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post #1 of (permalink) Old 02-14-2002, 01:22 AM Thread Starter
 
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Dana 30 breather fitting?

I was changing the oil in my front differential today. When I took the cover off massive amounts of this white-yellow manaise consistancy oily crap came out of their. I guess that it is an oil water mix. I drained it and blasted ass much of the crap out of the gear then replaced it with gear oil. I looked fro where any water could have entered and noticed their is no breather, just an empty hole on the top of the pumpkin. I would imagine that this could be bad for water entering and dirt, rocks, crude.... I would like to run a tube up to my radiator with a filler on the top.

What kind of fitting goes in the hole?

It is a dana 30, on a 79 cj5.
thanks
tony

79 CJ 5, 258, dana 30, model 20, T18, dana 20, 2.5" rancho lift, 1" shackles
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post #2 of (permalink) Old 02-14-2002, 11:09 AM Thread Starter
 
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Re: Dana 30 breather fitting?

can I put a breather/filter directly in that hole?

that wont help with water though?

thanks

79 CJ 5, 258, dana 30, model 20, T18, dana 20, 2.5" rancho lift, 1" shackles
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post #3 of (permalink) Old 02-14-2002, 12:37 PM
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Re: Dana 30 breather fitting?

That hole may be threaded, if so it's likely a 1/8 NPT and you can get a pipe thread to hose "barb" from any hardware store that sells plumbing fittings, screw it in and run some tubing up as high as need be. I wouldn't try to fill the diff from there though, the flow rate is terrible since the tubing ID is small plus the dif level is only supposed to be to the bottom of the fillhole, if you overfill it'll come out the cover, out the vent, out the pinion seal,axel tubes, etc generally make a mess, plus you may draw contaminants back in past the over stressed seals.

Do add the vent though, as high as possible and with some sort of filter. K&N used to have a small airfilter with three tubing nipples on the bottom for a consolidated vent set up, might make a nice point for the front diff, trans and transfer case to all vent to.

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post #4 of (permalink) Old 02-14-2002, 12:38 PM
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Re: Dana 30 breather fitting?

I got a front dana 30 that didn't have the breather either. I just put in a brass fitting that fit the hole and had a nipple for a hose. I ran the hose up from the axle and over the fresh air hose behind the passenger side headlight. I probably should put a filter on it but for now it is just turned down 180 degrees. My trans and transfer case are both vented similarly. The factory transfer case vent is just a piece of 1/8" tubing running up between the engine and firewall with a U bend at the top. My TH400 has a hose running from the vent it's top then draping over the brake booster. The rear axle has a hose attached to the long side tube and run up behind the passenger side fender behind the taillight.

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post #5 of (permalink) Old 02-14-2002, 04:33 PM
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Re: Dana 30 breather fitting?

I bet if you look around, you will find the vent hose that went to the axle...and it will most likely have the 90 deg fitting still stuck to it. Mine came off too and once its does, it won't do much good to put it back in..its a press fit.

I picked up a threaded fitting (1/8" I think) and threaded the hole and screwed in the fitting...and connected the hose back up. Of course, I can't stress the importance of pulling the cover first and putting in some shield to catch all the metal shavings when you tap out the hole.

John...
84CJ7, 3"lift, 32"BFG, 4.10's, R/ARB, F/Detroit, Onboard Air....89 Cherokee - New Project

They say we learn by our mistakes.....I guess thats why we are all so smart.
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