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Old 12-16-2010, 04:26 PM   #1
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Default Changing diff fluid

Of course I know HOW to actually change the fluid but my question is how do you guys do it as far as getting old fluid out? In particular i'm changing fluid weights and usually take all the gears and shaft out and then clean the case and gears as well as i can but it takes forever and is pretty messy. Am i ok to just drain the old fluid and fill with the new instead? Or is the full clean the usual method?
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Old 12-16-2010, 04:40 PM   #2
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My Way:

If I have time

1.Dissemble diff
2.Take it all apart
3.Put in a container and spray the case and gears down with cleaner
4.Then leak sit for 10 mins
5.Whilst that is going on, check Oring clean and re grease
6.Then flush out any remaining oil..
7.Dry off- leave 10 mins.. then put it back together again...
8.And making sure diff bearing's are all ok ect too..


I generally run the same 5-5-3 most places I run...

I will do complete redo after every 2 races
But otherwise.. just clean the internals and gears..out with some paper towl.. and put in fresh oil...


Simples
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Old 12-16-2010, 04:41 PM   #3
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I usually pull all the gears out and put them in a tea strainer and swish it around in naphtha. It cleans the gears really well. As for the case I spray it down with WD-40 and blow it out with compressed air. This is the easiest method that works for me.
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Old 12-16-2010, 08:04 PM   #4
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As posted above, I use this:

http://www.gmksupply.com/html/gmk0112.html

GMKs Diff Dunker is just a plain old tea strainer, and Naptha is available every where, but I love this tool and the method GMK shows.
Makes cleaning diff parts 100 times less of a headache.
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Old 12-16-2010, 10:09 PM   #5
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what works fro me is take out all the gears lay them out on a very absorbent paper towel to help suck the oil and let time take its course. usually they are drained in about 30 minutes. you can also stuff some towel in the case to suck out the oil. If I am rushed for time I will spray some contact cleaner on the parts to break up the oil a little and get it to flow faster.
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Old 12-16-2010, 10:54 PM   #6
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Naphtha is truly magical stuff.
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Old 12-17-2010, 01:02 AM   #7
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Quote:
Originally Posted by imaxx21 View Post
Naphtha is truly magical stuff.
crash is the smell really strong i have some rare birds and we try to watch what we use in the house around them.
let me know
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Old 12-17-2010, 01:08 AM   #8
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it has a smell for sure, might want to use it out in the garage or something

with the diff dunker you'll be amazed how good it cleans
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Old 12-17-2010, 01:15 AM   #9
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made this thread a few years ago

http://www.unlimitedengineering.com/...ad.php?t=19075
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Old 12-17-2010, 01:39 AM   #10
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Trackside oil changes:

I strip the diff down, stick the whole lot into a little tub and squirt it with brake cleaner then let it sit for a while. Remove and dry it off.

Simples.
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Old 12-17-2010, 03:59 AM   #11
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Quote:
Originally Posted by imaxx21 View Post
it has a smell for sure, might want to use it out in the garage or something

with the diff dunker you'll be amazed how good it cleans
thanks man.
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Old 12-17-2010, 04:08 AM   #12
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i open the diff and turn it upside down and let sit for 10 mins or so and then i take the gear out and spray them down with
http://www.homedepot.com/h_d1/N-5yc1...atalogId=10053
the stuff is safe on plastic and works great

we spray clutch bearings out drivetrain in certin spots and use it for just about everthing

oh and you can buy to cans for the price of one nitro cleaner
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Old 12-17-2010, 04:26 AM   #13
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Just sit the internals etc on some baby wipes...
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Old 12-17-2010, 02:04 PM   #14
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i use naphtha in the cup and gears after i dump out the old stuff. just fill, spin a couple times with a rag and redo till the gears are shiny.
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Old 12-17-2010, 07:54 PM   #15
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Next time you are at Wally World or the hardware store pick up a gallon of "odorless" mineral spirits.
I also have a couple of quart sized jars (thick glass) that I fill with mineral spirits about half way.
Every thing goes in the strainer except the o'rings and the gasket. The first jar used becomes the dirty jar and I make sure just about all the goo comes out in that one. The second jar stays clean and acts as a final rinse. When you take the parts out just set them aside on a paper towel for a short while and they self dry. Perfectly clean. Does not hurt the case.
Dirty batch can be used for a long long long time.

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