Question 412Motor Plants - Assistant Engineer

The correct answer is A) increased compression ratio. Inserting shims between the foot of a marine type connecting rod and a bearing box would increase the compression ratio of the engine. This is because the shims would effectively raise the position of the piston in the cylinder, reducing the clearance volume and resulting in a higher compression ratio. The other answer choices are incorrect. B) would decrease the compression ratio, C) would increase the bearing clearance, and D) would decrease the bearing clearance. Inserting shims is specifically done to increase the compression ratio by reducing the clearance volume in the cylinder.