clutch fans ?
Thread Starter
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Freshman User
Joined: May 2004
Posts: 29
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From: lompoc ca,
clutch fans ?
Hello All,
Wondering, I have a 1977 C-Class with a 460, 24' In stop n go traffic and climbing grades the temp appears to go up, I have replaced thermostat checked hoses & flushed the radiator, Could it be the clutch fan, How would one go about checking it out, The motor has around 70K miles on it,
Had to take it in for the dreadful Calif. smog and the tech said it started running hot after running at 2500 rpm's for a while,
Any thoughts ???
Thanks
Wondering, I have a 1977 C-Class with a 460, 24' In stop n go traffic and climbing grades the temp appears to go up, I have replaced thermostat checked hoses & flushed the radiator, Could it be the clutch fan, How would one go about checking it out, The motor has around 70K miles on it,
Had to take it in for the dreadful Calif. smog and the tech said it started running hot after running at 2500 rpm's for a while,
Any thoughts ???
Thanks
Elder User
Joined: Jan 2004
Posts: 767
Likes: 1
From: Franklin, GA
There's a long list of what it could be, but to check the fan clutch you shouldn't be able to spin it by hand one revolution if it is a fluid clutch. You should feel the resistance. The thermal spring clutch should be noticable when it engages and disengaged when the engine temp gets up. You should also be able to see the spring in front and tell if it is broken.
Miscelaneous item to check: Coolant condition check, fan belt tension, clogged radiator (I know you said you flushed it), radiator cap (pressure check it), timing set properly, carb running lean, and last but not least--fan shroud!
Miscelaneous item to check: Coolant condition check, fan belt tension, clogged radiator (I know you said you flushed it), radiator cap (pressure check it), timing set properly, carb running lean, and last but not least--fan shroud!
Thread Starter
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Freshman User
Joined: May 2004
Posts: 29
Likes: 0
From: lompoc ca,
re:
Thanks,
All mentioned has been checked, The tech that is performing the smog check said that the timming was a little advanced,
So ya mean if I take the fan and spin it like say a pin wheel it shouldn't rotate more than 360 deg. ?
Thanks,
All mentioned has been checked, The tech that is performing the smog check said that the timming was a little advanced,
So ya mean if I take the fan and spin it like say a pin wheel it shouldn't rotate more than 360 deg. ?
Thanks,
Elder User
Joined: Jan 2004
Posts: 767
Likes: 1
From: Franklin, GA
Yeah, if it is a fluid clutch that's in good condition, you shouldn't be able to "pin wheel" it more than three or four fan blades past the starting point. I just put one on a Jeep CJ5 and it doesn't spin two blades past the starting point. Almost stops as soon as my fingers leave the blade.
Tuned
Joined: Feb 2003
Posts: 495
Likes: 0
From: Cincinnati, Ohio
How much does it go up? Definitely do as hdgapeach said about checking the fan clutch but E-Series vans run hotter because of the lack of air movement through the engine compartment. You can verify this by unlatching your hood and let it ride on the safety hook and see what that does to your temps. I used to put a spring on an E-250 460 van to prop the hood open when towing to get more air circulation and that made a significant difference in temperature.
John
John
