Jonsered 670 Crankshaft and Bearings Replacement

Suitable Replacement Jonsered 670 Crankshaft and Bearings Parts

Here is some general information about the purpose and function of these parts that may include the Jonsered 670 crankshaft and bearings. The connecting rod can be either forged or cast. The rod can be one piece or made from two pieces. The connecting rod has needle bearings so that the connecting rod rides on the crankshaft rod journal. The piston is fastened to the connecting rod by a wrist pin supported by a needle bearing.

Performance Parts Supply air filters meet or exceed OEM specifications for Jonsered 670 crankshaft and bearings and they cost less than OEM replacement parts while maintaining excellent quality and durability. Extremely high chain saw RPMs drive the need for ball bearings and needle bearings on the crankshaft, connecting rod and wrist pin. At full throttle, the RPM of the engine can be nearly 15,000 [depending on the saw and manufacturer]. This equates to 250 revolutions per second.

The Jonsered 670 crankshaft has two other purposes. It provides a fastening point for the flywheel which controls inertia, spark timing, and cooling. The second purpose involves transmitting power from the crankshaft to drive the chain via a sprocket. The crankshaft will have a centrifugal clutch that is usually screwed into the crankshaft, keyed on, or tapered fit.

The Jonsered 670 bearings used on the crankshaft are rated for high speed and are a close tolerance bearing. The needle bearings are designed for high speed and close tolerance and can be either a caged needle bearing or a loose needle bearing.

The crankshaft has seals that ride on the crankshaft to keep outside air from entering the crankcase and to keep the fuel charge in the crankcase for the engine.