95 Big Bear 350 Water in Differential. - Yamaha Grizzly ATV Forum
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post #1 of 4 Old 01-10-2017, 10:38 PM Thread Starter
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95 Big Bear 350 Water in Differential.

Found my oil in my rear diff had water in it so about 3 months ago I replaced the oil and just checked it and found yet again it was watery. Thinking I'll just do differential seals as that is what normally allows this. but first wanted some input, the diff doesn't leak a drop from anywhere. It is a possibility it is allowing water in at the differential connection to the swingarm and where the housing bolts together. I don't think I've ever gone past the diff vent tube in water so that probably isn't an issue, if I do seals I'll be routing the hose up high to rule that out. If anyone has some ideas it would be greatly appreciated! Thanks
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post #2 of 4 Old 01-11-2017, 08:26 AM
 
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Do your axle seals as well as your diff seals. I am betting you may find a axle tube full of rust and water.

Additionally, since you have it apart, you should drill the axle tube and install a grease zerk. Once you reassemble everything, pump the axle tube full of grease.
The reason I tell you this is because these bikes are known for stripping the axle splines where the diff crown gear sits. Finding a good used axle is nearly impossible, and new ones cost more than the bike is worth. The stripped splines happens due to corrosion caused by water entry or condensation. Filling the tube full of grease prevents water from ever corroding the splines again.
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post #3 of 4 Old 01-11-2017, 03:14 PM Thread Starter
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The quad didn't sit with water in the oil for very long as I replaced the oil when it got water it it; but I'll need to pull the axle and the diff off to replace seals also inspect pinion and such, and a new bearing I have for the axle. I'll inspect the splines when I have it apart. Does the sealed bearing on the left hand side of the quad act as a seal for the axle housing? Because that bearing is not sealed but I am replacing it with a sealed one.
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post #4 of 4 Old 01-11-2017, 03:55 PM
 
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There should be an axle seal installed outside of that axle bearing. If not, that is where your water is coming from more than likely.
There is bearings and axle seals installed on both side of the axle, diff side and brake side.

Go to a online parts diagram. Look under "Rear Wheel". You will see the bearings and seals parts breakdown there.
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