Placement of Alternator Fan Rear Duct
06-21-2001, 11:04 AM
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Placement of Alternator Fan Rear Duct
I have another fairly technical question regarding the placement/position of the plastic funnel/duct that fastens to the rear fan housing using 3 nuts on alternator studs. This duct has 'curvy' parts that appears to channel air into the heater blower (large black plastic tubing). If this is true than the placement of these curvy parts are to the left of alternator. My recollection was that these curvy parts point down toward engine heads, however, upon re-installation, the darn alternator and duct position down does not fit. When they point to the left everything fits fine. I want to be sure that I don't mis-direct the air flow. Sorry for the less than technical description but I am trying! 
And dying to get the alternator reinstalled to get back out on the road! Pat
And dying to get the alternator reinstalled to get back out on the road! Pat
06-21-2001, 11:24 AM
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Pat,
When you look at the alternator from the front, as if it's installed, and the hub extension on the back, the metal vanes on the hub extension should point to the left, routing air to the left bank of cylinders 1-2-3. Again, as you're looking at the front of the alternator, the right hand, or longest, piece of metal on the hub extension starts out just shy of 12 o'clock, by the back of the alternator, and works it's way down in between cylinders 2 and 3. The left piece of metal on the hub with the deep curve directs air to cylinder 1.
When you look at the alternator from the front, as if it's installed, and the hub extension on the back, the metal vanes on the hub extension should point to the left, routing air to the left bank of cylinders 1-2-3. Again, as you're looking at the front of the alternator, the right hand, or longest, piece of metal on the hub extension starts out just shy of 12 o'clock, by the back of the alternator, and works it's way down in between cylinders 2 and 3. The left piece of metal on the hub with the deep curve directs air to cylinder 1.
06-22-2001, 04:04 PM
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Thom,
That's interesting. When I replaced my alternator, my hub extension only had one of the two vanes on it (the right hand one). Somewhere along the way the othe piece disappeared. I put a hub extension on that has both metal pieces, and while not having any empirical data, my sense is that the engine is staying cooler during cool to medium temp weather. On warmer days, it goes up to 190 and stays there, as the front valance oil cooler kicks in.
That's interesting. When I replaced my alternator, my hub extension only had one of the two vanes on it (the right hand one). Somewhere along the way the othe piece disappeared. I put a hub extension on that has both metal pieces, and while not having any empirical data, my sense is that the engine is staying cooler during cool to medium temp weather. On warmer days, it goes up to 190 and stays there, as the front valance oil cooler kicks in.
06-22-2001, 06:59 PM
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With my '77 - sans vanes - in 100 degree weather, I'm about 3 or so needle-widths below the 210 mark on the freeway, and 1 needle width or less on surface streets.
Maybe 'cause I'm such a kewel dude...
BTW, Is it me, or is the fan on the carerra cooler worthless? I can't see any difference at all with the fan on or off. I have a manual switch on the dash, where the rear wiper switch should be.
Maybe 'cause I'm such a kewel dude...
BTW, Is it me, or is the fan on the carerra cooler worthless? I can't see any difference at all with the fan on or off. I have a manual switch on the dash, where the rear wiper switch should be.
Originally posted by Bill Gregory:
<STRONG>Thom,
That's interesting. When I replaced my alternator, my hub extension only had one of the two vanes on it (the right hand one). Somewhere along the way the othe piece disappeared. I put a hub extension on that has both metal pieces, and while not having any empirical data, my sense is that the engine is staying cooler during cool to medium temp weather. On warmer days, it goes up to 190 and stays there, as the front valance oil cooler kicks in.</STRONG>
<STRONG>Thom,
That's interesting. When I replaced my alternator, my hub extension only had one of the two vanes on it (the right hand one). Somewhere along the way the othe piece disappeared. I put a hub extension on that has both metal pieces, and while not having any empirical data, my sense is that the engine is staying cooler during cool to medium temp weather. On warmer days, it goes up to 190 and stays there, as the front valance oil cooler kicks in.</STRONG>
