Cleaning out old transfer case oil??

1202 Views 10 Replies 6 Participants Last post by mac102004, Mar 27, 2019

Lweingart

Discussion Starter · Mar 25, 2019

94 fourtrax 300 4x4 / trx300fw

I bought a used transfer case off eBay and all seems to be in great shape. All the bearings are tight and it spins real nice. But it smells awful and I want to clean out all the old oil that's in it.

I don't really want to open up case I don't think the gasket is readily available. Is there something I can run threw it to clean it out?

Also what do you guys run in your transfer case? I've seen guys fill them with marine grease.

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shadetree

· #2 · Mar 26, 2019

dont split it !. the gasket is no longer around !!!. I run same gear oil that goes in the front and rear diff's...80w-90 full syn gear oil. if a gasket was around ? ( they are not ! ), you could just split it, wash it out that way with just about any kind of cleaner, I would use my parts washer in this case. in your case, just drain it, re-fill with fresh 80w-90 gear oil, and call it done

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shadetree

· #3 · Mar 26, 2019

you could even run reg motor oil in there if you did not have any gear oil ?, as this has no clutch to worry about, just gears and bearings, no clutches. JUST DONT RUN AUTO OIL IN THE MOTOR !!...LOL.

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shadetree

· #5 · Mar 26, 2019

Lweingart said:
shadetree said:

you could even run reg motor oil in there if you did not have any gear oil ?, as this has no clutch to worry about, just gears and bearings, no clutches. JUST DONT RUN AUTO OIL IN THE MOTOR !!...LOL.

Click to expand...

I run rotella in the motor

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as long as its made for wet clutches ?. your good, if not ?..well..lord help ya !..lol.

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shadetree

· #7 · Mar 26, 2019

wheeler said:
IF your looking to flush the case, toss some diesel fuel in, then rinse with gear oil multiply times until ur happy it’s all out.....

I see folks say flush with diesel a lot, but seeing how it has a flash point ?, something just tells me this is not a good idea.

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shadetree

· #10 · Mar 26, 2019

TBRider said:
shadetree said:

wheeler said:

IF your looking to flush the case, toss some diesel fuel in, then rinse with gear oil multiply times until ur happy it’s all out.....

Click to expand...

I see folks say flush with diesel a lot, but seeing how it has a flash point ?, something just tells me this is not a good idea.

Click to expand...

Diesel fumes don't ignite, just gas fumes.

i'd still would not want to take that risk..regardless if it wont do it for thiers ?. my luck..sure enough..BOOM !!..LOL.

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