The copperhead (Agkistrodon contortrix) is a member of the pit viper family, like most of the venomous snakes in North America. The copperhead (Agkistrodon contortrix) is a member of the pit viper family, like most of the venomous snakes in North America.
The Command Thrust models use the same bigger gearcase housing as the Mercury 150 FourStroke, but with an all-new 2.38:1 ratio ideally suited for pontoons and heavier boats. Itâs the first true oversized gearcase in the industry for outboards in this horsepower range.
to its OD to produce a thrust face that is square to the axis of the main bearing journal. When assembling thrust bearings: 1. Tighten main cap bolts to approximately 10 to 15 ft.-lbs. to seat bearings then loosen. 2. Tap main cap toward rear of engine with a soft-faced hammer. 3. Tighten main cap bolts, finger tight. 4. Using a bar, force the crankshaft as far forward in the block as possible to align bearing rear thrust faces. 5. While holding shaft in forward position, tighten main cap bolts to 10 to 15 ft lbs. 6.