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Old 08-20-2013, 04:11 PM   #1
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R1200GS gearbox and final drive change question

Read about everything there is about oils, etc. but one thing popped up that was interesting: a few people put ATF in the gearbox after draining and run the bike a few minutes and then drain it before putting in new gearbox oil. Is this recommended? Is there a clean that is similar for the final drive? Thanks for any input......
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Old 08-20-2013, 04:33 PM   #2
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Some use ATF as a flush..no harm in it..but if your oil came out clean..no real need..

I've done it with my tranny..it's always cruddy looking..my final on the other hand..always looks like the day I put it in..
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Old 08-20-2013, 04:44 PM   #3
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Just plain wrong on many levels.
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Old 08-20-2013, 04:54 PM   #4
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Just plain wrong on many levels.


Line us out..

Def does it..I've done it..it may be an ol' wives tale.. ..

I know I was taught by an ol' timer..of course he only had 60 years doing this stuff..and he may have done it wrong..

Tell me..I'm here to learn too!

I know it can hurt NOTHING...
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Old 08-20-2013, 05:22 PM   #5
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I take it the goal is to try and remove contamination from the final drive?
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Old 08-20-2013, 05:38 PM   #6
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You can use ATF like a flushing or cleaning product. Kind of like flushing your radiator with clear water to remove old coolant. Not recommended for extended use, but no harm for a very short period.

Think of ATF used this way as a very mild solvent.

Have used ATF in a corporate garage to flush out engines in vehicles that were left with the press for extended road tests. Some of those clowns didn't know that you should change the engine oil every so often. Thankfully those vehicles were never intended to be sold to the public.
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Old 08-20-2013, 07:07 PM   #7
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I take it the goal is to try and remove contamination from the final drive?
Maybe not contamination per se...but ATF is very effective at breaking down any varnishes that MAY build up..

OP ask if it COULD be done..I said yes..some do..that is all..I didn't tell him to do it..I have done it in my tranny..

It will hurt nothing..would I drive it around? no..I put some in..ran it in first at idle for a minute or so..and dumped the it..let it drain well..completed the service..
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Old 08-20-2013, 08:00 PM   #8
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It will hurt nothing..would I drive it around? no..I put some in..ran it in first at idle for a minute or so..and dumped the it..let it drain well..completed the service..
So it's safe to say that the new gear oil is now slightly contaminated by however much transmission fluid that didn't drain out. Cleaning the 'varnish' will also break down the coating the manufactures carefully blend that helps protect during initial use. Is it possible the light weight transmission fluid could find it's way past the sealed bearings and dilute the grease?
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Old 08-20-2013, 09:24 PM   #9
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So it's safe to say that the new gear oil is now slightly contaminated by however much transmission fluid that didn't drain out. Cleaning the 'varnish' will also break down the coating the manufactures carefully blend that helps protect during initial use. Is it possible the light weight transmission fluid could find it's way past the sealed bearings and dilute the grease?
Contaminated..yes..a couple drops..enough to change oil viscosity..prolly not..

I don't think it removes coatings..it doesn't break down steel..if the "coating" is there for initial use..what is it..and does it need to remain at 50,000?

No..that's why it's called a sealed bearing

I'm assuming you aren't going to ever do this..thats ok..I care not one iota..I've cleaned up the top end on prolly..20 motors this way..no biggee...one time, we were trying to get a top end flowing again that some dumb azz put Pennzoil in..we put a gallon of diesel fuel in it..ran it for 30 minutes..changed it out for oil..problems solved..the minute amount of residual fuel..did nothing to the oil...just followed up with a second oil change.

Other side of the coin..BMW said the oil was lifetime fill in the finals..how did that work out...if memory serves..a helluva lot worse than a couple drops of atf..in a pint of gear oil..

YMMV..
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