OTTO Excavator Parts Tcm 4Lb1 Valve Spring Big 8970346296 897034-6296 8-97034629-6 For Isuzu OTTO Isuzu TCM 4LB1 Valve Spring Big 8970346296 – 100% genuine OEM excavator part, perfect fit for Isuzu 4LB1 engines. Bulk in-stock, fast global shipping. Superior elasticity & fatigue resistance vs aftermarket big springs, cuts rework & returns, boosts resale profits for wholesalers & agents.