Actually Continental has a separate orfice that is used to calibrate the standard compression testers (which do have an orfice) Here is link to the Cont svc bulletin : http://www.sacskyranch.com/SB03-3.pdf Note that I was in error, if you have some valve leakage but the compression leakdown is within the limit set by the Continental calibrated orfice you are still good to go. Basically Continental says that at the higher pressures created by combustion the smaller leaks seal them selves, and if a borescope inspection does not show abnormalities and leakdown is within THEIR limits you are good to go. In real life, I usually pull the cylinder if it has valve leakage or oil blowby Bill
To: [EMAIL PROTECTED]: [EMAIL PROTECTED]: Sun, 4 May 2008 16:30:09 -0700Subject: Re: [ercoupe-tech] Grounded Al just a quick note from an A&P.. Leakeage from an intake valve is not considerd to be fatal since the incoming fuel will cool the valve, leakaage past the rings will burn oil and increase crankcase pressure, but a leaking exhaust valve will continue to destroy the valve since the hot gas will continue to errode the valve face.. Thats why most mechanics will pull a cylinder if an exhaust valve is leaking during a compression test . We have your safety uppermost in mind , losing a exhuast valve in flight would spoil just about anybody's day. By the way, all compression testers have a calibrated orrifice. Tom A&P/IA Couper3938H DeMarzo <[EMAIL PROTECTED]> wrote: Oh man! You using Sal for the cylinders? Your mechanic should have a calibrated orifice to check compressions. Continental says that compressions to 40 should be okay and that the combustion chambers and valves should be checked with a borescope when they're low. Any good A&P and all A&P's with IA should have a borescope. Are you using TCP in your gas? Al DeMarzoVisit the Ercoupe Swap Page Free, Easy and No Membership Requiredhttp://www.ercoupeowners.com/swap/swapbook.htm ----- Original Message ----- From: heavensounds To: [email protected] Sent: Saturday, May 03, 2008 9:26 PM Subject: [ercoupe-tech] Grounded Started my annual today. Checking compressions... 79 ! , 79 ! , 79 ! , and ... (drum roll) 59 and the noise of air escaping through the exhaust. : - ( Tried staking the exhaust valve. No success. Had to pull the jug. Called the guy who overhauled them 1 1/2 years ago and he said to bring it over (Saturday afternoon), that it probably was a stuck exhaust valve and it should be ready Monday afternoon. Can't complain about his response!! Another sour note is that we pulled a helicoil out on another cylinder when pulling out the spark plug. Something else to deal with. Well, as I used to tell my son: "Patience is the mother of happiness" Now It's my turn to apply it. Eliacim . _________________________________________________________________ Get Free (PRODUCT) RED™ Emoticons, Winks and Display Pics. http://joinred.spaces.live.com?ocid=TXT_HMTG_prodredemoticons_052008
