Airborne Flying Services of Hot Springs, Ark., developed and now offers the Valve Wizard, a set of three valve spring compressor tools for Lycoming O-235, O-290, IO/O-320, IO/O-360, AEIO-360, O ...

Tools You Will Need LS3 valve spring compressor Thread in compression tester (heads on engine) Magnet Spring height micrometer 11mm socket Small rubber mallet See All 14 Photos ...

Next, position the valve spring compressor and compress the spring and retainer assembly until the keepers can be removed. A magnet or an awl often simplifies keeper removal, but use care not to ...

This dimension is the coil-bind height and can be measured on the cylinder head with a spring compression tool. With the valve fully open there must be at least 0.050-inch clearance between the ...

This isn't difficult if you have the correct tools. Several companies offer an on-head spring compressor; we chose the TFS tool, but Comp Cams and Crane offer similar versions.