MCI cooling upgrade

[Iver]

Uh,  What are speedy sleeves?
Just curious.
    Iver.

[JackConrad]

Uh,  What are speedy sleeves?
Just curious.
    Iver.

Speedy sleeves are sleeves that are installed on the blower shaft to give you a new surface for the seal to ride on (it takes a different seal because of the new shaft diameter)

Were did you get your smaller pulley from? What was the cost? Are you sure that it does not do any damage ruining everything at a faster rate?
Thanks
John

Not sure if he still has any, but at one time Fred Hobe had some smaller pulleys and the shorter belt to go with it.  Jack

[RickB]

John4104,

The pulley thing is kinda complex. You can certainly buy one from Fred or C&J coach in Minneapolis but they are pretty expensive compared to junkyard prices. I don't know the part #'s offhand but there are actually two different types, there is the obvious smaller diameter pulley  and then there is a pulley that is the same size as OEM for most 9's but it has deeper grooves and accomplishes the same result. Most 102's had this deeper groove pulley and they are pretty readily available at junkyards. Burt at ABC in faribault Minnesota has some of them there.

Then there is the problem of getting it off... power blaster by JB? sprayed on and left for awhile helps and then you need a impact wrench, if it has a belt on it leave it on to get the aircraft nut off and then take it off and keep it for comparison when you size the new belt. Also, you'll need to rent a puller unless you have one. I was only able to find one puller in the area that was wide enough to reach the mounting holes on the front of the pulley. Don't use one of those pullers that goes around the outside of the puller as it will break the pulley alongside the outside edge.

Tighten it up and if it doesn't come and you have it reasonably tight, take a hammer and hit the center pilot shaft of the puller.

I never chaecked with Mohawk to see if they were reasonably priced but the difference of $20 or so used and $150-200 for new was worth the effort for me.

I actually bought the shrouds, the gearbox and the pulley for $75 and gave the guys at C&J the gearbox so they could rebuild it and sell it. As many times as JD , Dan and Fred have helped all of us Minnesota bus nuts it was well worth it.

As far as the earlier post about whether or not the gearbox can take the extra rpm's, MCI switched them on the 102's with nothing but positive results because of the better cooling. I've never read anything that suggest they are exceeding the limits of the gearbox.

I think I read that it makes it spin about 1/3 faster, all I know is you can fix all that stuff but unless you have good seals around the top engine bay door and relatively airtight seals around the radiator you will still struggle with overheating on hot days or long pulls. Since I fixed my system the draw of the air through the radiators will suck a piece of paper out of my hand a foot from the bus.

Rick