Enjoy 5% OFF at VEVOR Canada! and Support Canadian Poncho at the Same Time!
Members Login
Username 
 
Password 
    Remember Me  
Canadian Poncho Homepage -> Canadian Poncho -> 65-70 Full Size Power Train Tech Forum -> broken screw - differential pinion shaft lock
Post Info TOPIC: broken screw - differential pinion shaft lock
seventy2plus2


Canadian Poncho Superstar!

Status: Offline
Posts: 7787
Date:
broken screw - differential pinion shaft lock
Permalink  

Gang, I was looking to remove the axle shafts from a 12 bolt diff, so after popping off the back cover and draining the oil, I removed the bolt that holds the pinion shaft in place.   The bolt came out, but the pin part of it stayed in the carrier, so the pinion shaft won't come out.    I remember seeing a post where this happened to someone else a couple years ago, but I can't find that post.     I see someone makes a kit with drill bits an easy outs to remove the screw, but I'd like to find the post to see what that member did.   Any help is appreciated.



__________________
70 2+2 convertible
70 2+2 hardtop
70 Parisienne hardtop

 

 
2drpost


Uber Guru

Status: Offline
Posts: 3463
Date:
Permalink  

some/most of them, i've been able to wind them out with a sharp point awl, or if it's broke right at the thread, a small tip magnet might fish it out. brake clean the oil from the hole.



__________________

 
Nov 18 to Dec 2 Black Friday UP TO 50% OFF Plus Huge Coupons
Nov 18 to Dec 2 Black Friday UP TO 50% OFF Plus Huge Coupons
4SPEED427


A Poncho Legend!

Status: Offline
Posts: 50210
Date:
Permalink  

Yes, more often than not a bit of persistance with a pick is all it takes.

__________________

1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
seventy2plus2


Canadian Poncho Superstar!

Status: Offline
Posts: 7787
Date:
Permalink  

Thanks guys, I think the awl or magnet ideas are worth a try.



__________________
70 2+2 convertible
70 2+2 hardtop
70 Parisienne hardtop

 

 
seventy2plus2


Canadian Poncho Superstar!

Status: Offline
Posts: 7787
Date:
Permalink  

Got it out.  I wanted to try the magnet idea, but couldn't find the skinny magnet I used to have.   I'm not sure it would have worked, as I figured there was still some thread left on the broken portion.     My buddy drilled out a 5/16" bolt with a 1/8" diameter hole through it and we put in in the housing (I'll call that the guide bolt, not shown).   I then sent a 7/32" bit through the guide bolt, into the broken portion of the screw.   I pulled out the guide bolt, washed out the debris with brake-clean, and pounded in a spiral easy-out.  It didn't work, as I figured I hadn't drilled deep enough.  Since there was now a hole in the broken portion, I didn't need the guide bolt again, and I just drilled deeper.   I figured the hole in the broken portion was now about 1/4" deep, and pounded in the spiral easy out again.   Turned it real slow and steady, and eventually the broken portion was out.  It had about 1 thread left on it, so a magnet would have never pulled it out.     

Differential Pinion Shaft Screw.JPG



Attachments
__________________
70 2+2 convertible
70 2+2 hardtop
70 Parisienne hardtop

 

 
pontorquer


Poncho Master!

Status: Offline
Posts: 2532
Date:
Permalink  

Congrats Clint ! Good you got it out ...



__________________
seventy2plus2


Canadian Poncho Superstar!

Status: Offline
Posts: 7787
Date:
Permalink  

Thanks Pascal, now I have to find a new one.  I've got an old GM # that I hope still works.



__________________
70 2+2 convertible
70 2+2 hardtop
70 Parisienne hardtop

 

 
Nov 18 to Dec 2 Black Friday UP TO 50% OFF Plus Huge Coupons
Nov 18 to Dec 2 Black Friday UP TO 50% OFF Plus Huge Coupons
Greaser


Canadian Poncho Superstar!

