OTTO Excavator Parts Tcm 4Lb1 Connecting Rod Bolt 8941075506 894107-5506 8-94107550-6 For Isuzu This OTTO Excavator part, the connecting rod bolt for the TCM 4LB1 engine (8941075506), is crucial for securing the connecting rod in place. Designed for Isuzu engines, ensuring structural integrity for optimal performance.