For those of you planning on overhauling your engine or have found a fresh overhauled engine to buy, like myself, do yourself a favor, especially if a reconditioned crank shaft is being or was installed. Make sure to check the clearance between the crank shaft oil slinger and the aft side of the crank shaft oil seal retainer for .002 to .008 clearance. If this clearance is not maintained the slinger will throw oil into the seal and the only way to stop the crank seal from leaking is to split the case and grind the slinger or grind the case to achieve the proper clearance. Ask me how I know..... When a crank shaft is reworked the thrust surface can be ground .003. When this is done the slinger to case clearance is lost.
I will fly 3 more hours to get my 25 test period completed and the engine will be coming apart.
Here is a link to the lycoming site with information about the seal leak.
http://www.lycoming.textron.com/mai...ons/keyReprints/maintenance/noseSealLeak.html
I will fly 3 more hours to get my 25 test period completed and the engine will be coming apart.
Here is a link to the lycoming site with information about the seal leak.
http://www.lycoming.textron.com/mai...ons/keyReprints/maintenance/noseSealLeak.html