Crankshaft and Engine Bearing Installation Guidelines
Proper crankshaft function hinges on a correct installation. Don't just guess when installing yours. Follow these easy steps to help make sure your crankshaft is properly installed.
- With a bore gauge or inside micrometer, check each connecting rod housing bore for taper, roundness, and size. Look for parallellisms between the large and small ends of the rod and check the condition of the bolts and threads.
- Similarly, check the main bearing bores for alignment, taper, roundness, and size. Look at the condition of the bolts and threads.
- Make sure the parts and engine block are clean and free of debris. Pay close attention to the oil passageways for additional dirt. Hot water and detergent are best for cleaning.
- With the engine block upside down, install the upper main halves, ensuring bearing backs remain clean and dry.
- Check the alignment of the oil holes to ensure oil can flow correctly. Make sure the locating tangs on the bearing match the slot in the bearing bore.
- Lubricate the bearings.
- The crankshaft should be set evenly into the main bearing. Next, install the lower bearings and caps, checking for proper fit and position.
- Check for proper oil clearance.
- Check the end clearance between the crankshaft thrust face and the bearing flange, with the crankshaft all the way forward.
- As you install the connecting rod bearings, check for proper oil clearance.
- Install the connecting rod and piston assembly. Torque bolts to manufacturer specifications.
- Prime the engine oiling system.
If you're having problems with your crankshaft, please give us a call at 844-215-3406 or request a quote online.
Originally published October 7, 2015, updated on September 27, 2018