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Join Date: Mar 2004
Location: Windsor, CT
Posts: 2,119
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Yes that is one of them. The small chamfer on the case holes compliment the washer'a chamfer. They provide a good shaped feature for the orings to fit into.
As I found, one side was chamfered from the factory, the other wasn't. Go figure! They must have been in the process of converting over. |
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02-14-2016, 01:50 PM
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Join Date: Mar 2004
Location: Windsor, CT
Posts: 2,119
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LHS Case through-bolt holes needed chamfers.
AND the RHS holes behind the oil cooler. 12.7-12.9mm OD of the chamfer. (.5" diameter)   If you look closely in the upper right hand corner of the second picture, you can see one of the through-bolt holes that came chamfered from the factory. I measured this chamfer, and machined to match using a chamfer bit and a hand drill to control the process. Go slow! Check often.
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Mike '82 911SC, SSI, 22/29 tbars, 22F/22R Adj swaybars, Bilstein Sport, Elephant polybronze & monoballs, Cambermeister bar, turbo tierods, Carrera oil cooler, front brake cooling ducts, Sparco Sprint 5 & Recaro SRD PAX seat, Teamtech harness, DAS Sport rollbar. |
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02-14-2016, 05:21 PM
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Location: Seattle or LA
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Quote:
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1971 911T (Tangerine) 1973 911T (Light Yellow) 1978 911SC -- "Northy" 3.2 twin plug 1990 911 Carrera 2 |
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02-14-2016, 05:53 PM
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Join Date: Mar 2001
Location: Marysville Wa.
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You could have just loosened one at a time and retorqued. Why is there loctite 574 (hate that stuff) on the main webs? You don't need any sealer there.
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02-14-2016, 06:39 PM
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It's supposed to glue the webs together and prevent shuffling. Not sure I see the need for it on a street engine and if I was building a race engine I'd just have it shuffle pinned or bushed around the through bolts. But it gets done a lot I guess, I just have a hard time seeing that stuff so close to the bearings and the through bolt holes. I guess it's suppose to dissolve in oil so no harm if it gets into the galley? I'd like to buy some and mix it with oil to see what happens.
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02-14-2016, 07:14 PM
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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,082
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Mag Cases NEED shuffle pins , Al is a nice option.
I so doubt anything you can pry apart at a later date will or would stop "shuffling " in use.
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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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02-14-2016, 07:19 PM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,132
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Yeah, I've questioned the need for it too (574 on webs), but used it anyways.
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02-14-2016, 07:30 PM
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Join Date: Apr 2002
Location: Omaha, NE
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Per Henry Schmidt's instructions in a well-read thread on case sealing Loctite 574 is used on the webs and threebond 1184 on the perimeter. This is Henry's tried and true method for sealing up a case and some methods were debated in the thread but a consensus was never met (if that's even possible on the internet).
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1980 911SC Targa 3.6L |
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02-15-2016, 05:50 AM
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Location: Windsor, CT
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The webs are pressurized oil passages. They feed the piston squirters. So there is a potential to leak between the mated mains.
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02-15-2016, 07:44 AM
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Location: Windsor, CT
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Wprater
Yes you do have to clean out all the little bits. But that is true of any used case covered in 30 years of dirt and grime. The little bits of al are easily cleaned out because they aren't embedded in the surface. |
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02-15-2016, 07:46 AM
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My 930, which was never opened up until now, shows no evidence of any sealer on the main webs. Plenty on the perimeter but that's it. I would think that if the web faces are far enough out of parallel to cause oil leakage between them then there are other major problems with the case? It's hard to argue against the success that Henry has had with his method though.
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02-15-2016, 05:23 PM
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Join Date: Jun 2015
Location: Seattle or LA
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Quote:
__________________
1971 911T (Tangerine) 1973 911T (Light Yellow) 1978 911SC -- "Northy" 3.2 twin plug 1990 911 Carrera 2 |
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02-16-2016, 12:21 AM
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Registered User
Join Date: Nov 2014
Posts: 24
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About the camfered holes for the through bolts in cases. I allso had that on mine. Long story short: my case halves was of not only different serial numbers, but one was from -83 and didn't have the camfered holes, the other was from -87 and had the camfered holes. So my gestimation is that Porsche incorporated this modification sometime between here. I allso camfered the holes on my case halve from -83.
Good luck with the rest of youre build. |
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02-18-2016, 02:17 PM
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Join Date: Jul 2000
Location: So. Calif.
Posts: 19,910
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Not a big deal to stress about. Just take it apart, clean, then redo. It's not as though you're at assembly step 26 and have to redo step 2. Good to have a check list as you assemble so you don't forget to install something, like piston rings.
Remember to confirm crank rotates smoothly while tightening the through bolts/nuts. Sherwood |
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02-18-2016, 02:55 PM
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