Premium-quality direct replacement exhaust valve designed for Isuzu NPR and NKR series medium-duty trucks equipped with the 4BG1 diesel engine.

Exhaust valve opens at the correct time to release burned gases from the combustion chamber. Precision-engineered for high-temperature resistance, ensuring efficient engine breathing and performance for Isuzu 4BG1 diesel engines.

• OE Quality: Manufactured to Isuzu dimensional and material specifications for perfect fit and long service life
• High-Temperature Alloy: 21-4N or equivalent steel resists oxidation, creep, and thermal fatigue
• Stellite-Faced Tip: Hardfacing on the valve tip reduces wear from rocker arm contact
• Precision-Ground Stem: Smooth surface reduces guide wear and ensures proper oil control
• Hardened Valve Face: Provides durable sealing against the valve seat, preventing gas leakage
• Restores Engine Performance: Eliminates compression loss, rough idle, and excessive exhaust smoke
• Direct Replacement: Matches OE length, head diameter, and stem size - no modification required
• Cost-Effective: Affordable alternative to genuine OEM without compromising quality

This exhaust valve is specifically designed for Isuzu NPR and NKR trucks with 4BG1 engine.

• ISUZU NPR (NPR59, NPR66, NPR70, etc. with 4BG1)
• ISUZU NKR (NKR55, NKR57, NKR59, etc. with 4BG1)
• Other Isuzu medium trucks using the 4BG1 engine - verify

• 4-Cylinder, Inline Diesel
• Displacement: 3.9L (3856cc, similar to 4BD1 but with different injection)
• Application: NPR, NKR, industrial equipment

• Material Verification: Alloy composition tested via spectrometer
• Dimensional Inspection: Head diameter, stem diameter, overall length, and keeper groove position verified against OE blueprints
• Hardness Testing: Tip hardness (HRC 50-55) and stem hardness checked
• Surface Finish Inspection: Stem surface roughness measured (Ra ≤ 0.2 μm)
• Straightness Test: Valve stem runout checked (≤ 0.05mm)
• Visual Inspection: 100% checked for cracks, burrs, or surface defects
• Packaged Safely: Valve wrapped in protective plastic or oiled paper, boxed individually or in sets

• 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

For pricing, availability, or bulk purchase of the Exhaust Valve 8-97028706-0 For Isuzu NPR NKR 4BG1 Engine 8970287060 Isuzu Engine Spare Parts, please contact our sales team for a competitive quote and expert technical support.