Caution When Press Fitting Aluminum Timing Gears

When heating aluminum timing gears prior to press fitting on camshafts, caution should be exercised that the gears are not heated above 200 degrees F.

When timing gears are subjected to extreme temperatures, the aluminum gears do not return to their original dimensions after cooling. The result is a loose fit between the gears and camshaft. Under no circumstances should aluminum gears be heated with a torch.