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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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Old 05-12-2013
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New Owner Transmission Question

Big day for baseline maintenance of our newly-acquired O'Day 322. Adjusted valve lash, changed coolant, engine oil and trans oil. I ran into a big "ponderable" while changine the transmission oil. I have the KM2P transmission which according to everything that I have seen is supposed to have SAE 30 engine oil in it. Mine had ATF in it. Do we have any opinions as to the extent of the damage this could have caused? There is no telling how long the ATF fluid had been used...
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Old 05-12-2013
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Re: New Owner Transmission Question

Good question, get that stuff out of there immediately. If the transmission cone isn't slipping now, I would say you're OK.

I made this mistake the first year I owned my catamaran, which has a pair of Yanmars with the same transmission as your boat. I drained flushed and refilled with SAE 30, and she's worked fine ever since.
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Old 05-12-2013
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New Owner Transmission Question

The safest bet is to follow what the manufacturers manual recommends down to the letter. Older manuals cannot always anticipate future standards such as the Dexron ATF standard. Read the labels very carefully of whatever you buy to make sure it conforms to the requirements. I was surprised by the many variations of ATF out there
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Old 05-12-2013
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New Owner Transmission Question

obviously follow the manufacturers recommendation but you should be fine. as an example i race a single seat open wheel formula car. while the tranaxle manufacturer recommends a 30w gear oil some guys run Dextron (trans oil) or a 7W gear oil to reduce mechanical resistance as both are much thinner viscousity. we run the engines at 7000 rpm and cars at about 120mph on the straights and the trannnys hold up so I think youll be fine as in yr Oday the trans is really living a sedate life comparatively
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Re: New Owner Transmission Question

Thank you everyone for the feedback...when I "saw red" while pumping it out, I felt sick to my stomach...
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