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Registered
Join Date: Sep 2006
Posts: 8
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oil thermostat '73 RS
Wanting to change the 4 rubber lines connecting the fixed oil lines with the oil tank and the trombone on my '73 RS I undid all the lines and removed the thermostat that sits at the bottom of the oil tank. (I think this thermostat is unique to this year) When removing one of the oil lines from the thermostat a ball bearing (marble size) fell out. Presumably this ball bearing fits in the termostat but I can't see what holds it in place and what is its purpose besides being able to get into the oil line and cause a restriction. Any help appreciated.
Last edited by dbmRS; 09-05-2006 at 02:32 PM.. |
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09-05-2006, 11:25 AM
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Registered
Join Date: Mar 1999
Location: Cornwall-on-Hudson, New York, USA
Posts: 4,499
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That's not right.
Like a marble-size ball bearing or a wheel-bearing-size ball bearing? But there's nothing like either one in the "standard" 911 thermostat, which is not at the bottom of the oil tank in any case--it's up at the forward end of the right rear wheelwell. So RSes must be unique. You titled your post "oil thermostat," so maybe you ought to retitle it "'73 RS oil thermostat" then the RS guys will be on your case toot sweet. Stephan
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Stephan Wilkinson '83 911SC Gold-Plated Porsche '04 replacement Boxster |
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09-05-2006, 01:52 PM
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Join Date: Sep 2006
Posts: 8
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Steve: Thanks. The ball bearing is marble size and there does seem to be a 'seat' in the thermostat for it but nothing to keep it in place
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09-05-2006, 02:27 PM
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Join Date: Dec 2003
Location: Arapahoe County, Colorado, USA
Posts: 9,032
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dbmRS,
Welcome to the Forum.  You will find a lot of info and help here. Here are the schematic diagram and exploded parts diagram for the ’73 911S only (and I believe the RS). This is also what came on all Sportomatics (with a different oil tank) and could be special ordered on a ’73 911T or 911E. Few of these parts will interchange with other years. "  "© Dr. Ing. h.c. F. Porsche A.G. "  "© Dr. Ing. h.c. F. Porsche A.G. The problem is the “thermostat“ (#50 in the exploded diagram) is only a thermostat and does not have incorporated a pressure relief valve. Every other Porsche system has a safety relief valve that opens at approximately 100 psi. This isn’t an issue with the “trombone cooler.” It becomes a serious issue if you install the full-fin ‘72S cooler and others. I have previously told this story on myself so I won’t repeat here. If you have a ’73 with the original front cooler plumbing and you want a full-fin proper cooler up front, you need to change to the ’74 and later system where the thermostat has an integral safety pressure relief valve. I don’t recall the thermostat having a ball bearing but I only disassembled one, 33 years ago. I recall a screwey deal where it was more like a backwards pressure relief valve than a thermostat. It could be that someone forced the thermostat always open with a ball to attempt to reduce overheating. Is the trombone cooler still in place? The big issue was always the aluminum nut (#51) with left hand and right hand threads. Another great Rube Goldburg that was assisted by Josef Von Stupnagle.  If your use is for anything other than an exact restoration, I recommend you convert to the ’74-’89 front cooler parts. All are readily available. You should be able to find nice, undamaged original parts and then use the late Carrera cooler with the electric fan. There is some great Elephant Racing stuff also. Your original pipes and thermostat will look nice, all polished up on your garage wall.  Best, Grady 
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09-05-2006, 03:04 PM
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