Fan pulley bolts - what torque?
#1
Seared
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Fan pulley bolts - what torque?
I'm in the process of installing the new belts after getting the alternator, fan and housing reinstalled. I've had the three hex bolts on & off a few times as I determine the best tension. Unfortunately I'm a bit shaky on the correct torque measurement for the three bolts. My shop manual states 50 Nm (36.8 ftlbs) which in my opinion is far too tight for these small bolts.
Does anyone know the correct torque? The last thing I want to do is shear one of the bolts off within the new fan hub!
Andreas
Does anyone know the correct torque? The last thing I want to do is shear one of the bolts off within the new fan hub!
Andreas
Last edited by AOW162435; 02-17-2008 at 09:01 PM.
#3
Seared
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Garth,
Thank you! Geez-o-wiz. I should scan the page in the shop manual that states 50 Nm.
Since the three bolts are working against the friction of the belt that is slowly riding up the pulley halves, how does one accurately measure this torque?
The Clewitt Engineering flat belt setup is looking more appealing by the minute....
Andreas
Thank you! Geez-o-wiz. I should scan the page in the shop manual that states 50 Nm.
Since the three bolts are working against the friction of the belt that is slowly riding up the pulley halves, how does one accurately measure this torque?
The Clewitt Engineering flat belt setup is looking more appealing by the minute....
Andreas
#4
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I think the 50nm figure is for the main pulley nut. I looked everywhere in the service manual for a torque figure for those three allen bolts for ya -- I couldnt find them anywhere.
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Andreas
There appears to be some dirt like substance on 1) the one boss for the mounting bold at the arrow and also 2) on the leading edge of the one fan vane. Both of those could cause either an imbalance of the fan itself (dirt on the vane) or improper seating of the bolt when you torque it.
Glad I could help.
Bill
There appears to be some dirt like substance on 1) the one boss for the mounting bold at the arrow and also 2) on the leading edge of the one fan vane. Both of those could cause either an imbalance of the fan itself (dirt on the vane) or improper seating of the bolt when you torque it.
Glad I could help.
Bill
#6
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Andreas
There appears to be some dirt like substance on 1) the one boss for the mounting bold at the arrow and also 2) on the leading edge of the one fan vane. Both of those could cause either an imbalance of the fan itself (dirt on the vane) or improper seating of the bolt when you torque it.
Glad I could help.
Bill
There appears to be some dirt like substance on 1) the one boss for the mounting bold at the arrow and also 2) on the leading edge of the one fan vane. Both of those could cause either an imbalance of the fan itself (dirt on the vane) or improper seating of the bolt when you torque it.
Glad I could help.
Bill
I greatly appreciate your vigilance. I've inspected the surfaces you mentioned and have concluded that both are products of sub-standard photography on my part.
The pulley mounting surface was carefully cleaned with fine emory cloth (a granular mineral substance consisting typically of corundum mixed with magnetite or hematite, used powdered, crushed, or consolidated for grinding and polishing), and the fan blades are truly surgery-suite clean. No foreign matter there.
Andreas
#7
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Maybe a
GB on the CLewett!?!?!?[
QUOTE=AOW162435;5116224]Garth,
Thank you! Geez-o-wiz. I should scan the page in the shop manual that states 50 Nm.
Since the three bolts are working against the friction of the belt that is slowly riding up the pulley halves, how does one accurately measure this torque?
The Clewitt Engineering flat belt setup is looking more appealing by the minute....
Andreas[/QUOTE]
GB on the CLewett!?!?!?[
QUOTE=AOW162435;5116224]Garth,
Thank you! Geez-o-wiz. I should scan the page in the shop manual that states 50 Nm.
Since the three bolts are working against the friction of the belt that is slowly riding up the pulley halves, how does one accurately measure this torque?
The Clewitt Engineering flat belt setup is looking more appealing by the minute....
Andreas[/QUOTE]
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Bill,
I greatly appreciate your vigilance. I've inspected the surfaces you mentioned and have concluded that both are products of sub-standard photography on my part.
The pulley mounting surface was carefully cleaned with fine emory cloth (a granular mineral substance consisting typically of corundum mixed with magnetite or hematite, used powdered, crushed, or consolidated for grinding and polishing), and the fan blades are truly surgery-suite clean. No foreign matter there.
Andreas
I greatly appreciate your vigilance. I've inspected the surfaces you mentioned and have concluded that both are products of sub-standard photography on my part.
The pulley mounting surface was carefully cleaned with fine emory cloth (a granular mineral substance consisting typically of corundum mixed with magnetite or hematite, used powdered, crushed, or consolidated for grinding and polishing), and the fan blades are truly surgery-suite clean. No foreign matter there.
Andreas
#11
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Garth,
Thank you! Geez-o-wiz. I should scan the page in the shop manual that states 50 Nm.
Since the three bolts are working against the friction of the belt that is slowly riding up the pulley halves, how does one accurately measure this torque?
The Clewitt Engineering flat belt setup is looking more appealing by the minute....
Andreas
Thank you! Geez-o-wiz. I should scan the page in the shop manual that states 50 Nm.
Since the three bolts are working against the friction of the belt that is slowly riding up the pulley halves, how does one accurately measure this torque?
The Clewitt Engineering flat belt setup is looking more appealing by the minute....
Andreas
The Clewitt set up is nice - but changing out the crank pulley could be a lot of fun
#13
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I think. I looked at Neil's 993 today and realized that his plastic shroud did not fit tight to the fan housing either. My fan pulley is dead in line with the crank pulley and everything looks in order, so I'll continue getting it reassembled.
Andreas
Andreas