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Registered User
Join Date: May 2011
Posts: 2
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Oil pressure relief
While changing the oil, I removed the oil pressure relief on the bottom of the engine. When the pieces fell into the oil pan I only found the spring and sleeve. I put the assembly back in as shown on the diagram and notice that now when I drive the dauck gauge goes right to 5 (top) after the car warms up. I think that the piston fell out and I did not see it to get it back into the assembly. I have ordered from you a new one and just wanted to see if my suspicion of the missing piston is correct by the dauck readings? Plus my other question is can I install the new piston without draining out all the oil?
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05-31-2011, 12:45 PM
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Registered
Join Date: Oct 2004
Posts: 15,612
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Oh man, do NOT run the engine. Post year so the right diagram and part can be ordered.
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05-31-2011, 12:59 PM
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Join Date: Apr 2010
Location: New Orleans, LA
Posts: 1,493
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have you tried to use a magnetic pick up tool to fish other piece out of the oil pan, or poured the oil through a screen (you can get funnel w/ screen at auto parts stores).
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1982 911SC, Mocal oil cooler, Bilsteins, Carrera tensioners, backdated heat, factory short shift, Seine gate shift, turbo tie rods, pop off. 2005 Mercedes-Benz C230 kompressor sport 6-speed (daily driver) |
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05-31-2011, 01:02 PM
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Join Date: Oct 1999
Location: Marietta, GA
Posts: 809
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If the piston fell out you would not have any oil pressure. Did you have to compress, push hard, on the spring to get it started? If so the piston is still in the engine. It is not unusual for the piston to not fall out.
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05-31-2011, 01:34 PM
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Registered User
Join Date: May 2011
Posts: 2
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Response to responses
I check the oil and poured it through the a strainer but no piston appeared. The car does show good oil pressure but my concern was the druck gage going to the top after the engine starts. The car start up fine and runs smooth with the new oil change. No warning signs or knocks or pings. It may not have fallen out but how can I make sure it is there?
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05-31-2011, 02:00 PM
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Registered
Join Date: Apr 2011
Location: behind the redwood curtain, (humboldt county) california
Posts: 1,434
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Quote:
Does the pressure drop with low cold idle??? Occasionally,the piston really sticks in the bore and causes the cold pressure to go through the roof - this is not good either. I see 100 psi at 2000 rpm cold, dropping to 20-40 roughly warm (180-195). Basically, if you see high cold pressure that gradually tapers off to 45-65 F warm, you are ok. chris |
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05-31-2011, 04:48 PM
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Registered
Join Date: Dec 2003
Location: Arapahoe County, Colorado, USA
Posts: 9,032
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Take it back apart and count the pieces.
Use a magnet to get the piston out. Don’t mix these parts with the pressure safety relief that is horizontal. If you buy new parts, make absolutely sure you have a compatible set of pieces. There have been a number of changes over the years that require all three parts. Best, Grady
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05-31-2011, 06:38 PM
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