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Unread 01-08-2010, 03:44 PM   #1
Pog
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1984 CJ7 
 
Join Date: Sep 2004
Location: In A Van, Down By The River!
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Model 20 Fluid Change Question

Go on and call me lazy, but is it possible to just pump the fluid out of the Model 20 pumpkin through the fill hole?

All I want to do is change the fluid which I know is about a 1.5 years old. So, why bother with the PITA Torx bolts, gasket, etc. if I can help it just to refresh the fluid. Just curious if anybody has done this.

Thanks

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Unread 01-08-2010, 03:48 PM   #2
Fjguercio
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1978 CJ7 
 
Join Date: Dec 2007
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why not? I would still warm it up so it flows of the parts to the bottom better and flows in pump better than winter temps.

They also have after market covers that have a drain plug and are HD. I may get one of those some day. There are also gaskets you can reuse, they cost about $15-20 and summit or quadratec had them.
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Unread 01-08-2010, 03:53 PM   #3
CSP
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You could, but then you couldn't inspect the internals for any damage that may or may not be present.

If you do pop the cover, replace the torx head bolts with hex heads so you eliminate that problem in the future. Permatex "The Right Stuff" beats any gasket that I've ever used.
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Unread 01-08-2010, 03:57 PM   #4
Pog
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Quote:
Originally Posted by Fjguercio View Post
why not? I would still warm it up so it flows of the parts to the bottom better and flows in pump better than winter temps.

They also have after market covers that have a drain plug and are HD. I may get one of those some day. There are also gaskets you can reuse, they cost about $15-20 and summit or quadratec had them.
Definitely need to warm up the fluid right now. Geez it's cold outside. I'm web-wheelin' today.

If it's plausible, I just need to see if I can find a pump that will do it. I think I saw one at the local auto parts house a while back. I had seen the reusable gaskets for most of the Dana axles, but not the AMC 20. I'll look at Summit to see.

Thanks
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Unread 01-08-2010, 04:03 PM   #5
Pog
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1984 CJ7 
 
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Quote:
Originally Posted by CSP View Post
You could, but then you couldn't inspect the internals for any damage that may or may not be present.

If you do pop the cover, replace the torx head bolts with hex heads so you eliminate that problem in the future. Permatex "The Right Stuff" beats any gasket that I've ever used.
I hear ya. I did that about a year and a half ago when I changed the fluid and gasket. Eveything was fine and my CJ has pretty much just been garaged or on the street for the weekend. No severe duty was done enough to make me worry otherwise. Heck, the fluid in it probably still good. I just got a very good deal from a friend on a case of Royal Purple and figured I would change everything out for the heck of it.

I have also heard good things about "The Right Stuff."

Thanks
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Unread 01-08-2010, 04:08 PM   #6
77j20
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Thats all we do at work when we do a differential service. Unfortunately quick lube shops don't have the time to take covers off and re-install them, it just wouldn't be worth it. We use a pump to suck all of the old fluid out on diffs that don't have drain plugs. We do pump new fluid in and suck it out so it gets somewhat of a flush.
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