911 motor topic, Fan housing/shroud |
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911 motor topic, Fan housing/shroud |
worn |
Jan 3 2017, 03:06 PM
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#1
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can't remember Group: Members Posts: 3,288 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest |
OK, my tag line says the 911 is out of action and that must change. I have torn apart and rebuit the whole engine but the fan shroud is cracked, seeing as how it is magnesium. I bought a nice used one and it has the same casting number as the old one. But it is different.
In both the support vanes go to a mounting flange for the alternator. The hole the alternator goes into is the same diameter. The difference is the hole that the alternator fits into is deeper in my cracked original and shallower in the new one. PET says there was a change at the 80 year and I have an '80 SC. With the shallower hole the alternator goes in less and the studs for fastening just barely fit through. No room for a nut. Also, I think the fan would be rather out in the shroud. What I am trying to find out is how to get an alternator to fit the thick flange newly purchased shroud. One question is which is newer and which is older. Here is a photo of what Vertex sells (but doesn't make) You can get spacer rings for alternators that normally go with a shroud with a hole that is shallower. Help?! |
mb911 |
Jan 3 2017, 03:33 PM
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#2
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914 Guru Group: Members Posts: 7,159 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest |
I weld these rings all the time I have 10 of them currently from supertec on the bench and a few from rarlyl8 motorsports and a couple clients. Odds are I can fix what you have and considering we are not that far away from you it would be fairly inexpensive..
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worn |
Jan 4 2017, 10:41 AM
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#3
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can't remember Group: Members Posts: 3,288 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest |
I weld these rings all the time I have 10 of them currently from supertec on the bench and a few from rarlyl8 motorsports and a couple clients. Odds are I can fix what you have and considering we are not that far away from you it would be fairly inexpensive.. Yeah. Sounds like you could. I am leaving town for a week and then I will get back to you. We should have met up long ago. Still would like to know for sure which alternator goes with the deep recess and more to the current dilemma which goes with the shallow. I tend to believe Mark, but he didn't sound certain. Posted this on Reenlist and got nothing. Here in the world I got instant help!! |
Mark Henry |
Jan 4 2017, 12:40 PM
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#4
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
I tend to believe Mark, but he didn't sound certain. They also crack all around the alt bolt mounting holes. The fans themself oval out the holes where the steel pulley rivets to the fan, be sure to check that as well. Looks like I was right, just didn't want you buying anything without double checking. An original /6 would have the 1969-74 shallow housing with coil mount studs and a 55amp alt. 1968 and earlier have no coil mount bolts. '75 till mid 80's had the deep housing and the 70 amp alt. On some of these there is a half moon cutout on the edge, near the timing mark, for the bigger pulley. Some of these alt's suffered from the big nut treads being damaged. I have a full assembly (ring, alt fan and pulley) of each, I'm going with the 70 amp external regulator alt. |
worn |
Jan 4 2017, 01:12 PM
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#5
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can't remember Group: Members Posts: 3,288 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest |
I tend to believe Mark, but he didn't sound certain. They also crack all around the alt bolt mounting holes. The fans themself oval out the holes where the steel pulley rivets to the fan, be sure to check that as well. Looks like I was right, just didn't want you buying anything without double checking. An original /6 would have the 1969-74 shallow housing with coil mount studs and a 55amp alt. 1968 and earlier have no coil mount bolts. '75 till mid 80's had the deep housing and the 70 amp alt. On some of these there is a half moon cutout on the edge, near the timing mark, for the bigger pulley. Some of these alt's suffered from the big nut treads being damaged. I have a full assembly (ring, alt fan and pulley) of each, I'm going with the 70 amp external regulator alt. Yeah, I have the moon cutout on the original along with the other cracks you mentioned. Prefer the external regulator for obvious reasons. More wires but easier to diagnose and fix. |
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