Home » Public Forums » GMCnet » Not another fan clutch
| Not another fan clutch [message #247134] |
Fri, 11 April 2014 16:27  |
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SeanKidd
Messages: 747
Registered: June 2012
Location: Northern Neck Virginia
Karma: 4
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Ok, CFO asks, all this talk about fan clutches, how's ours...knocked wood didn't help.
Viscous coupling works, speeds up with engine start, slows down right after start...sounded like chirping, perhaps something hitting a blade, irregular rhythm.
Shut it down, reach in and turn blade by hand, no interference but notice some wiggle at the clutch...I'll have a new 15-4644 in the morning.
Maintenance manual says, remove seal retainer, roll back seal toward shroud, remove fan, blah blah...my seal retainer looks like it won't come out in one piece, looks, crunchy, rust. Is this something I ca just replace with metal strapping or something.
Sean and Stephanie
73 Ex-CanyonLands 26' #317 "Oliver"
Hubler 1-Ton, Quad-Bags, Rear Disc, Reaction Arms, P.Huber TBs, 3.70:1 LSD Honda 6500 inverter gen.
Colonial Travelers
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| Re: Not another fan clutch [message #247135 is a reply to message #247134] |
Fri, 11 April 2014 16:58  |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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| SeanKidd wrote on Fri, 11 April 2014 14:27 |
Ok, CFO asks, all this talk about fan clutches, how's ours...knocked wood didn't help.
Viscous coupling works, speeds up with engine start, slows down right after start...sounded like chirping, perhaps something hitting a blade, irregular rhythm.
Shut it down, reach in and turn blade by hand, no interference but notice some wiggle at the clutch...I'll have a new 15-4644 in the morning.
Maintenance manual says, remove seal retainer, roll back seal toward shroud, remove fan, blah blah...my seal retainer looks like it won't come out in one piece, looks, crunchy, rust. Is this something I ca just replace with metal strapping or something.
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If your budget allows, the best thing to replace it with is a new two piece fan shroud:
http://www.appliedgmc.com/prod.itml/icOid/584
It will make future work on the front of engine much easier, especially the bottom.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: Not another fan clutch [message #247136 is a reply to message #247134] |
Fri, 11 April 2014 17:02 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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Sir: I remove the 4 bolts that hold the fan blade to the clutch then remove the 4 nuts that hold the clutch on the water pump. Remove the clutch and leave the fan blade in the shroud. Install in reverse order. You should not have to loosen the belts if you are careful.
| SeanKidd wrote on Fri, 11 April 2014 17:27 |
Ok, CFO asks, all this talk about fan clutches, how's ours...knocked wood didn't help.
Viscous coupling works, speeds up with engine start, slows down right after start...sounded like chirping, perhaps something hitting a blade, irregular rhythm.
Shut it down, reach in and turn blade by hand, no interference but notice some wiggle at the clutch...I'll have a new 15-4644 in the morning.
Maintenance manual says, remove seal retainer, roll back seal toward shroud, remove fan, blah blah...my seal retainer looks like it won't come out in one piece, looks, crunchy, rust. Is this something I ca just replace with metal strapping or something.
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C. Boyd
76 Crestmont
East Tennessee
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| Re: Not another fan clutch [message #247137 is a reply to message #247134] |
Fri, 11 April 2014 17:06 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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If you like noise, you are going to love that 15-4644 clutch. I had one once, luckily the place I bought it took it back for refund. Then Delco Engineering sent me a free correct replacement one.
The Delco engineer said that clutch is for a 2" longer and 1//2" deeper pitch blade. Check the condition and especially the width of your belts while you are in there. The Delco Engineer I worked with on mine said the minimum spec on that 15-4644 clutch was two 1/2" wide belts. We have 7/16" belts. Many GMC people run them on their GMCs, so they do work.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Not another fan clutch [message #247138 is a reply to message #247136] |
Fri, 11 April 2014 17:07 |
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SeanKidd
Messages: 747
Registered: June 2012
Location: Northern Neck Virginia
Karma: 4
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Senior Member |
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| C Boyd wrote on Fri, 11 April 2014 18:02 |
Sir: I remove the 4 bolts that hold the fan blade to the clutch then remove the 4 nuts that hold the clutch on the water pump. Remove the clutch and leave the fan blade in the shroud. Install in reverse order. You should not have to loosen the belts if you are careful.
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Perfect, that what I was wondering. I kind of did that when I removed my engine through the top...
Sean and Stephanie
73 Ex-CanyonLands 26' #317 "Oliver"
Hubler 1-Ton, Quad-Bags, Rear Disc, Reaction Arms, P.Huber TBs, 3.70:1 LSD Honda 6500 inverter gen.
Colonial Travelers
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