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Banned
Join Date: Apr 2004
Location: Portugal
Posts: 1,513
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URGENT: Assembly of external oil thermostat
My mechanic (with very limited 911 experience) is assembling the external oil thermostat.
He is not sure regarding the orientation of the internal pistons, and the diagram from PET is not very clear... Does anyone has a better diagram or pics ?? Thanks |
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07-10-2009, 03:09 AM
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Somatic Negative Optimist
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Bentley SC Repair Manual page 170-8 shows the details.
Why would you go to a mechanic with little or no Porsche-experience? That usually compounds the problems and is not cheaper in the long run. The aux. thermostate is sensitive and important and expensive. People damage the threads by cross-threading the large nuts; Steel vs. Alu. Are you installing a better oil cooler?
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1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD! 1995 seafoam-green 993 C2, LSD, Sport seats.  Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ". 
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07-10-2009, 07:03 AM
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Banned
Join Date: Apr 2004
Location: Portugal
Posts: 1,513
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Gunter, unfortunately experienced 911 mechanics outside the official porsche network are hard to come by around here...
I just finished a major body rebuild that included adding a mocal oil cooler on the front left After a test run I noticed that the new cooler remained cold, so I suspected on the thermostat assembly... However, using the diagram from PET, we checked that everything was in the right place, so if after assembly the problem persists, it might be the regulator piston inside gone bad... |
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07-10-2009, 07:27 AM
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Registered
Join Date: Sep 2003
Location: PA of USA
Posts: 745
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To answer your question...
It does not matter... (the travel is axial to open and close -not rotational)
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1995 993 ('Under my Care') 1989 911 ('Go Pitt') 1996 993 ('Go Navy') 1984 911 ('Go Pelican') Last edited by Jascha; 07-10-2009 at 09:37 AM.. |
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07-10-2009, 09:33 AM
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Registered
Join Date: Dec 2003
Location: Arapahoe County, Colorado, USA
Posts: 9,032
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I agree with Jascha.
You cannot assemble it incorrectly. The key is that the thermostso piston is free in its bore and the temperature 'bulb' expands correctly. The only issue with the pressure relief is that the seating surfaces are in good condition and the piston is free to move against the spring. The greatest dificulties with this assembly are the threads and wrench slots of the cover plugs and the threads to the four pipe fittings. When clean and unscored, the internals are relatively trouble-free. Best, Grady
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ANSWER PRICE LIST (as seen in someone's shop) Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50 |
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07-10-2009, 10:57 AM
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GAFB
Join Date: Dec 1999
Location: Raleigh, NC, USA
Posts: 7,842
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I'd like to add to Jascha & Grady's advice above, and caution on the re-installation. It is possible to install the unit backwards (have seen it done!!)
If your wrench is inexperienced, just give him a heads-up on this.
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07-10-2009, 11:00 AM
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