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Anyone ever had a replacement oil pump w/a hardened gear?
https://slantsix.org/forum/viewtopic.php?t=39548		 Page 1 of 1
Author:  bmimken [ Wed Mar 24, 2010 2:16 pm ]
Post subject:  Anyone ever had a replacement oil pump w/a hardened gear?
Has anyone ever had a replacement oil pump come with a hardened gear already installed on it?

My replacement is a Melling, and the gear is a dead ringer for the hardened oil pump gear I was going to replace it with. Can you tell by appearance wether a gear has been hardened, or not? I thought the hardenening process gave the gears a darker appearance?

Brian
Author:  Doc [ Wed Mar 24, 2010 2:33 pm ]
Post subject: 
The only way to know is to have the gear(s) Rockwell tested for hardness.
We have tested many gears over the years... they all looked alike but the hardness ratings went from a low of 16 Rc to a high of 34 Rc for the carborized gears. (case hardening)
DD
Author:  Rick Covalt [ Wed Mar 24, 2010 2:34 pm ]
Post subject:  Darker yes
I think the one I got from Doc was darker for sure. But I believe it has a tiny "DD" engraved on one of the ends. Don't know if he did them all that way or not. I'm sure he chime in.

Rick
Author:  Rick Covalt [ Wed Mar 24, 2010 2:35 pm ]
Post subject:  Sorry
Sorry Doc , you posted while I was typing!

Rick
Author:  bmimken [ Wed Mar 24, 2010 2:47 pm ]
Post subject: 
Thanks Doc and Rick for chiming in so quickly!

I will obviously not try to judge a gear by it's color ever again! :wink:

Doc, do you have a favorite type of puller you use to remove the oil pump gears?

Brian
Author:  Doc [ Wed Mar 24, 2010 3:22 pm ]
Post subject: 
The puller I use is a modified tie rod end puller.
If there is no Keyway, you can remove the cover and press (drive) the impeller shaft out of the gear.
DD

Image
Author:  bmimken [ Wed Mar 24, 2010 5:10 pm ]
Post subject: 
Thanks Doc! :)

Brian
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