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The cooling flaps fail OPEN, so unless the engine sat for many years and they rusted shut that was not the problem, and YES you need them! Cut your engine life roughly in half by having them out.... you need the engine to reach operating temperature as quickly as possible and it may NEVER get there with the flaps not working properly. ONE bearing bad is very unlikely if overheated, the majority would be affected. .020 is too much to cut a crank, your beyond the hardness layer, not sure if this lead so such a quick and sudden failure but if it wasn't cut properly it could have been an issue. My guess is something wrong with that #4 crank journal, rod, piston combination. Keith Top Notch Restorations topnotch@nycap.rr.com 71 Squareback 65 Notchback "El Baja Rojo" 65 Squareback "Eggcrate" 87 golf "Winterat" 93 RX7 "Redstur" -----Original Message----- From: Dave Sanderson [mailto:porschedave@rennlist.net] Sent: Sunday, June 04, 2006 2:03 PM To: type3 Subject: RE: [T3] Number 4 issues.. Hi We got our blown engine apart and it was a mess. However, it was the number 1 rod that let go not the # 4 that everyone else seems to have experienced. We're thinking that the engine must have overheated because those little flaps on the back of the cooling fan did not open. We're not 100% sure about that but have no other explanation unless the parts I used to build the engine were not as good as I thought. The case appeared to be fine and the machine shop said that they didn't think it needed boring. The crank had been reground 0.020 with all new bearings etc. So, my best guess is the engine simply got too hot. We're now thinking, when we build the next engine, that we will remove those flaps completely. We live in the Pacific Northwest, Vancouver B.C., where it never gets that cold and so we probably don't need those flaps. Maybe the engine will simply run a bit cooler all the time. Does that make sense to you? Dave ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~