Which manual do you have? The "89" or the "79".
January 89...That's the problem. I got the manual from Coachinfo and this is what they sent me for a 1980 MC9.
So here's another thing. I talked to Luke and he said that they used AFT in thier non-integral MC9's. Not realizing my manual was the wrong year, I put 10W40 in the power steering, which is what the manual called for. Evidently 10W40 is used for intergral steering. When I added oil there was none showing in the resevor, the oil leaking out didn't smell like ATF and the manual said 10W40, so I used 10W40. I've got maybe 300 miles on the bus since adding 10W40, which was actually a year ago. It has a pretty decent leak, so I've added 2 quarts of 10W40 in that time. The bus drives great and other than having that leak, doesn't show any other signs of any problems.
So the big question is.....shouldn't I be seeing big problems from mixing ATF and motor oil, assuming I had ATF to begin with? At this point, I'll try to seal up the leak around the big nut, but I don't know what to do about the oil. I can open the return, run the engine and cycle the steering while keeping the resevoir topped off with ATF. That should purge the system, but I'm not sure that's nessessary.
Does anyone know what will happen if you put motor oil in place of ATF in one these systems? Just trying to figure out if that is infact what I did. I've heard mention here that AFT and motor oil just won't mix. If that's the case, I think I'd have some serious power steering issues.