5878177121 Original Excavator Engine Repair Kit for ISUZU Engine 4JJ1

Part number 5878177121 is the original engine repair kit (overhaul kit) provided by ISUZU (Isuzu) for the 4JJ1 series four cylinder turbocharged diesel engine. This component is mainly used for systematically replacing all core seals and vulnerable parts during engine overhaul, and is a key kit for restoring engine sealing performance and preventing oil/coolant leakage. Its universal models cover various medium-sized hydraulic excavators equipped with 4JJ1 engines, such as Hitachi ZX120, ZX135, ZX160 and other 12-16 ton models, as well as similar equipment such as Komatsu PC130, PC160, Shengang SK135, SK160, etc. As a standard overhaul kit for original engines, all seal sizes and materials are perfectly matched with the 4JJ1 engine. It is strictly prohibited to mix non-standard aftermarket parts to avoid poor sealing, leakage, or engine damage.

This product is a complete set of engine seal combination package, mainly including dozens of precision accessories such as cylinder gasket (metal composite material), valve cover gasket, crankshaft front/rear oil seal, camshaft oil seal, valve oil seal, various O-rings and sealing gaskets. The cylinder gasket adopts a multi-layer stainless steel+graphite composite structure, with a temperature resistance of over 200 ℃ and a compressive strength of ≥ 15MPa; The oil seal is made of fluororubber or acrylic material, which is resistant to engine oil, high temperature (-30 ℃ to+150 ℃), and has good wear resistance. All parts in the kit are manufactured according to the original factory drawings and tolerance standards, ensuring reliable sealing and no leakage after installation, effectively restoring the engine compression ratio, preventing oil burning and coolant mixing.

Timing of replacement: When the engine burns oil, abnormal consumption of coolant, decreased power, idle shaking, or obvious leakage at the seal. Operation process: 1 Conducted by professional technicians in the clean room; 2. Completely disassemble the engine (cylinder head, oil pan, etc.); 3. Thoroughly clean all sealing surfaces (remove old gaskets and oil stains); 4. Replace all seals in the order specified in the maintenance manual (pay attention to the installation direction of the oil seal); 5. Use a torque wrench to tighten the bolts according to specifications (such as cylinder head bolts that need to be tightened diagonally and in stages to the specified torque); 6. Add engine oil and coolant after assembly; 7. Start the trial run and check for any leaks.