....

Ill get piks when i can
Currently fitted a donor box and its not the best..... so need to get a move and find another....

Ziggy
Typical Fiat LOL Make something easy into something difficult
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Old 12-10-2018   #8
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Re: Removing a diff locking retaining pin

Is the other hole hidden by the large drive wheel?

Otherwise I found a few methods that are claimed to work for small spring pins in blind holes,


The simplest is to hydraulically force it out by getting some stiff strong wire like piano wire or some alternative round thin object that will fit into the opening. Fill the whole with thick paste or grease or clay and hydraulically force it out by hammering the wire into the hole.

Then you get into tiny taps and screws and slide hammering it out, or welding something to the end of it and slide hammering it out.
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Old 13-10-2018   #9
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Re: Removing a diff locking retaining pin

When i get 5 and dry weather ill get some pickys
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Old 25-10-2018   #10
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Re: Removing a diff locking retaining pin

Did you ever manage to get the Pin out ?
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Old 14-12-2018   #11
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Re: Removing a diff locking retaining pin

Quote Originally Posted by Scudmonkey View Post
Did you ever manage to get the Pin out ?
So some time later (2months)

Drilling is the only option

The you have to smash the main pin out to break the last bit off

You cant force it without weakening it


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Old 14-02-2019   #12
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Re: Removing a diff locking retaining pin

Quote Originally Posted by Ziggy122 View Post
So some time later (2months)

Drilling is the only option

The you have to smash the main pin out to break the last bit off

You cant force it without weakening it


Ziggy
https://www.docdroid.net/dV4MutG/fia...al.pdf#page=39


I just found this fiat c514.5 repair manual. Believe it or not the recommended procedure to remove that pin is to crack the differential carrier using a chisel at the other side of the pin and then punch it through!

They also have a procedure to check the differential bearing preload which would have to be a must if you are changing differential carriers.
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Last edited by judderbar; 14-02-2019 at 18:12.
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Old 14-02-2019   #13
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Re: Removing a diff locking retaining pin

Quote Originally Posted by judderbar View Post
I just found a fiat c514.5 repair manual. Believe it or not the recommended procedure to remove that pin is to crack the differential carrier using a chisel at the other side of the pin and then punch it through!

They also have a procedure to check the differential bearing preload which would have to be a must if you are changing differential carriers.

I just dont know how to upload the PDF or were to put it as it applies to about 6? cars.
Drillin it was a bitch.... i did wonder about back drilling tbh....

But cracking it.... no no no.... that will cause problems elsewhere i can see it...

Ziggy
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Old 14-02-2019   #14
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Re: Removing a diff locking retaining pin

Quote Originally Posted by Ziggy122 View Post
Drillin it was a bitch.... i did wonder about back drilling tbh....

But cracking it.... no no no.... that will cause problems elsewhere i can see it...

Ziggy
I found a free PDF version. https://www.docdroid.net/dV4MutG/fia...al.pdf#page=39

The instructions are on fiat page 28 which is electronic page 30 of the PDF
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Last edited by judderbar; 14-02-2019 at 18:44.
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