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Old 08-30-2001, 07:45 AM   #1 (permalink)
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Any tips, hints, suggestions? My buddies YJ takes on water like an upside down frizbee in a hurricane, and after we go wheeling (every time) we have to drain and refill his front diff. This is getting old <IMG SRC="smilies/pissed.gif" border="0">
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Old 08-30-2001, 07:48 AM   #2 (permalink)
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? from where? Is is diff cover and vac disco all sealed up correctly? I took mine through about 3 ft of water/mud last time I went out. No water contamination at all in the front diff....
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Old 08-30-2001, 08:01 AM   #3 (permalink)
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either something isnt sealed correctly or his breather tube is cracked, etc. I used to submerge my D30 regularly and never took on water.
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Old 08-30-2001, 08:05 AM   #4 (permalink)
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It appears to be coming in from ends of the axle, and it looks like the only thing to stop it from coming in is the white plastic things near the spindles. I'll try to get him to take a couple pics of it today and post them.
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Old 08-30-2001, 11:16 AM   #5 (permalink)
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Give DTD Drivetrain Direct a call. They have an axle seal for the ends that keeps the water out. It is really made for the d44 axle, but it will fit the d30 if you have the 297 shafts. They are about $135 for the pair. If you don't want to do that I would replace the internal seals to keep the water out. I would post a pic, but I can't get to my Photopoint account because of the new firewall at work. You can look up my account with this e-mail addy astape@aol.com.
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Old 08-30-2001, 11:18 AM   #6 (permalink)
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Tanks <IMG SRC="smilies/wink.gif" border="0">
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Old 08-30-2001, 12:21 PM   #7 (permalink)
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The number one cause of water entering the axles, is bad venting.
The D30 has a very small 1/8" vent tube nipple, which if you take the hose off youll see it really only has a small pin hole on the inside.
What happens is your gear oil gets warm when your driving and it heats up the air in the tubes, when you enter a water crossing, the air inside is quickly cooled and if the pinhole vent cant keep up with equalizing the change in air volume, then it start trying to draw in from the next available opening,... your outer seals.
I have found if you remove the puny vent nipple, and drill and tap the hole for a 1/4" NPT thread, then thread a length of compressor hose with a male 1/4" NPT into it. Route it high enough to not be submerged, and your, water contamination will go away.
We used to do a lot of Mud Bogg Racing, in our Ford, If I didnt modify and keep the vent tubes clear, the diff oil wouldnt last one day of racing, without looking like milk.
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