Using bronze liners is one of the fastest and easiest ways to repair valve guides. Here are a couple of tips to make it even easier.
Use a centering cone
With the cone centered on the existing valve seat and the extended pilot of the boring reamer located in the existing guide, boring alignment is assured. With accurate alignment of the new guide, minimal seat work will be required to finish.
Use the correct size centering cone
The centering cone must fit the valve seat properly so using the correct size is essential. This is not a one-size-fits-all tool. Goodson carries 60° centering cones in diameters from 1” to 2-1/2” so you can find one that will fit the seat you’re working on. If you have a cone that’s too small for the seat it could slip right through the opening and if you have one that’s too large, the side of the chamber could interfere or you won’t have enough of the cone in the seat area for it to be stable and centered.
Image at left shows how the centering cone locates on the valve seat. In some chambers, particularly in small heads, the wall of the chamber may interfere with the placement of the cone. In this case, you will need a smaller cone so that it aligns in the seat correctly. Use the chart below to select the correct size centering cone for your application.
|1.00”||CL-6310||0.970” – 0.730”|
|1.25”||CL-6308||1.230” – 0.740”|
|1.50”||CL-6306||1.475” – 0.805”|
|1.75”||CL-6304||1.730” – 0.860”|
|2.00”||CL-6302||1.950” – 0.875”|
|2.25”||CL-6300||2.230” – 1.000”|
|2.50”||CL-6312||2.550” – 1.875”|
Use the correct tooling for best results
Several companies offer tooling for installing bronze liners and for the most part the tooling and the liners themselves are fully interchangeable with one important exception. Goodson offers liners for 5.0mm and 5.5mm guides and these two sizes require you use Goodson tooling.