Technical note

Hard barring after crankcase overhaul — clearances and alignment

Technical note · not a test report for a specific unit

After crankcase work, abnormal cold barring needs a clear source: bearing clearance, alignment, pump drag or something left in the case. Rating-engine crankshafts are not automotive break-in logic — insufficient clearance means open again, do not run tight.

Related: octane repair.

Next step

Tell us the engine model, the symptom, and the last rating run

A nameplate photo helps: research method, motor method, or cetane, and where the reading drifts.