AOW162435

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

Garth S

The general torque applied to M6 bolts/studs ( 10mm nuts) is 6 Nm ....

AOW162435

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

chris walrod

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.

fb47243

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

AOW162435

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

Marlon

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]

AOW162435

Andreas

fb47243

Phew! Thanks for the reply. I can sleep now through the night tonight.

Marlon

Oooo...yeahhhh...!

Garth S

I progressively tighten the three nuts ( RS pulley - but same deal as the 3 allan bolts) while rotating the engine to assure that the belt rides up to max height in the 2 pulley halves: once the shims/belt tension is OK, I verify torque on each nut when at the lowest vertical position to the crank.

The Clewitt set up is nice - but changing out the crank pulley could be a lot of fun

Cactus

Did you figure out the gap situation?

AOW162435

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