Steve: According to the Continental C-75, C-85, C-90, O-200 Overhaul Manual, the average oil consumption for the C-90 is listed at 1/3 pint per hour or 1 qt every 6 hours. Let us know how all this turns out for you.
Regards Charles McKinnie F-1A, N3050G, GEU -----Original Message----- From: Steve Dold <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>; [EMAIL PROTECTED] <[EMAIL PROTECTED]> Date: Tuesday, August 25, 1998 8:41 AM Subject: Re: High oil temperatures in C-90s >At 07:23 PM 8/24/98 EDT, you wrote: >>Generally, high oil temperature is due to "blow by" , hot gases passing by >the >>rings into the crankcase - heating up the oil... This can and does occur >quite >>often when an airplane is flown infrequenytly, and the rings become stuck in >>the piston grooves. > >This might be a factor. The engine does use oil at a rate of about a quart >every two hours, and at least some of it is blowing out of the breather. >The compression check shows mid-70s in each cylinder though, so I'm >surprised at the oil use. > >One thing is, the engine has 750 since new, and new was 1970, so it hasn't >been flown regularly. God knows what has happened to the cylinder walls, >not to mention the cams and gears and such. > >Also, the oil gets black quickly, making me think it probably is blow-by. >I'll try the MMO, then pull the cylinders and have look if things don't >improve. As long as the owner doesn't mind :-) > > > >----------------------------------- >Steve Dold ([EMAIL PROTECTED]) >Say NO to useless over-quoting >-----------------------------------
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