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{"title":"NPR 700P 4HK1 TURBO CHARGE 8980000311 8970786400","imgUrl":"https:\/\/img.chinax.com\/nimg\/bf\/e4\/ab2ffd604bc21336062bab1561b6-200x200-1\/npr_700p_4hk1_turbo_charge_8980000311_8970786400.jpg","attrs":{"Model Number":"NPR 700P 4HK1","Place of Origin":"China","Minimum Order Quantity":"5 PCS","Supply Ability":"10000pcs\/month"}}
{"title":"NPR 4BD2 3.9L CYLINDER HEAD 8971030270","imgUrl":"https:\/\/img.chinax.com\/nimg\/c0\/a8\/bc770a27bfb7fb839df3007b51a1-200x200-1\/npr_4bd2_3_9l_cylinder_head_8971030270.jpg","attrs":{"Model Number":"NPR 4BD2","Place of Origin":"China","Minimum Order Quantity":"5 PCS","Supply Ability":"10000pcs\/month"}}
The Valve Insert Seat (OEM Numbers: 8-98028874-0 / 8980288740 / 8943958880 / 8-94395888-0) is a premium-quality, direct replacement engine valve train component designed specifically for ISUZU FVR34 series heavy-duty trucks equipped with 6HK1 and 4HK1 diesel engines. This precision-engineered intake valve seat insert — also known as a valve seat ring or valve insert — is press-fitted into the cylinder head and provides a durable, heat-resistant sealing surface for the intake valve to seat against. When the valve closes, it contacts the seat insert to form a gas-tight seal, which is essential for maintaining proper compression, preventing combustion gas leakage, and ensuring efficient engine breathing.
Function: The valve insert seat provides a hardened sealing surface for the intake valve to seat against, ensuring proper combustion chamber sealing, efficient airflow, and reliable engine compression in ISUZU diesel engines.
Application: Heavy-duty trucks and construction equipment
Installation Notes
Professional engine builder or mechanic installation is strongly recommended:
Ensure engine is cool — Allow the engine to cool completely before disassembly.
Disconnect battery — Always disconnect the negative terminal before working.
Remove cylinder head — Remove the cylinder head from the engine block to access the valve seats.
Remove valves — Use a valve spring compressor to remove the valve springs and valves.
Remove old valve seat insert — Use a valve seat puller or a suitable press to remove the old seat insert from the cylinder head. Alternatively, the seat can be machined out carefully.
Clean the seat bore — Thoroughly clean the valve seat bore in the cylinder head; remove carbon, oil, and debris.
Inspect the bore — Check the seat bore for wear, scoring, or damage; ream or replace the cylinder head if necessary.
Chill the new seat insert — For proper installation, chill the new valve seat insert in a freezer or with dry ice to slightly shrink it for easier press-fit.
Install the new valve seat insert — Press the new seat insert into the cylinder head bore using a proper driver and press until it is fully seated at the correct height. Ensure the smooth side of the attachment contacts the valve seat insert.
Grind/ream the seat — After installation, grind or ream the valve seat to achieve the proper contact width (2.5mm standard for intake valve) and concentricity with the valve guide.
Check contact pattern — Use marking compound to verify proper valve-to-seat contact pattern.
Inspect valve — Check the valve face and stem for wear or damage; replace if necessary.
Reinstall valves — Install the valves, valve springs, and retainers using a valve spring compressor.
Reinstall cylinder head — Install a new head gasket and reinstall the cylinder head; torque bolts to specification.
Start and test — Start the engine; check for proper operation, smooth idle, and no abnormal noise.
Road test / Operational test — Test the vehicle or equipment to verify proper engine performance and compression.
Quality Control
Material Verification: Confirms high-grade heat-resistant alloy steel composition (cobalt-based or high-nickel chromium alloy) meets ISUZU strength and wear resistance specifications.
Dimensional Inspection: Outer diameter (38mm), face angle (45°), and height verified within OEM tolerances.
Surface Finish Inspection: Seat face checked for proper smoothness, flatness, and absence of pits or cracks.
Hardness Testing: Seat material tested for proper hardness and resistance to valve recession.
Heat Resistance Testing: Sample tested for performance across specified temperature range (-30°C to +320°C).
Visual Inspection: 100% checked for cracks, machining defects, or surface imperfections.
Packaged Safely: Protected with rust inhibitor and packaged to prevent damage during transit.
Packaging & Delivery
Neutral export packing or customized packaging available
Carton or wooden case for safe transportation
Fast delivery for stock items
Shipping by Express Air or Sea
Inquiry
For pricing, availability, or bulk purchase of the Valve Insert Seat 8-98028874-0 8980288740 Intake For ISUZU FVR34 6HK1 4HK1 Diesel Engine, please contact our sales team for a competitive quote and expert technical support.
Yimi (Guangzhou) Automotive Parts Co., Ltd.
Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ... Yimi (Guangzhou) Automotive Parts Co., Ltd.
Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ...
