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Intake Valve 1-12551139-0 For Isuzu FSR NPR 1125511390 Engine Isuzu Spare Parts
Product Overview
The Intake Valve (OEM Numbers: 1-12551139-0 / 1125511390) is a premium-quality, direct replacement engine valvetrain component designed for Isuzu FSR and NPR series medium-duty trucks equipped with various diesel engines. This valve opens at the correct time to allow fresh air into the combustion chamber, ensuring efficient engine breathing and performance.
Technical Specifiions
Part Number
1-12551139-0, 1125511390
Product Name
Intake Valve / Engine Intake Valve
Car Model
ISUZU FSR, ISUZU NPR
Engine Model
ISUZU 4BD1, 4BG1, 6BG1, etc.
Condition
100% Brand New
Origin
China Mainland
Warranty
6 Months
Quality Standard
OEM equivalent / ISO quality control
Features & Advantages
OE Quality: Manufactured to Isuzu dimensional and material specifiions for perfect fit and long service life
Heat-Resistant Alloy: Silicon-chromium steel resists oxidation and thermal fatigue
Hardened 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 hard starting
Direct Replacement: Matches OE length, head diameter, and stem size - no modifiion required
Cost-Effective: Affordable alternative to genuine OEM without compromising quality
Vehicle & Engine Compatibility
Isuzu Truck Models:
ISUZU FSR (medium-duty truck)
ISUZU NPR (medium-duty truck)
Other Isuzu trucks using 4BD1, 4BG1, 6BG1 engines
Engine Specifiions:
Engine
Displacement
Cylinders
Notes
4BD1
3.9L (3856cc)
Inline 4
Naturally aspirated
4BG1
3.9L (3856cc)
Inline 4
Turbo variant
6BG1
6.5L (6549cc)
Inline 6
N/A or turbo
Please verify fitment for your specific engine model
Installation Notes
Installation steps overview for OHV engine:
Remove cylinder head - as per engine service manual
Clean cylinder head - remove carbon deposits from valve ports and combustion chamber
Remove old intake valves - use valve spring compressor to release keepers, remove spring, and pull out valve
Inspect valve seats - grind or cut seats to proper angle and width
Lubrie new valve stem - with engine oil or assembly lube
Insert new intake valve - into the guide from the combustion chamber side
Install valve spring, retainer, and keepers - compress spring and secure keepers
Lap the valve (if necessary) - apply lapping compound and rotate valve against seat to ensure sealing
Check installed height - measure valve spring height; adjust with shims if needed
Reinstall cylinder head - with new head gasket. Torque head bolts to specifiion
Adjust valve clearance - set intake valve lash to OE specifiion (typically 0.25-0.35mm cold for Isuzu engines)
Start engine - check for smooth operation and correct valve train noise
Quality Control
Material Verifiion: Ensures metal brackets meet strength and corrosion-resistance standards
Dimensional Accuracy: Verified against OE specifiions for precise fit
Visual Inspection: 100% checked for cracks, defects, or manufacturing imperfections
Packaged Safely: Protected to prevent damage during transit
Packaging and 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 Intake Valve 1-12551139-0 For Isuzu FSR NPR 1125511390 Engine Isuzu Spare Parts, 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 ...
