MCI Radiator Fan Gear Boxes for different models?

[Tenor]

Is there any difference between the gear boxes for MCI squirrel cage fans?  MCI7, MCI8 or MCI9? I know there are different fans, but I can't find a post with that info.  Thanks!!

[brmax]

Yes, one point is some boxes on their 3 outputs use larger style seals. I believe mainly some are bigger outside diameter, and can utilize a double lip seal as the National 470403, as opposed to the CR my covers use. Others on the site can describe better their experience in these boxes.



Floyd

[chessie4905]

Someone with parts manuals for these models could compare part numbers for each. Mainly case and shafts, although case may have been updated for larger seals. You could give Luke a call.

[Tenor]

To follow up, I installed the gearbox from an MCI9 (6v92) into my MCI7 and everything is dimensionally the same.  However, there are some design improvements.  My old gearbox had a fill neck that filled near the bottom rear of the housing.  It also never stood up, but would flop over to either side.  The later design deleted it and put a fill directly into the top lid. On the old design there are two external oil lines to the sight gauge, and they leaked and rubbed. The new has a single (steel?) tube to the sight gauge.  I re-used the original fans and squirrel cages, as I've never had a heat issue.  I did keep the old fans and cages, in case of a future need.