Magneto Armature Shim Packs/Oil Seals

Shims

It is important that the end float of the magneto armature or rotor is correctly set, otherwise noise, premature bearing failure and erratic timing can ensue. End float can be adjusted with shims behind the inner races of the bearings (usually the inner race next to the slip ring in a rotating-coil magneto) and/or with shims between the main housing and the end plate/housing of the magneto.

We supply a handy pack of steel armature shims. They have internal and external diameters of approximately 15.2 and 20.8 mm, and each pack contains five shims, one each in the following approximate thicknesses:

• 0.1 mm
• 0.2 mm
• 0.3 mm
• 0.5 mm
• 1.0 mm.

It is therefore possible to produce a combined thickness of anything between 0.1 mm and 2.1 mm in steps of 0.1 mm (4 thou).

Oil Seal

Reliable sources of the rather peculiar oil seals found in some magnetos are regrettably hard to find. However, we are able to offer oils seals to fit Lucas K1FC and K2FC magnetos, and also later versions of the Lucas K1F, K2F and KVF magnetos having an E18 bearing at the drive end.