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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#21
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can't remember Group: Members Posts: 3,157 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 4 2017, 05:04 PM
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#22
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914 Guru Group: Members Posts: 6,872 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest |
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mepstein |
Jan 4 2017, 06:21 PM
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#23
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914-6 GT in waiting Group: Members Posts: 19,307 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
I am working with a local foundry to try and reproduce the fan rings.. Might do a bunch of them as there is a big demand for them unlike 10 years ago.. Attached are pictures of one's that can't be fixed or can't be fixed cost effectively.. Make sure you make the Carrara first. That's the one that breaks the most often and is in the highest demand. I paid $500 from vertex but from what I hear they are getting $900 now. There's is aluminum. Their first gen didn't fit well but later versions fit fine. I have one on my 3.2. |
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