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RE: [T3] Number 4 issues..


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

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