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.

  1. 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. crankshaft and engine bearing installation

  2. Similarly, check the main bearing bores for alignment, taper, roundness, and size. Look at the condition of the bolts and threads. crankshaft and engine bearing installation

  3. 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. crankshaft and engine bearing installation

  4. With the engine block upside down, install the upper main halves, ensuring bearing backs remain clean and dry. crankshaft and engine bearing installation

  5. 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. crankshaft and engine bearing installation

  6. Lubricate the bearings. crankshaft and engine bearing installation guide

  7. The crankshaft should be set evenly into the main bearing. Next, install the lower bearings and caps, checking for proper fit and position. crankshaft and engine bearing installation

  8. Check for proper oil clearance. crankshaft and engine bearing installation

  9. Check the end clearance between the crankshaft thrust face and the bearing flange, with the crankshaft all the way forward. crankshaft and engine bearing installation

  10. As you install the connecting rod bearings, check for proper oil clearance. crankshaft and engine bearing installation

  11. Install the connecting rod and piston assembly. Torque bolts to manufacturer specifications. crankshaft and engine bearing installation

  12. Prime the engine oiling system. crankshaft and engine bearing installation

If you're having problems with your crankshaft, please give us a call at 844-215-3406 or request a quote online.

Source: Mahle

Originally published October 7, 2015, updated on September 27, 2018