12 bolt cross shaft retaining bolt snapped off, any clever... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72timemachine · 04-17-2020, 04:39 PM

Ideas on how to remove it?

Hello,

I picked up this 12 bolt, 5 lug rear end the other day knowing it was in rough shape but hey, it's a 5 lug. Someone was using the bed as a dump trailer and never did any service on it. The drums are rusted onto the axles and 4 days of penetrating oil is not working, however that's the least of its problems.

While I don't claim to Mr. Goodwrench, I surmise the yoke on the pinion shaft hit something damaging the crush sleeve causing the pinion gear to ride on top of the carrier gouging teeth marks in it. The pinion shaft moves forward and back a 1/2 inch or so. This sent metal shavings into the gear oil and created what looks like metallic pudding. It was only when I cleaned off this thick goop that I noticed the retaining bolt what broken off. I can shove a small screwdriver into its hole a good 3/4 of an inch so that gives you an idea of how much of the bolt is missing and how far into the bolt hole it is. Anyone run into this broken bolt situation? I am thinking ever thing inside must be damaged and I would like to at least be able to remove the axles.

Here are some photos and thank you for any help.

Lee H · 04-17-2020, 05:48 PM

I made a tool about 25 years ago. 5/16 x 1/2 cap screw with a hole drilled through it, 1/8 x 12" long drill bit, and a small extractor. I think they now make a kit for this. Your pretty close if you want to borrow it.

**LockDoc** · 04-17-2020, 07:35 PM

-
Your local auto parts store may have the kit also.

This is the kit I bought.

https://www.freedomracing.com/dpk-01...actor-kit.html

LockDoc

72timemachine · 04-17-2020, 08:33 PM

Thank you both for the great information.

*randy500* · 04-17-2020, 08:47 PM

Usually they break off close to the head,i have worked many out with a hooked pick on the last broken thread.

*randy500* · 04-17-2020, 08:49 PM

Sorry i just read its broken deep inside.
On those i use a 4.5” grinder with a cut off disc, cut each side of the carrier through the center pin and retaining bolt.

68Gold/white · 04-17-2020, 09:23 PM

I've been able to drill into the broken off pin, and use an easy out for removal...several times...

**HO455** · 04-18-2020, 05:56 PM

If it is just the pin still in the shaft I have been successful with a small neo magnet epoxied to a rod and then used to fish the broken pin out. Tapping the carrier with a dead blow hammer seem to help.

68Gold/white · 04-18-2020, 06:54 PM

Mine have all broken in the threads, had to use easy out to un-thread

04-17-2020, 04:39 PM	#1
72timemachine Registered User Join Date: Oct 2008 Location: los angeles ca Posts: 210	12 bolt cross shaft retaining bolt snapped off, any clever... Ideas on how to remove it? Hello, I picked up this 12 bolt, 5 lug rear end the other day knowing it was in rough shape but hey, it's a 5 lug. Someone was using the bed as a dump trailer and never did any service on it. The drums are rusted onto the axles and 4 days of penetrating oil is not working, however that's the least of its problems. While I don't claim to Mr. Goodwrench, I surmise the yoke on the pinion shaft hit something damaging the crush sleeve causing the pinion gear to ride on top of the carrier gouging teeth marks in it. The pinion shaft moves forward and back a 1/2 inch or so. This sent metal shavings into the gear oil and created what looks like metallic pudding. It was only when I cleaned off this thick goop that I noticed the retaining bolt what broken off. I can shove a small screwdriver into its hole a good 3/4 of an inch so that gives you an idea of how much of the bolt is missing and how far into the bolt hole it is. Anyone run into this broken bolt situation? I am thinking ever thing inside must be damaged and I would like to at least be able to remove the axles. Here are some photos and thank you for any help. Attached Images

04-17-2020, 05:48 PM	#2
Lee H Registered User Join Date: Jun 2010 Location: Upland Ca Posts: 4,141	Re: 12 bolt cross shaft retaining bolt snapped off, any clever... I made a tool about 25 years ago. 5/16 x 1/2 cap screw with a hole drilled through it, 1/8 x 12" long drill bit, and a small extractor. I think they now make a kit for this. Your pretty close if you want to borrow it. Attached Images __________________ 1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 Last edited by Lee H; 04-17-2020 at 05:55 PM.

04-17-2020, 07:35 PM	#3
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,393	Re: 12 bolt cross shaft retaining bolt snapped off, any clever... - Your local auto parts store may have the kit also. This is the kit I bought. https://www.freedomracing.com/dpk-01...actor-kit.html LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

04-17-2020, 08:33 PM	#4
72timemachine Registered User Join Date: Oct 2008 Location: los angeles ca Posts: 210	Re: 12 bolt cross shaft retaining bolt snapped off, any clever... Thank you both for the great information.

04-17-2020, 08:47 PM	#5
randy500 Account Suspended Join Date: Jul 2016 Location: Tacoma, WA Posts: 6,873	Re: 12 bolt cross shaft retaining bolt snapped off, any clever... Usually they break off close to the head,i have worked many out with a hooked pick on the last broken thread.

04-17-2020, 08:49 PM	#6
randy500 Account Suspended Join Date: Jul 2016 Location: Tacoma, WA Posts: 6,873	Re: 12 bolt cross shaft retaining bolt snapped off, any clever... Sorry i just read its broken deep inside. On those i use a 4.5” grinder with a cut off disc, cut each side of the carrier through the center pin and retaining bolt.

04-17-2020, 09:23 PM	#7
68Gold/white Registered User Join Date: Sep 2011 Location: Ark City, Kansas Posts: 3,319	Re: 12 bolt cross shaft retaining bolt snapped off, any clever... I've been able to drill into the broken off pin, and use an easy out for removal...several times...

04-18-2020, 05:56 PM	#8
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 10,982	Re: 12 bolt cross shaft retaining bolt snapped off, any clever... If it is just the pin still in the shaft I have been successful with a small neo magnet epoxied to a rod and then used to fish the broken pin out. Tapping the carrier with a dead blow hammer seem to help. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

04-18-2020, 06:54 PM	#9
68Gold/white Registered User Join Date: Sep 2011 Location: Ark City, Kansas Posts: 3,319	Re: 12 bolt cross shaft retaining bolt snapped off, any clever... Mine have all broken in the threads, had to use easy out to un-thread



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