High Pressure Seal Piston Rings Set 8-97388-734-0 For Isuzu 4JJ1 Turbo Diesel Engine Overhaul

This piston ring set (8-97388-734-0) is specially developed for the Isuzu 4JJ1 / 4JJ1-TC turbo diesel engine. It is an exclusive overhaul replacement kit for CX130 excavators and Isuzu light construction trucks. Manufactured to OEM clearance specifications, it perfectly matches STD pistons and 95.4 mm cylinder liners.

As a high-boost turbocharged engine, the 4JJ1-TC runs with higher firing pressure and operating temperature. Its piston rings are exposed to high-pressure impact, high heat, and carbon deposit erosion. Responsible for gas sealing, oil control, and heat transfer, this ring set is optimized through modified base material, surface hardening, gap precision, tension control, and sorting inspection to suit continuous heavy site load and frequent temperature fluctuation.

• Modified Ductile Iron Base — Thermal Shock Resistance & Anti-Breakage

  Improved ductile iron is adopted with better thermal fatigue and impact resistance. Under sharp pressure spikes during hard acceleration and continuous heavy load, the rings resist cracking and chipping, reducing the risk of broken rings and cylinder scuffing. Ideal for long-hour excavator operation and mountain heavy transport.

• Dense Chrome-Plated Compression Rings — High Temperature Resistance & Long Cylinder Pressure Retention

  The working face of the compression rings is coated with dense hard chrome, offering high hardness, heat resistance, and carbon wear resistance. Turbo engines run hot continuously, and ordinary rings wear quickly, leading to fast power loss. This set has a low wear rate, maintains a stable end gap, and solves poor acceleration, unstable idle, and hard cold start after long running hours.

• Balanced Expander Oil Ring — Solves High-Boost Turbo Engine Oil Blow-By

  High-boost turbo engines have higher crankcase pressure, which easily causes oil blow-by and blue smoke. The expander oil ring provides uniform pressure on the cylinder wall to scrape excess oil reliably while retaining a protective oil film, solving the well-known oil burning and turbo contamination problem after 4JJ1-TC overhaul.

• Individually Ground End Gap — Designed for Turbo Thermal Expansion

  Turbo engines have larger thermal expansion than naturally aspirated versions. Each ring is precision ground separately following OEM 4JJ1-TC specs. This avoids ring seizure after heat expansion or high-pressure gas leakage caused by an oversize gap. It brings better assembly tolerance for technicians and improves first-time repair success rate.

• Pre-Matched Set & Strict Batch Sampling Inspection — Stable Quality

  All ring sets are sorted and marked for the 4JJ1-TC turbo model only, not mixed with 4JH1 or 4JK1 rings. Hardness, end gap, and spring tension are sampled per batch. Defective units with poor coating or abnormal tension are rejected. Stable quality and a low return rate make this set excellent for export excavator spare stock and professional repair shops.

Ready stock available for individual ring sets, or full overhaul kits including piston, pin, circlips, and liner for 4JJ1 / 4JJ1-TC engine service.