SuiteSuccess Posted October 23, 2015 Report Share Posted October 23, 2015 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? 2006 Volvo 780 "Hoss" Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift Bed Build by "JW Morgan's Custom Welding" 2017 DRV 39DBRS3 2013 Smart Passion Coupe "Itty Bitty" "Don't go around saying the world owes you a living. The world owes you nothing. It was here first!" Link to comment Share on other sites More sharing options...
Mark and Dale Bruss Posted October 23, 2015 Report Share Posted October 23, 2015 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. Please click for Emails instead of PM Mark & DaleJoey - 2016 Bounder 33C Tige - 2006 40' Travel SupremeSparky III - 2021 Mustang Mach-e, off the the Road since 2019 Useful HDT Truck, Trailer, and Full-timing Info atwww.dmbruss.com Link to comment Share on other sites More sharing options...
SuiteSuccess Posted October 23, 2015 Author Report Share Posted October 23, 2015 Thanks for the info Mark. 2006 Volvo 780 "Hoss" Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift Bed Build by "JW Morgan's Custom Welding" 2017 DRV 39DBRS3 2013 Smart Passion Coupe "Itty Bitty" "Don't go around saying the world owes you a living. The world owes you nothing. It was here first!" Link to comment Share on other sites More sharing options...
Alie&Jim's Carrilite Posted October 23, 2015 Report Share Posted October 23, 2015 What's this Winterizing you speak of? Jim's Adventures Old Spacecraft.... Who knows whats next Link to comment Share on other sites More sharing options...
SuiteSuccess Posted October 23, 2015 Author Report Share Posted October 23, 2015 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. 2006 Volvo 780 "Hoss" Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift Bed Build by "JW Morgan's Custom Welding" 2017 DRV 39DBRS3 2013 Smart Passion Coupe "Itty Bitty" "Don't go around saying the world owes you a living. The world owes you nothing. It was here first!" Link to comment Share on other sites More sharing options...
Mark and Dale Bruss Posted October 24, 2015 Report Share Posted October 24, 2015 The clutch may be working by the bearing might be going. Please click for Emails instead of PM Mark & DaleJoey - 2016 Bounder 33C Tige - 2006 40' Travel SupremeSparky III - 2021 Mustang Mach-e, off the the Road since 2019 Useful HDT Truck, Trailer, and Full-timing Info atwww.dmbruss.com Link to comment Share on other sites More sharing options...
SuiteSuccess Posted October 24, 2015 Author Report Share Posted October 24, 2015 The clutch may be working by the bearing might be going. Gotcha, thanks. 2006 Volvo 780 "Hoss" Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift Bed Build by "JW Morgan's Custom Welding" 2017 DRV 39DBRS3 2013 Smart Passion Coupe "Itty Bitty" "Don't go around saying the world owes you a living. The world owes you nothing. It was here first!" Link to comment Share on other sites More sharing options...
Guest THE TRAILERKING Posted October 24, 2015 Report Share Posted October 24, 2015 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. Link to comment Share on other sites More sharing options...
SuiteSuccess Posted October 24, 2015 Author Report Share Posted October 24, 2015 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 2006 Volvo 780 "Hoss" Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift Bed Build by "JW Morgan's Custom Welding" 2017 DRV 39DBRS3 2013 Smart Passion Coupe "Itty Bitty" "Don't go around saying the world owes you a living. The world owes you nothing. It was here first!" Link to comment Share on other sites More sharing options...
SuiteSuccess Posted October 24, 2015 Author Report Share Posted October 24, 2015 Mark and TK, Did the checks you suggested. No play at all in the fan, no bearing sounds, fan turns easily, no hub wobble engaged or disengaged. Don't know what the tech was hearing but think all is well. Thanks for the help. 2006 Volvo 780 "Hoss" Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift Bed Build by "JW Morgan's Custom Welding" 2017 DRV 39DBRS3 2013 Smart Passion Coupe "Itty Bitty" "Don't go around saying the world owes you a living. The world owes you nothing. It was here first!" Link to comment Share on other sites More sharing options...
Guest THE TRAILERKING Posted October 24, 2015 Report Share Posted October 24, 2015 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. Link to comment Share on other sites More sharing options...
SuiteSuccess Posted October 24, 2015 Author Report Share Posted October 24, 2015 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. 2006 Volvo 780 "Hoss" Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift Bed Build by "JW Morgan's Custom Welding" 2017 DRV 39DBRS3 2013 Smart Passion Coupe "Itty Bitty" "Don't go around saying the world owes you a living. The world owes you nothing. It was here first!" Link to comment Share on other sites More sharing options...
SIBERNUT Posted October 24, 2015 Report Share Posted October 24, 2015 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. 2000 Volvo 635 A/S, N-14 Cummins"The Phoenix"'03 KA 38KSWB http://s918.photobucket.com/user/sibernut/library/?sort=6&page=1Furkids- Sibe's CH. Sedona & Tseika Link to comment Share on other sites More sharing options...
SuiteSuccess Posted October 24, 2015 Author Report Share Posted October 24, 2015 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. 2006 Volvo 780 "Hoss" Volvo D12, 465hp, 1650 ft/lbs tq., ultrashift Bed Build by "JW Morgan's Custom Welding" 2017 DRV 39DBRS3 2013 Smart Passion Coupe "Itty Bitty" "Don't go around saying the world owes you a living. The world owes you nothing. It was here first!" Link to comment Share on other sites More sharing options...
beyerjf Posted October 25, 2015 Report Share Posted October 25, 2015 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. Jeff Beyer temporarily retired from Trailer Transit 2000 Freightliner Argosy Cabover 2008 Work and Play 34FK Homebase NW Indiana, no longer full time Link to comment Share on other sites More sharing options...
NoDirectionHome Posted October 25, 2015 Report Share Posted October 25, 2015 Reman cost $750, with a $700 core charge Yeah, they drop two new $25 bearings in it and charge $750 as re-manufactured. "There are No Experts, Do the Math!" 2014 Freightliner Cascadia DD16 600hp 1850ft-lb 18spd 3.31 260"wb SpaceCraft S-470 SKP #131740 Link to comment Share on other sites More sharing options...
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