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AC model B with C or CA motor? any help will help

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Rob

04-15-2003 13:38:41

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My brother-in-law and I just purchased a AC tractor at auction for $750. some gentleman told me after the sale that the model B had a C motor in it, and that it had the bolt holes for the generator. now my question is can a starter be added to this unit? did AC use a dual starter/generator or is there another way, the motor has a magneto and after we checked every thing over with some fresh gas it ran quite well, I believe the auctioneer thought it would never run in it's condition. but I am new to AC's and need help on where to go from here, when you start them do you open the valve above the carburater to relieve the high compression?? like JD's? because when I didn't it kicked back HARD while cranking it. well anybodies 2 cents will be greatly accepted and point us in the right direction.
Thanks

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CHALMERSBOB

04-16-2003 18:39:46

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Re: AC model B with C or CA motor? any help will help in reply to Rob, 04-15-2003 13:38:41

THA ENGINE SERIAL # OF THE B ENGINE IS ON THE BLOCK IN THE CENTER ABOVE THE FLYWHEEL, BETWEEN THE FUEL BOWL AND THE AIR CLEANER IT WILL START WITH "BE".
THE SERIAL # FOR THE "C" ENGINE IS VISIBLE JUST BEHIND THE AIR CLEANER ON THE SIDE OF THE BLOCK. IT WILL START WITH "CE". IF THE SERIAL # STARTS WITH "CR", IT IS AN ENGINE OFF OF A COMBINE OR BALER. THIS WOULD BE THE SAME ENGINE AS A "C" NO, ALLIS DIDN'T USE A GEN/STARTER. THE STARTER IS MOUNTED ON THE RIGHT SIDE OF THE ENGINE THROUGH THE BELL HOUSING.
A "C" ENGINE COULD HAVE A RING GEAR ON IT, BUT A "CR" PROBABLY WILL NOT.
TO ADD A STARTER WITHOUT A STARTER HOLE IN THE BELL HOUSING, YOU WILL HAVE TO CHANGE THE HOUSING
ITS A GREAT LITTLE TRACTOR, I HAVE 3 OF THEM, HAVE FUN WORKING ON IT. GLAD TO HELP ANY WAY I CAN.
BOB

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Tyler(WA)

04-16-2003 09:32:06

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Re: AC model B with C or CA motor? any help will help in reply to Rob, 04-15-2003 13:38:41

If it's kicking back, you need to set the timing.

Easy method is to pre-crank it so it just fired on #3. Loosen the mag and lean it over as far counter clockwise as you can get it. The top should be close to touching the block. Then have a friend slowly crank it to TDC on #1. On the left side of the bell housing (carberator side) there is a hole that lets you see the edge of the flywheel. As your helper slowly cranks it to TDC, watch for the FIRE mark on the flywheel. This can be a very faint mark so look closely and you may want to clean the flywheel first, so you can see it better. The FIRE mark also usually has three faint horizontal lines under it. Get the FIRE mark center in the viewing hole and go back to the mag that's leaned over agaist the block. Slowly rotate the mag back clockwise until you hear the impulse fire. Tighten down the adjusting clamps. This method will set the timing as well as most timing lights.

You can also use a timing light and a spare battery for power. Just adjust the mag so the FIRE mark is center in the viewing port.

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wdTom

04-15-2003 18:24:44

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Re: AC model B with C or CA motor? any help will help in reply to Rob, 04-15-2003 13:38:41

I don't think I know about a valve above the carb. Anyway, if it is tuned up right, it should start readily with a crank, just a few pulls normally I think. The ones I have delt with have been electric start, but when I have ended up cranking it hasn't been a big deal to get them running. If you are going to know what you are doing, get a set of manuals, repair and owners. And ask more questions here.

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Dave Wi.

04-15-2003 18:45:32

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Re: Re: AC model B with C or CA motor? any help will help in reply to wdTom, 04-15-2003 18:24:44

We had aWD with the valve on the maifold,its not compression releif,its vacume that we used on the milker if power was out.

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steve

04-15-2003 16:00:09

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Re: AC model B with C or CA motor? any help will help in reply to Rob, 04-15-2003 13:38:41

AC never made a starter to belt drive on the front with the generator. You need a different bell housing (torque tube) with the "hole" for the starter, then you need the flywheel with the teeth on it, then a battery. It is normally cheaper to get a different tracotr, unless you run across the parts at a junk yard. Also saw a unit once that had starter setup on the PTO shaft and drove backward thru trans top shaft to turn the crank. Might be easier to just make a nice little crank tractor and then look for another that is battery start.

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