I had a customer ask me how to install a vernatherm in a Carbon Cub, so here it is. First we will remove the bypass spring and piston. In order to remove these we will first remove the threaded plug that keeps these two items in place.
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Remove the spring, then remove the piston using a pick or piece of wire. The piston is down the passage a ways. BE CAREFUL NOT TO SCRATCH OR NICK THE WALLS OF THE RELIEF PASSAGE WHEN REMOVING THE PISTON.
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Once you have retrieved the spring and piston, reinstall the threaded plug (torque to 300inlbs) and safety the plug. Now lets move on to the oil screen housing shown below.
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Remove the oil temperature probe from the housing and loosen the vernatherm plug. Now remove the four bolts that hold the housing to the accessory drive case and remove the housing. On Carbon Cubs there isn’t enough room between the housing and firewall to install the vernatherm.
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Remove the vernatherm plug and oil screen (now would be a good time to inspect and clean your oil screen). Screw the vernatherm into the housing and reinstall the screen. DO NOT TIGHTEN THE VERNATHERM AT THIS TIME. VERIFY THAT THE GASKET BETWEEN THE VERNATHERM AND HOUSING HAS BEEN INSTALLED.
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A new gasket should be used between the accessory drive case and oil screen housing (make sure both surfaces are clean before installation). Reinstall the oil screen housing and torque the housing bolts to 15inlbs. Tighten and safety the vernatherm (torque to 300inlbs), reinstall the oil temperature probe. Test run the engine and check for oil leaks. If you don’t have any oil leaks, you have just successfully installed your vernatherm.