Jun/Jul 2008

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ASSOCIATED AND GALLOWAY  VALVE TRAIN PROBLEMS

By Darvin E. Jahnke

Star Re. Box 357A Detroit Lakes, Minnesota 56501

The purpose of this article is to discuss problems which often occur in the valve train of the Associated and Galloway engines that use a flat valve pushrod supported by two cast guidesone on the block and one on the cylinder head. I have encountered problems on the two engines and I imagine the same situation could exist on other engines of similar design.

What happens is that the pushrod wears on the bottom side where it passes through the guides. The guides also wear some. When this happens it allows the centerline of the pushrod roller to drop below the centerline of the cam gear. When the cam lobe contacts the pushrod roller, it tries to push the roller down rather than forward. This causes everything to bind and puts a strain on all of the parts involved. The result is excessive w...

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