Cleaning out old transfer case oil?? - Honda ATV Forum
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post #1 of 11 (permalink) Old 03-25-2019, 05:59 PM Thread Starter
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Cleaning out old transfer case oil??

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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post #2 of 11 (permalink) Old 03-25-2019, 06:46 PM
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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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post #3 of 11 (permalink) Old 03-25-2019, 06:48 PM
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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.

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '08 vt750c2 shadow spirit
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post #4 of 11 (permalink) Old 03-25-2019, 09:03 PM Thread Starter
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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.
I run rotella in the motor

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post #5 of 11 (permalink) Old 03-25-2019, 09:23 PM
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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.
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.

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '08 vt750c2 shadow spirit
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post #6 of 11 (permalink) Old 03-25-2019, 09:39 PM
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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.....
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post #7 of 11 (permalink) Old 03-25-2019, 09:42 PM
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IF your looking to flush the case, toss some diesel fuel in, then rinse with gear oil multiply times until ur happy itís 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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post #8 of 11 (permalink) Old 03-26-2019, 08:32 AM
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IF your looking to flush the case, toss some diesel fuel in, then rinse with gear oil multiply times until ur happy itís 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.

Diesel fumes don't ignite, just gas fumes.
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post #9 of 11 (permalink) Old 03-26-2019, 08:44 AM
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I'd flush with diesel and then let it drip dry upside down, then fill with gear oil.

If you drain it well and fill it with oil I don't think you have to worry about anything firing off.
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post #10 of 11 (permalink) Old 03-26-2019, 09:39 AM
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Originally Posted by shadetree View Post
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Originally Posted by wheeler View Post
IF your looking to flush the case, toss some diesel fuel in, then rinse with gear oil multiply times until ur happy itís 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.

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.

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '08 vt750c2 shadow spirit
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