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ISUZU Heat-resistant Steel Intake Valve with 45° Valve Seat Angle - OEM Standard Fit for 6BG1 6BD1 4BD1 Engines
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ISUZU Heat-resistant Steel Intake Valve with 45° Valve Seat Angle - OEM Standard Fit for 6BG1 6BD1 4BD1 Engines
  • name
  • name

ISUZU Heat-resistant Steel Intake Valve with 45° Valve Seat Angle - OEM Standard Fit for 6BG1 6BD1 4BD1 Engines

MOQ: 20 PCS
Price: Negotiable
Standard Packaging: Neutral Package or as customers’ request
Delivery Period: 5-8 Work Days
Payment Method: T/T,Western Union
Supply Capacity: 10000 pcs/month
Detail Information
Product Description
Detail Information
Place of Origin
CHINA
Brand Name
YIMI
Certification
ISO/TS16949
Model Number
6BG1 6BD1 4BD1 FSR NPR
Valve Type:
Intake Valve
Quantity Per Set:
6 Pcs/set
Valve Head Diameter:
Engine Model Dependent
Valve Seat Angle:
45°
Valve Stem Diameter:
Engine Model Dependent
Material:
Heat-resistant Steel
Valve Overall Length:
Engine Model Dependent
Unit Net Weight:
0.14～0.15 Kg
Highlight:

Heat-resistant steel Intake Valve

,

OEM Standard Fit Engine Valve

,

45° Valve Seat Angle VALVE; INL

Product Description
ISUZU Intake Valve 1-12551139-0 1125511390 for 6BG1 6BD1 4BD1 Engine
OEM Standard Fit for FSR NPR Trucks & Hitachi Excavators
ISUZU Intake Valve 1-12551139-0 1125511390 Compatible with 6BG1 6BD1 4BD1 4BG1 Engines -- For FSR NPR NQR Trucks & Hitachi Excavators, OEM Standard Replacement
Product Overview
The ISUZU Engine Intake Valve with OEM numbers 1-12551139-0 / 1125511390 is a precision-engineered replacement designed for ISUZU 6BG1, 6BD1, 4BD1, 4BG1 series diesel engines. This valve is widely used in ISUZU FSR, NPR, NQR series trucks as well as Hitachi excavators and other construction machinery.
Working Principle
The intake valve is a vital part of the engine's valve train. During the intake stroke of a four-stroke engine, as the piston moves downward, the intake valve opens in advance and closes later (driven by the camshaft) to ensure more air/mixture enters the cylinder. The opening and closing timing must precisely match the piston position in the cylinder.
Failure Symptoms
⚠️ Inspect immediately if any of these occur:
Symptom Probable Cause
Noticeable power loss; poor acceleration; difficulty climbing hills Intake valve poor sealing; reduced cylinder compression pressure
Rough idle; engine vibration; hard starting Incorrect valve clearance or burnt valve; unstable intake air volume
Black smoke from exhaust (diesel) or increased fuel consumption Insufficient intake air causing incomplete combustion; improper air-fuel ratio
Distinct "tapping" metallic noise from engine Excessive valve clearance; or valve spring fatigue/fracture
Cylinder compression test reading below specification Worn valve seat or bent valve stem; valve fails to seal completely
Technical Specifications
Material Standard: Heat-resistant steel with operating temperature range of -40°C to 800°C
Dimensional Precision: Valve stem diameter machining precision to ±0.005 mm; valve seat angle 45° or 30°
Hardness Specification: Valve seat induction-hardened to HRC 50-55; valve stem tip hardness HRC 55-60
Unit Weight: 0.14-0.15 kg per piece
📌 Data Source Note: Material, hardness, and dimensional data are based on ISUZU 6BG1/6BD1 series engine factory workshop manual technical specifications and general industry standards (ISO, JIS). Test reports available upon request.
ISUZU Intake Valve 1-12551139-0 Technical Diagram
Part Number: 1-12551139-0 1125511390
Product Name: Intake Valve
Car Model: FSR NPR
Engine Model: 6BG1 6BD1 4BD1
Condition: 100% Brand New
Vehicle & Engine Compatibility
Primary Engine Applications:
Engine Model Displacement Primary Application
ISUZU 6BG1 6.5L FSR/NPR trucks, Hitachi excavators
ISUZU 6BD1 5.8L FSR/NPR trucks, construction equipment
ISUZU 4BD1 3.9L NPR trucks, Hitachi excavators, JCB
ISUZU 4BG1 4.3L Construction equipment, excavators
Important Fitment Warnings:
  • Intake vs. Exhaust Valve: This product is the Intake Valve with OEM 1-12551139-0. Exhaust valves use different part numbers.
  • Valve Clearance Adjustment: After installation, valve clearance must be adjusted per ISUZU factory workshop manual specifications.
  • Set Replacement Recommended: Replace intake and exhaust valves together with valve stem seals and valve springs.
  • Valve Seat Inspection: Always inspect valve seat wear when replacing valves.
  • Timing System Confirmation: Verify engine timing marks are aligned before installation.
Features & Benefits
High-Quality Heat-Resistant Steel Construction: Excellent high-temperature strength and creep resistance; maintains structural integrity at 800°C.
Precision Machining Process: Valve stem diameter precision to ±0.005 mm; valve seat angle accurate to 45°.
Valve Stem Tip Hardened: Tip hardness HRC 55-60 for superior wear resistance.
100% Factory Quality Inspection: 100% dimensional, hardness, and visual inspection on every piece.
Broad OEM Cross-Compatibility: Replaces OEM numbers 1125511650 / 1-12551165-0.
One Part Number, Multiple Engine Models: Same valve fits 6BG1, 6BD1, 4BD1, 4BG1, 4BC2 engines.
Quality Control
QC Item Inspection Method Acceptance Criterion
Valve stem diameter Laser micrometer / Micrometer ±0.005 mm
Valve seat angle Special angle gauge / Profilometer 45° ± 0.5°
Valve seat hardness Rockwell hardness tester (HRC) HRC 50-55
Valve stem tip hardness Rockwell hardness tester (HRC) HRC 55-60
Installation & Maintenance
⚠️ IMPORTANT SAFETY NOTICE: Engine valves and cylinder head areas reach extremely high temperatures after operation. Allow the engine to cool completely before proceeding. Professional installation with specialized tools is strongly recommended.
Maintenance Schedule:
Item Interval Notes
Valve clearance check/adjustment Every 20,000-30,000 km Check immediately if noise detected
Cylinder compression test Every 50,000 km Check valve sealing integrity
Valve assembly replacement Engine overhaul (300,000-500,000 km) Depends on operating conditions
Packaging & Supply
Packaging Inner: Anti-rust bag / oil paper
Outer: Standard export carton
Quantity per package 6 pcs/set (for 6-cylinder engines)
Unit net weight Approx. 0.14-0.15 kg
Target Customers Truck parts wholesalers, repair shops, construction equipment parts suppliers
Tags: 

