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If you stop for a long time and the oil pressure on restart stays at zero, under what circumstances do you eventually get enough oil pressure to take off? ----- Original Message ----- From: "Steve Lewis" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Monday, May 30, 2005 2:16 AM Subject: [COUPERS-TECH] Need help with Loss of oil pressure problem > ----[Please read http://ercoupers.com/disclaimer.htm before following any > advice in this forum.]---- > > > I recently had my C85 rebuilt. After the rebuild on three occasions I > found that I start the plane up - the oil pressure is fine. I fly around > for an hour and oil pressure is fine - I land some where and have lunch. > After lunch I restart the engine and the oil pressure is 0!. The oil > pressure does not come up. > It appears that if the plane is allowed to sit overnight the oil > pressure will come up and be normal. Needles to say this is very > disturbing and I am looking for advice. > Here are the facts. In the rebuild the mechanic was concerned about > corrosion in the accessory case but had a company machine it and replaces > it. Hr replaced the gears on the oil pump. We also replaced the oil sump > with an 0200 sump (6 quarts instead of 4 ). I will commonly fly with 5 or > even 4.5 quarts in the sump. > The problem never happened before the engine was rebuild even though > things were loose enough that when the engine was warm the oil pressure at > idle would be in the 5-10 psi range and at cruise would drop into the > 20-30 psi range as the oil warmed. > My mechanic thinks the oil pump is losing prime as the thin, warm oil > leaks out from around the pump. I am not sure but cannot offer any other > explanation. The last tome the problem occurred I had the local mechanics > take off the oil filter and the cover to the old scree on the accessory > case and squirt in oil and nothing happened - leading me to wonder whether > loss of prime is a good explanation. > Oh yes - I have never had problems when I stop for a short time - long > enough to refuel, for instance. It takes a stop of about an hour - enough > for lunch. Once the oil pressure comes up it stays at 40 PSI without a > whimper > Any ideas???? > > > ========================================================================== ==== > To leave this forum go to: http://ercoupers.com/lists.htm > Search the archives on http://escribe.com/aviation/coupers-tech/ > > > > ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers-tech/
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