FLH 1999 - 2008 Adapter Key Installation StepsKeeping Your Harley Running Cooler with UltraCool
The adapter key is a unique product offered by Ultracool. Its function is to stop the oil adapter from rotating when you remove your oil filter. Bikes from 1993 -2006 don’t have a part of the case so the Ultracool team devised a way to stop your oil adapter from rotating. Below are 2 pictures with the part of the case and without. Check yours before you start your installation.
Remover oil filter and clean up filter mount. In the parts bag you will notice a 90 degree piece of metal referred to as an adapter key. If you have a bike from 1999-2006 you need to install this to prevent oil adapter rotation when changing your oil.
Remove the 7/8” adapter in center of oil filter mount. Place adapter key so long tab fits in the hole of the engine case. Add a few drops to thread locker adapter nut and replace the center of adapter key as shown.
In the FLH 1999 – 2008 Oil Cooler Installation Guide you will notice steps 2-3 are removing your stock or old oil cooler. Now continue on with step 4 of the installation.