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Registered
Join Date: Jun 2006
Location: Saint Joseph, Michigan
Posts: 220
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Draining oil from front oil cooler? '84 Carrera
I live in the upper midwest and it never gets hot enough here so that the oil thermostat in my '84 Carrera would open while driving so that "all" the oil can circulate through the engine "and" front oil cooler. So when I drain the oil for a oil change the oil in the oil cooler and all the lines never drains. Its been in there for several years. My question is "if" it ever gets hot enough to open the oil thermostat while I'm driving will the old oil in the oil cooler be bad when finally circulated/mixed with the fresh oil in the engine/oil tank? Just concerned about messing up my expensive engine with bad oil from the oil cooler/lines. Thanks!
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05-31-2013, 01:11 PM
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Member 911 Anonymous
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No, it will not hurt it. That is how our 3.2s were designed. If this really bothers you, put in lower temp oil and it shoul bring up the heat to open up the thermostat.
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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05-31-2013, 01:23 PM
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Administrator
Join Date: Feb 2000
Location: Los Angeles
Posts: 13,333
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I don't think it's possible that it's never warm enough for your thermostat to open. Do you only drive it in the winter? Google tells me the average high temperature in St. Joseph, MI is above 80° all summer long.
How are you confirming that your thermostat is not opening? It could be stuck -- in need of a rebuild or replacement.
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Jack Olsen 1972 911 My new video about my garage. • A video from German TV about my 911 |
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05-31-2013, 01:23 PM
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Schleprock
Join Date: Sep 2000
Location: Frankfort IL USA
Posts: 16,639
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What makes you think the oil cooler never sees any oil flow? After a long drive where the engine gets up to normal operating temperature for a lengthy time, park the car and reach up under the front valance and feel if the cooler is warm to the touch. You'll know it if it is circulating oil because it'll be hot to the touch such that it'll burn you if you touch it too long.
Or you can let your car idle for a long period of time. It will get up to temperature rather quickly since the fan speed is low and the car is moving. That will open the t-stat for sure, unless the t-stat is stuck. Honestly, it's not unheard of for the t-stat to stick closed. Had that happen on my '87 and it'd run noticeably hotter than a friend's '87 when we'd drive them at the track. But in just regular street driving, I never really took notice of higher than normal temps. Unbeknowst to me, my t-stat used to stick open because i'd hear the oil gurgling in the lines during startup. Never thought much about it until I read about it here on Pelican. I figured, oh well, better than being stuck closed. Well then it stuck closed not to long after..... The only way to drain the cooler is to disconnect it from the brass lines. Either disconnect at the t-stat (sometimes dicey due to stuck connections) or disconnect at the small flex lines . I recommend disconnecting the flex lines at the brass lines and not at the cooler. The flex line connections come apart better on the brass end than they do on the cooler end.
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Kevin L '86 Carrera "Larry" Last edited by KTL; 05-31-2013 at 01:26 PM.. |
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05-31-2013, 01:23 PM
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Schleprock
Join Date: Sep 2000
Location: Frankfort IL USA
Posts: 16,639
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BTW St. Joe is a FANTASTIC place. We visit there at least twice a year. I'll drop you a message next time we're in the area and maybe could meet up.
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Kevin L '86 Carrera "Larry" |
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05-31-2013, 01:24 PM
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Auxiliary thermostat........
Quote:
ourv12, Unless your auxiliary thermostat is defective, you don't have to worry about the residual oil in the auxiliary cooler (Carrera cooler) when you do an oil change. You were given some simple procedure how to check if the auxiliary thermostat is opening or not. I like to share with you the results of my investigation and testing to understand how these auxiliary thermostats work. Some of the latest auxiliary thermostats used for the tests:  Auxiliary thermostats and 3 thermostats in a water bath:  Notice the different behavior of the thermostat valves at 186°F. The one on the left is a bad thermostat (stuck closed, over-heating), the middle thermostat is partially open (running hot) and on the right is a good operating thermostat.  Once the oil temperature reaches 186°F (+/-) a good auxiliary thermostat would be open and allows the residual oil in the auxiliary cooler to flow back to the oil tank and fresh warmed oil flows through the cooler. Tony |
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05-31-2013, 02:12 PM
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Registered
Join Date: Jun 2006
Location: Saint Joseph, Michigan
Posts: 220
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05-31-2013, 02:45 PM
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Registered
Join Date: Jun 2006
Location: Saint Joseph, Michigan
Posts: 220
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Quote:
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05-31-2013, 02:48 PM
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Registered
Join Date: Jun 2006
Location: Saint Joseph, Michigan
Posts: 220
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05-31-2013, 02:50 PM
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Marble Grey
