Connecting Rod: Description and Operation
DESCRIPTIONCONNECTING RODS
The connecting rods are a split angle design (Fig. 89). They have a pressed-in-place wrist pin bushing that is lubricated by piston cooling nozzle oil spray.
There are two different types of connecting rods: machined and fractured split. The main different between the two styles is the surface finish on the connecting rod split face.
Machined connecting rods can be identified by a machined surface at the connecting rod and cap split face. Machined connecting rods have numbers stamped on the rod cap and connecting rod near the parting line. The number stamped on the connecting rod must match the number stamped on the rod cap and be installed on the camshaft or intake side of the engine.
Fractured split connecting rods are first manufactured as a single piece and then fractured into two pieces. Fractured split connecting rods can be identified by a rough and irregular surface at the connecting rod split face. To properly assemble the rod cap to the connecting rod, the bearing tangs on the connecting rod and cap must be located on the same side of the rod. The long end of the connecting rod must be assembled on the intake or camshaft side of the engine.
Measuring methods and specifications are common between fractured split and machined connecting rods.
Both fractures split and machined connecting rods and caps are machined as an assembly and are not interchangeable. If a connecting rod or cap is damaged, the entire assembly must be replaced. Machined and fractured split connecting rods cannot be used in the same engine.