Over time all internal engine wear surfaces become worn. This is true for crankshaft journals; connecting rods; camshaft lobes; piston rings; bearings; etc. When rebuilding a worn out engine you ll need to replace them all in order to regain the engine s original performance. And; let s face it; Jeep s need all the power we can get. Omix-ADA offers new high quality replacement engine parts to get your Jeep back on the road.