Aircraft crankshaft seal tool

Overview Installs one piece stretch seals without damaging surface on seal or crankshaft. For all flange shafts per Continental Bulletin M Also fits Lycoming. For installing one piece stretch seals without damaging surface on seal or crankshaft. Cessna Fuel Quantity Transmitters. Hartzell Engine Technologies Propeller Hardware.

View in Catalog View in Catalog. Installs one piece stretch seals without damaging surface on seal or crankshaft. Follow lycoming instructions for installation.

Be sure to properly prepare crankcase before installation. Must be properly cleaned so glue will adhere. Stretch the spring evenly and smoothly over its whole length just enough to screw the ends together. Then stretch the seal over the flange and work the spring into the seal groove.

Follow Lycomings Service Letter for installation. The new spring is a screw in connection. I found it impossible to reconnect because my fingers were to big to fit in the space between the crankshaft flange, new seal and the case. I reused the old hook style spring which installed easily. So my advise is dont wreck the old spring when removing the old seal.

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The LW is a solid seal and the LW is a split seal. Split seals are easier to install, while the solid seals seem to last longer. I did not use a tool also when I replaced mine and found it was not hard to do. I watched a YouTube video before I did mine. I do recall reading somewhere a year or two ago about how to make your own tool for a couple bucks out of PVC electrical conduit but of course can not find it now. I used a 1 gallon Zip-Lock freezer bag over the flange for protection, softened up the seal in hot water for EZ stretch, worked it over the flange with the help of round shaft screwdrivers, then let it rest and shrink back up a day before I installed it.

Last edited by DanBaier : at AM. Originally Posted by DanBaier. You can do it. Erich, Not that bad of a job. I used the Lycoming instructions posted above. The instructions do reference using either Dow Corning or Pliobond 20 sealants. I did find a few postings online that referenced leaks from people that used Pliobond so I ordered the Dow which takes 24 hours to cure so it makes it a 2 day job. No leaks so far on mine. I probably spent 45 minutes to an hour cleaning up the old glue without scratching the surface of the crankshaft.

Installing the seal, spring and glue was probably 30 minutes. Probably could have made it work without the tool but I'm glad I have it now. Of course those times don't include removing or installing the prop. I also replaced the O-ring in my Hartzell CS prop Aircraft Spruce has them while it was off along with a new alternator belt. Very small amount of leakage on the front of the flywheel but the o-ring should fix that. Dow is not the easiest sealant to find but Skygeek has it as well as MSC.