I know there IS a trick but I do not know what it is.
So what is the trick to tightening the fan belt on my 1926? I know the fan rides in a hub but I can only get it to move "just so far" and the fan belt is still quite loose.
I've tried a variety of "prying tools" but getting a purchase anywhere is difficult.
Loosen fan shaft nut then you could use a medium length screwdriver to pry between the raised square boss and the fan shaft nut to turn in the direction you need to tighten belt. ... then tighten fan shaft nut
John, use a 1/2" open end wrench on the square lug and it should move both ways, check the length of your fanbelt,wrap a string around both pulleys and then measure and the closest to your measurement is the correct belt. You may also want to remove the fan shaft and clean the part that turns as they sometimes get rusty and don't want to turn. Good luck.
Loosen fan shaft nut then you could use a medium length screwdriver to pry between the raised square boss and the fan shaft nut to turn in the direction you need to tighten belt. ... then tighten fan shaft nut...
So belt tightens AWAY from the timer side!
Early 26 units had the locking bolt and nut at the bottom to clamp the cam. Does yours? On the pass side there is also a 3/32" hole to ad some oil to ease rolling the cam. I use an 8" adjustable on mine. It doesn't need to be too tight either. Fan should slip easily by hand. I also have a grease fitting just behind the fan blades on the aluminum mount... add a small shot of grease, tighten the lock nut and have fun! ws
I use a 9/16" or 14mm open end wrench on the square boss and it seems to work well. The belt does not need to be very tight.
Maybe the surface between the eccentric and housing needs cleaned. Does the eccentric rotate freely without the belt?
If you have the early'26 fan adjuster it is different than the later ones, there is no square lug on the back.
You have to loosen the nut on the adjuster bolt and then turn the bolt one way or the other to adjust the position of the pulley.
When you retighten the nut, DO NOT OVERTIGHTEN IT, else you will break the cast iron carrier, which is part of the water outlet.
As Jim T. said "The belt does not need to be very tight."
Ken is correct, it depends on what style of adjuster you have.
Here is the other from
If you have the one with the square part for adjustment, loosen the nut and take the 1/2 inch wrench and move downward on the square. That will tighten the belt in the direction away from the timer. I leave my belt loose enough that I can spin the fan when the engine is not running. I tighten it just enough that when the engine is running it will move the fan, but when I turn off the engine the fan keeps on spinning. This way the belt does not run off the pulleys. You might not have that problem, but mine has a ball bearing hub on the fan and unfortunately it is just a fraction of an inch too far forward so the belt keeps running off. With the belt loose, it hasn't run off. Note I have a leather belt with stitching along the edges. It might be different with a different kind of belt.
Gents, and Jim Thode,
I have the kind Jim has referred to and WALLA!!! It is fixed!
As usual, the technical assistance here is priceless.
Thanks Folks and MTCFA.