One of our members was having issues keeping the fan belt on the pulley. I used an old trick of turning it around. Now it stays where it belongs.
Cheap fix to a frustrating problem. I forgot who told me KISS just might solve your problem.
I forget the technical reason why this works. Some sort of flaw in the manufacturing process
that makes one side of the belt tighter or smaller than the other side.
Fan belt won't stay on the pulley
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Allan
- Posts: 6729
- Joined: Sun Jan 06, 2019 7:21 pm
- First Name: Allan
- Last Name: Bennett
- * REQUIRED* Type and Year of Model Ts owned: 1912 van, 1917 shooting brake, 1929 roadster buckboard, 1924 tourer, 1925 barn find buckboard, 1925 D &F wide body roadster, 1927LHD Tudor sedan.
- Location: Gawler, Australia
Re: Fan belt won't stay on the pulley
Mis-aligned pulleys can stretch one side of a flat fan belt, rather than it being a manufacturing fault. This happens more often on the cars with the longer fan arm. The remedy is to check and possibly reset the fan arm so the fan shaft is parallel to the crankshaft.
Allan from down under.
Allan from down under.
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Jerry VanOoteghem
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- Location: S.E. Michigan
Re: Fan belt won't stay on the pulley
100% ^^^Allan wrote: ↑Fri Aug 15, 2025 9:13 pmMis-aligned pulleys can stretch one side of a flat fan belt, rather than it being a manufacturing fault. This happens more often on the cars with the longer fan arm. The remedy is to check and possibly reset the fan arm so the fan shaft is parallel to the crankshaft.
Allan from down under.
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TXGOAT2
- Posts: 7581
- Joined: Sun Feb 14, 2021 10:08 pm
- First Name: Pat
- Last Name: McNallen
- * REQUIRED* Type and Year of Model Ts owned: 1926-7 roadster
- Location: Graham, Texas
- Board Member Since: 2021
Re: Fan belt won't stay on the pulley
It's difficult to keep a belt on misaligned pulleys or pulleys with the crown worn flat.