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Fan Hub


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Question two for the day. Winterizing my truck today so went to Speedco for PM. Technician questioned me about a sound he heard which he thought could be a loose fan hub. Can't say my old ears heard what he heard but could not see "wiggle" with motor running or any significant movement with engine shut down when moved by hand. What would I be looking for if there were a problem?

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Try to watch the hub when it is disengaged. The fan may be spinning, but at a slower rate.

 

When the hub is engaged, the spring pressure of the hub clutch may camouflage any wobble in the hub.

 

A bearing failure in the hub can cause the disconnected fan taking out the radiator, heat exchanger and hood.

Spoke to my Volvo dealer. Shop has been pretty fair with me in the past. He said I could plug and unplug solenoid on frame rail after air built up and that would engage and disengage clutch. The truck is not overheating and I could hear fan engage/disengage on return trip from Hutch. Service guy said if not overheating and would engage/disengage unlikely to be bad fan clutch or hub. Any question and I'll just take it in but replacement estimate $1200-1500. Don't want to spend money I don't have to.

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Guest THE TRAILERKING

The clutch may be working by the bearing might be going.

Yes for sure. When the engine is stopped and the fan hub free-wheeling get in there and grab it. There shouldn't be any play when trying to wobble the fan blade. Then spin the fan by hand and it should be smooth with no bearing noise. Very simple to check over. If it is bad, not only will you have to repair/replace the fan hub but may have to replace a lot more if it comes unglued and goes through the rad.

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Yes for sure. When the engine is stopped and the fan hub free-wheeling get in there and grab it. There shouldn't be any play when trying to wobble the fan blade. Then spin the fan by hand and it should be smooth with no bearing noise. Very simple to check over. If it is bad, not only will you have to repair/replace the fan hub but may have to replace a lot more if it comes unglued and goes through the rad.

Thanks for the help

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Guest THE TRAILERKING

If still hearing something it could be an alternator bearing, water pump bearing, or even A/C bearing. Lots going on in front of the engine.

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If still hearing something it could be an alternator bearing, water pump bearing, or even A/C bearing. Lots going on in front of the engine.

Will keep listening for any unusual sounds. As I said, couldn't hear anything different than I ve always heard and nothing sounded unusual. 2,000 mile trip to and from Hutch went without problems.

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I think the tech heard a "Ca-CHING!" noise. They tried to sell Mark Bruss a fan clutch for a bunch of $, all it was is a thermostat. His was stuck "ON". Fan clutches generate more revenue than thermostats.

Haha, understand. However, this was a Speedco tech not a dealers shop. Nothing but oil changes and lubes there.

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Using the word "technician" and Speedco in the same sentence is a real stretch. I barely trust them to drain the oil, remove and spin on new filters.

I don't allow them to touch anything else. But your method of checking with the hub free wheeling, no play or bearing noise is fine. I just replaced my Horton on this Freightliner with 1.6 million on the hub. Reman cost $750, with a $700 core charge. They really wanted that one back.

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