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john d
10-24-2005 21:28:12
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Re: Fan Belt Adjustment On M in reply to Paul in WI, 10-24-2005 18:19:45
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The adjustment is by means of a threaded sheave on one side of the pulley located on the fan hub. Look closely at that pulley, and you'll see threads on the front portion of the hub. You'll also find a set screw with a locking nut on it. Loosen the nut, then remove the set screw. Actually you don't have to totally remove it, but....it may have been 20-30 years since that pulley's been adjusted. My advice is to remove it totally. Spray some good penetrating oil into the hole where the set screw had been, and turn it up on top so the oil can start working on the threads. If you have a wire brush, clean the threads in front of the pulley. If you don't have a wire brush, use an old toothbrush and some carb cleaner or more penetrating oil. When the threads look pretty clean, use a long punch and a hammer to TAP on the raised boss opposite where you removed the set screw. Tap it one way for a while, then the other way, until it starts to turn. (Note: do NOT CLOBBER THAT HUB AND BREAK IT!) Patience is required in this adventure!
Once the hub has been cleaned and loosened until it will turn freely on those threads by hand, you're ready to put on a new belt, tighten the hub, and re-install the set screw. Don't forget the lock nut! The end of the set screw is supposed to go into the groove machined into the threaded portion. I replaced the one my '49 M a couple of years ago, and it took me well over an hour to get it all cleaned, loose, and put back together. It's amazing how much dirt can lodge in those threads!
The belt does not have to be extremely tight to work well. A similar system is used to tighten the generator belt, with the movable pulley sheave being on the generator.
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