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Old 12-05-2017, 05:37 PM   #1
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Engine fan

Does it spin all the time or is it on a clutch controlled by engine temp
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Old 12-05-2017, 05:51 PM   #2
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Does it spin all the time or is it on a clutch controlled by engine temp

most all the busses since the late 80s have clutch fans.. some are viscous type clutches where the fan spins a minimum (usually 300-400 RPM) all the time.. and then slowly engages via a mechanical thermal coil on the front of the clutch if the radiator heats up..

fancier busses have an electric clutch .. then fan spins very slowly all the time.. and then when the engine reaches a set temperature the fan cluch snaps-in and the fan runs full speed..

the electric or air clutches will have wires and / ir an air line going up near the fan. the viscous clutches will be aluminum or gold colored and have fins around the hub..
-Christopher
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Old 12-05-2017, 08:59 PM   #3
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Mine not spinning at all any thoughts
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Old 12-05-2017, 09:23 PM   #4
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Generally speaking, that's not good. And you're dealing with an FE. I can't see my fan clutch either.

Do you ever get the temperature up near 210? Mine takes a pretty long hill before the fan comes on.
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Old 12-05-2017, 10:22 PM   #5
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Mine not spinning at all any thoughts
it doesnt even slowly rotate when the engine is on? is the belt on the pulley? you should get a slow rotation all the time just from bearing resistance..

-Christopher
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Old 12-05-2017, 11:02 PM   #6
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I never heard the fan in mine for months after I bought it. I had to run it to the top of a mountain before the fan finally kicked on. It hit real hard like it had been stuck and scared the carp out of me.

I've got a question about the fan clutches. Do they come on at different speeds, like low/medium/high, or just on/off? Sometimes it sounds like it's running at a lower speed, but that first time it came on with a bang.
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Old 12-06-2017, 03:51 AM   #7
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I never heard the fan in mine for months after I bought it. I had to run it to the top of a mountain before the fan finally kicked on. It hit real hard like it had been stuck and scared the carp out of me.

I've got a question about the fan clutches. Do they come on at different speeds, like low/medium/high, or just on/off? Sometimes it sounds like it's running at a lower speed, but that first time it came on with a bang.
On my bus, the fan either spins lazily, or engages at full speed. It's some sort of viscous clutch, so it "spools up" and releases somewhat gradually.

On my truck (and many big trucks, for that matter) uses an electric clutch, so it kicks in quickly. Some fans will even "chirp" the belt as they engage.

I understand there are viscous fan clutches that will spin at various speeds, depending what the air temperature is (and that means the air temp going past the clutch, not the outside temp.)
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Old 12-06-2017, 08:28 AM   #8
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My bus has a hydraulic motor that runs the fan. Since I can't hear it and the motor doesn't overheat I assume that it comes on. I've never actually seen it run other than at start up.

My semis all had air operated fan clutches. Fan is pretty much instant on. My first truck controlled the AC head pressure by turning the fan on and off. If that thing came on during a gear change I guarantee a missed shift.
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Old 12-06-2017, 08:36 AM   #9
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my DRV bus has the viscous clutch .. that clutch has a Minimum speed of 300 RPM.. my red bus has the electric horton.. which Chirps the belt when it kicks in. one of my threads I chronicled the installation of it so you can see what it looks like.. I also did a youtube video of how to Clock (adjust the temp) of a viscous fan clutch..

the air driven clutches are pretty common on trucks and some busses. the air engagement is a little less harsh on the belt.. that "chirp" is hard on the belt.

ive only ever seen a hydraulic fan in a rear engine application where the fan is installed on the side of the engine bay and the engine is Longitude mounted.. the rear engine hydraulic motors are typically 2 speed so you wont hear your fan unless you engage high speed which is usually when working the engine hard.. ie climbing a hill. otherwise the fan speed runs on low and is enough to cool the engine.

-Christopher
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Old 12-06-2017, 11:26 AM   #10
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My fan clutch seems to be working fine since that first time it came on so hard. I can't see the fan in this FE so I don't know what kind of clutch it has.

It does turn on when the coolant gets about 205 or 210, but it takes a pretty hot summer day or a very long hill to get the engine that warm. I can count the number of times my fan has turned on on one hand over the past two years.

I may not be able to see my fan clutch, but it is working. Thanks for the edification.

That brings me to another question. How do people change the fan belts on a FE?
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