ACL Main Bearing High Performance Standard Size with Extra Oil Clearance Set, #3 Thrust Bearing Position WRX 2002-2014 / STI 2004-2021 Subaru Turbo Models | 5M8297HX-STD

ACL's main bearings are crafted from a softer metal, which safeguards your crank and engine block from excessive wear. A thin oil layer lubricates the contact between the bearings and the crank, enabling the crank to 'float' and minimizing wear. Proper support from main bearings is essential to prevent oscillations and wear that can harm the crankshaft and other components as the engine becomes unbalanced. Bearings with extra oil clearance can better handle the stress of high - horsepower motors, but they may experience more wear during startup. We strongly recommend that only experienced professionals purchase these bearings. When buying Subaru main bearings, note that they are specific to either a #5 or #3 journal bearing position. The journal bearing position isn't determined by VIN or year; you must know it before purchasing. Engine internal components are non - exchangeable and non - returnable, so make sure you choose the right bearings.

Using these ACL main bearings is straightforward. First, make sure you know the correct journal bearing position (#5 or #3) for your Subaru turbo model before installation. Experienced professionals are recommended for the installation process due to the specific requirements. During startup, be aware that bearings with extra oil clearance may experience more wear. As for maintenance, regularly check the oil level and quality as the thin layer of oil is crucial for the bearings' performance. Keep an eye on the engine's balance and any signs of abnormal vibrations. If you notice anything unusual, have a professional inspect the bearings and other engine components. Remember, engine internals are non - returnable, so double - check your selection before buying.