ATF Fluid Change

[Ironman10]

I was doing my pre-season change of fluids and replacing the impeller. When drawing down the last of the ATF using the vacuum extractor the end of the tube had a grey kind of sludge on it. I have a ‘21 Makai with a 400 raptor. Any thoughts on it? Is it a concern? TIA


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[MJHSupra]

Ever have any shifting issues or slipping? If the answer is no, I would run the boat a few outings and change it again to see what you find.

I've heard of people flushing a vdrive if it had water get in there, but unaware of boat trans flushes.

Also have not heard of many trans cooler issues or line issues on newer boats.

[Ironman10]

Ever have any shifting issues or slipping? If the answer is no, I would run the boat a few outings and change it again to see what you find.

I've heard of people flushing a vdrive if it had water get in there, but unaware of boat trans flushes.

Also have not heard of many trans cooler issues or line issues on newer boats.

I haven’t noticed any slipping. I did have the FPP1-2 lower than expected error (SPN 91 PMI 1 at the end of last season. Service came out and replaced fuel pump. They tested and said all seemed fine, but then the season ended and I didn’t get back out at all.


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[Holdmybeer]

I pulled some gunk out of mine when I first got it. I think these drive condensate a little running in cold water. The gray could be break in residue if this is your first fluid change.

[Ironman10]

Appreciate the input. I’ll plan to run it for a few outings and then change the ATF again to see if there is any additional residue.


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[996scott]

I think Holdmybeer is right. I just changed the transmission fluid in an older boat this week and had the exact same thing happen. The fluid looked to be in great shape but there was a little grey sludge on the edge of the extractor hose like you had. I'm not too worried about it as the fluid looked perfect. I plan to recheck after putting some hrs on it.