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Registered
Join Date: Sep 2003
Location: MI
Posts: 425
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Broken case need opinions
I have attached a few pics of my 77 7R case. The two areas in question are on the front of the block and both house studs for a cover. Is my case shot? I does not appear that there is a structral integrity issue but I really dont know. It looks like I can machine the two areas enough to bolt the cover together so it will not leak, will that make the case weaker and cause a failure? Please look at the photos and let me know if there is a serious issue or if anything can be done to strengthen the case.
Mike    BTW it appears I have figured out my pic posting issues.
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79SC driver 77S targa work in progress 
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06-26-2005, 06:21 PM
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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,077
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proper shop can fix that as good as new
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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06-26-2005, 07:59 PM
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Registered
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I had a two large holes and my case and my local weld specialist just heli-arc welded and it was like knew. It should not be a problem.
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Its easier asking dumb questions than fixing dumb mistakes 1974 Porsche 911 Coupe, RSR Project 1976 Porsche 911 Targa, Black 1986 Porsche 911 Carrera, Black 2006 Porsche Cayenne S, Black |
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06-26-2005, 08:44 PM
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Super Moderator
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Can be welded, just be sure the guy is comfortable and experienced with magnesium!
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Chris ---------------------------------------------- 1996 993 RS Replica 2023 KTM 890 Adventure R 1971 Norton 750 Commando Alcon Brake Kits |
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06-26-2005, 08:59 PM
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Location: MI
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The bummer of it is I do not have the pieces to weld back in, it was like this when I brought it home. Could it be filled in drilled and tapped?
The real issue I see is the cover leaking. There is enough room to make a flat spot and use a nut and bolt to seal the cover. I dont want the thing to crack under heavy load, When I get back I will console a fab guy I know. Mike
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79SC driver 77S targa work in progress
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06-27-2005, 01:55 AM
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Irrationally exuberant
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The housing that the covers the pulley supports the back/fan end of the motor. It isn't a cover in the sense that if you removed it you'd have oil coming out. Are you have oil leak out of the broken hole or something?
-Chris
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'80 911 Nogaro blue Phoenix! '07 BMW 328i 245K miles! http://members.rennlist.org/messinwith911s/ |
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06-27-2005, 03:00 AM
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Registered
Join Date: Sep 2003
Location: MI
Posts: 425
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Chris,
I see what you mean. It covers the bottom pulley and doesnt hold oil, it bolt to the motor mount. This is structral I think I'm screwed. Mike
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79SC driver 77S targa work in progress
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06-27-2005, 03:14 AM
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Wildman Emeritus
Join Date: Feb 2003
Location: Chitown Burbs
Posts: 1,875
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Only screwed in the sense that it will need to be disassembled to be repaired properly. A welder will build the area with material & it will have to be machined flaton the mating surface & will have to be drilled & tapped. I can recommend a magnesium welding source for the welding if you wish, PM me.
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Mike Andrew 1980 SCWDP 2024 Suby Forester 2018 BMW X1- Wife's 2000 Boxter - Sold |
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06-27-2005, 03:56 AM
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Registered
Join Date: May 2005
Location: Bothell, WA
Posts: 239
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CindyDuck,
When I bought my 1975, the same bolts holding the engine mount to the case were loose, and two had broken off in the case. This is a typical sign, and a typical location of the studs pulling the threads out of the engine case. Rex
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1975 911s 1997 Saab 900s |
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06-27-2005, 04:09 AM
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1970 Porsche 911 S 
The Blue Pheonix
