Is this a tool?

[Skyline]

In a tool collection I just bought, I just found an unusual item. Looks like a 1" bolt, but instead of threads there are splines. On the top of the head, it is labeled: 5P961

Is this a special tool of some sort, or is it a part? This guy worked on a lot of big diesels and heavy equipment, so it could be from anything. Anyone recognize this?

 

[FoMoCoPower]

kinda looks like an axle shaft of some sort.

 

[warmpancakes]

clutch alignment tool

 

[mrholeshot]

I'm not 100% sure but it looks like the tool used to hold the alxe carrier on large eaton differentials so you can torque the ring gear bolts.

 

[Moose-LandTran]

It's for removing the prechamber nuts on Caterpillar indirect injection engines.

http://cgi.ebay.com/ebaymotors/CAT-...Z360275249078QQptZMotorsQ5fAutomotiveQ5fTools
http://cgi.ebay.com/Caterpillar-Hea...=BI_Heavy_Equipment_Parts&hash=item2307aac97a

 

[mrholeshot]

We have a winner!!

 

[Skyline]

Thanks Moose!

 

[Bruce Lancaster]

Looks like a cylinder head nail, to me! :;

 

[RbrtAWhyt]

Moose is the man...

 

[aas5f6]

Impeller removal tool for a jet ski. Have that exact tool.