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Fan clutch
Question for fan clutch change on xll with side by side radiator charge air cooler did you remove the radiator and how difficult was the job.
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8 Replies
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On clutches I have replaced there was a series of bolts that secured the fan to the clutch. I tipped the clutch mount towards the engine (away from the radiator) to make it easier to loosen and remove those bolts. Then I carefully leaned the fan against the radiator and removed 4 bolts holding the clutch assembly to the frame so the clutch could be lifted out.
It has been so long I am sure i am forgetting something, but the principle described is correct.
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Thats the same principle i have used Jon, however my fan has 6 bolts retaining it to fan hub assy, the bolts are flat headed and appear to be of a taper seat design, they turn when undoing the outer nut, as there is no way to hold the inner end, new studs are available from Prevost i will order them up today if not a stock item,
Prevost have 3 different clutch hub units in stock depending on VIN number, mine is available, going to collect today
What would you say is the average life of the fan clutch units ?
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Don’t get me started on fan clutch life.
With the exception of my first coach that had radiator shutters instead of a fan clutch I have replaced at least one in each of my other two coaches. My air dryer has a longer life than the fan clutch. My engine coolant has a longer life than my fan clutch. The flies that come in when we open the door live longer.
I’ve had tires last longer.
Based on my two coach experience which is a poor sample size, I bet my average is 100,000 miles.
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Installed new fan clutch assy today, my old unit has been upgraded at least 6 times according to Prevost so its a survivor, bearings are still good and high speed still locks up
MY original post requesting info was self explanatory on removal of old unit, later fan units have 6 bolts threaded into hub to retain the fan, this old unit has 6 nuts that retain the fan to the hub, the studs are off a taper seat design and cannot be accessed from the rear to prevent from turning,
This required removal of fan and clutch unit together, one off a small tack weld on the back of the taper seats allowed removal of the nuts.
4 mounting studs for fan clutch to support frame required enlarging to mount the new assy, otherwise all dimensions remain the same.
Rebuild is then as per later units with fan in radiator shroud
Fan Clutch assy controlled by Thermostatic switch in top Radiator pipe from engine to radiator, low speed on at 185 deg, high speed on at 199 deg
DDEC 111 prior to relay activated system
Be interesting to monitor life of this later unit, old one will be going into bay as standby
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Make sure the larger diameter of the new clutch pulley does not make the serpentine belt contact anything on the clutch support.
When my last clutch was replaced the belt rubbed against the clutch support housing, and despite what I was told, Prevost did not issue a service bulletin to describe how some grinding of metal was required to provide belt clearance.
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Hello Jon – did you change the clutch yourself? Did you remove the radiator? I have not yet found any tips or YouTube videos on how to do it, and I now have to change mine and pretty quickly as have out of state trip coming up in about three weeks. THANK YOU for any details you can share.
“Make sure the larger diameter of the new clutch pulley does not make the serpentine belt contact anything on the clutch support.
When my last clutch was replaced the belt rubbed against the clutch support housing, and despite what I was told, Prevost did not issue a service bulletin to describe how some grinding of metal was required to provide belt clearance.”
Jon and Di 2006 Liberty Elegant Lady, -
Keep in mind this response relates to X series chassis, and OTR equipped coaches.
I replaced the fan clutch on my 97 myself and the clutch on my 06 was changed by ETLC because it is deeper into the engine area and removing it exceeded my desire to lift it with my arms extended.
Both were replaced with the radiator in place. The procedure is actually fast and simple if you are capable of holding the full weight of the clutch with your arms fully extended. Just thinking about that now makes my back hurt.
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THANK YOU, Jon
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