Status: Offline
Posts: 5040
Date:
Permalink  

seventy2plus2 wrote:

Thanks Pascal, now I have to find a new one.  I've got an old GM # that I hope still works.

 Clint..the threaded portion of the hole should be cleaned out before you put in a new pin....... run a tap through.....I got a bunch if you need one.

George



__________________
JC2+2


Poncho Master!

Status: Offline
Posts: 1767
Date:
Permalink  

I know it's too late to help since the job is done, but for future a reverse drill bit can work too. As you drill, it spins the broken bolt out (usually only one thread left on the bolt). Just thought I'd add. And by the way good job removing it your way.



-- Edited by JC2+2 on Sunday 11th of May 2014 07:53:08 PM

__________________

'68 Parisienne 2+2 Convertible Matador Red (Resale Red but not for sale).
cdnpont


Canadian Poncho Superstar!

Status: Offline
Posts: 10617
Date:
Permalink  

Glad you recovered it without much trouble.

A car guy at work once called that differential fastener "The bolt of Death".



__________________
 67 Grande Parisienne 4 door HT. 69 Parisienne Convertible.
 
seventy2plus2


Canadian Poncho Superstar!

Status: Offline
Posts: 7787
Date:
Permalink  

Fortunately, the differential is out of the car and on a set of sawhorses, as I'd hate to have been doing this laying on the ground under the car.



__________________
70 2+2 convertible
70 2+2 hardtop
70 Parisienne hardtop

 

 
4SPEED427


A Poncho Legend!

Status: Offline
Posts: 50210
Date:
Permalink  

cdnpont wrote:

Glad you recovered it without much trouble.

A car guy at work once called that differential fastener "The bolt of Death".




Years ago at our dealership someone instigated a rule that any time that bolt was removed in a diff, it went in the garbage and a new bolt was put in.

__________________

1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
Nov 18 to Dec 2 Black Friday UP TO 50% OFF Plus Huge Coupons
Nov 18 to Dec 2 Black Friday UP TO 50% OFF Plus Huge Coupons
hawkeye5766


Canadian Poncho Superstar!

Status: Offline
Posts: 6067
Date:
Permalink  

You guys are good, sounds like a post for tricks of the trade for future reference? Glad you got it out and I will be putting a new one in my 8.8

__________________
seventy2plus2


Canadian Poncho Superstar!

Status: Offline
Posts: 7787
Date:
Permalink  

I bought a new bolt today, p/n 25872305 (superceded 14056196) as original p/n 472546 is discontinued (still available on ebay though).   The new bolt has a smaller head which isn't a concern, but it's 1/4" shorter than the original.   Original was 2" long (not counting the head).   Any comments?



__________________
70 2+2 convertible
70 2+2 hardtop
70 Parisienne hardtop

 

 
4SPEED427


A Poncho Legend!

Status: Offline
Posts: 50210
Date:
Permalink  

Should be fine, that's the one we've been selling at work for a few years now.

You could just check to see that it sticks far enough into the pin.

I like the smaller head idea, less chance of overtightening it.

__________________

1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
seventy2plus2


Canadian Poncho Superstar!

Status: Offline
Posts: 7787
Date:
Permalink  

The new bolt will just go through the shaft, not through it with 1/4" extending into the other side of the carrier.  There was a guy on ebay selling a set of multiple 472546's so I got a little silly and bought them (keep in mind I have 4 cars that use them).

I know it'll take a little time for them to get to me, but I've got other work to do on the differential including blasting and painting the brake backing plates, etc.    If I get real anxious, I'll install the 25872305 screw, otherwise I can return it and get my $10 back.     



__________________
70 2+2 convertible
70 2+2 hardtop
70 Parisienne hardtop

 

 
Page 1 of 1  sorted by
 
Quick Reply

Please log in to post quick replies.
Canadian Poncho Homepage -> Canadian Poncho -> 65-70 Full Size Power Train Tech Forum -> broken screw - differential pinion shaft lock
Tweet this page Post to Digg Post to Del.icio.us
.
Support Canadian Poncho!
Select Amount:
<
.
.
.