isuzu tfr parts,  

isuzu replacement parts,  

ISUZU Starter Motor

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Products
PRODUCTS DETAILS
Products

Isuzu Cars Parts

Isuzu Engine Parts

Isuzu Chassis Parts

ISUZU Truck Parts

VW Car Parts

AUDI Car Parts

QINGLING ISUZU Parts

NISSAN Spare Parts

MITSUBISHI Auto Parts

FUSO Truck Parts

TOYOTA Auto Parts

HINO Truck Parts

HONDA Auto Parts

MAZDA Spare Parts

JAC Spare Parts

JMC Spare Parts

FORD Auto Parts

HYUNDAI Auto Parts

KIA Auto Parts

Other Auto Parts
ISUZU Heat-resistant Steel Intake Valve with 45° Valve Seat Angle - OEM Standard Fit for 6BG1 6BD1 4BD1 Engines
  • name
  • name
ISUZU Heat-resistant Steel Intake Valve with 45° Valve Seat Angle - OEM Standard Fit for 6BG1 6BD1 4BD1 Engines
MOQ: 20 PCS
Price: Negotiable
Standard Packaging: Neutral Package or as customers’ request
Delivery Period: 5-8 Work Days
Payment Method: T/T,Western Union
Supply Capacity: 10000 pcs/month
Detail Information
Product Description
Detail Information
Place of Origin
CHINA
Brand Name
YIMI
Certification
ISO/TS16949
Model Number
6BG1 6BD1 4BD1 FSR NPR
Valve Type:
Intake Valve
Quantity Per Set:
6 Pcs/set
Valve Head Diameter:
Engine Model Dependent
Valve Seat Angle:
45°
Valve Stem Diameter:
Engine Model Dependent
Material:
Heat-resistant Steel
Valve Overall Length:
Engine Model Dependent
Unit Net Weight:
0.14～0.15 Kg
Minimum Order Quantity:
20 PCS
Price:
Negotiable
Packaging Details:
Neutral Package or as customers’ request
Delivery Time:
5-8 Work Days
Payment Terms:
T/T,Western Union
Supply Ability:
10000 pcs/month
Highlight

Heat-resistant steel Intake Valve

,

OEM Standard Fit Engine Valve

,

45° Valve Seat Angle VALVE; INL

Product Description
ISUZU Intake Valve 1-12551139-0 1125511390 for 6BG1 6BD1 4BD1 Engine
OEM Standard Fit for FSR NPR Trucks & Hitachi Excavators
ISUZU Intake Valve 1-12551139-0 1125511390 Compatible with 6BG1 6BD1 4BD1 4BG1 Engines -- For FSR NPR NQR Trucks & Hitachi Excavators, OEM Standard Replacement
Product Overview
The ISUZU Engine Intake Valve with OEM numbers 1-12551139-0 / 1125511390 is a precision-engineered replacement designed for ISUZU 6BG1, 6BD1, 4BD1, 4BG1 series diesel engines. This valve is widely used in ISUZU FSR, NPR, NQR series trucks as well as Hitachi excavators and other construction machinery.
Working Principle
The intake valve is a vital part of the engine's valve train. During the intake stroke of a four-stroke engine, as the piston moves downward, the intake valve opens in advance and closes later (driven by the camshaft) to ensure more air/mixture enters the cylinder. The opening and closing timing must precisely match the piston position in the cylinder.
Failure Symptoms
⚠️ Inspect immediately if any of these occur:
Symptom Probable Cause
Noticeable power loss; poor acceleration; difficulty climbing hills Intake valve poor sealing; reduced cylinder compression pressure
Rough idle; engine vibration; hard starting Incorrect valve clearance or burnt valve; unstable intake air volume
Black smoke from exhaust (diesel) or increased fuel consumption Insufficient intake air causing incomplete combustion; improper air-fuel ratio
Distinct "tapping" metallic noise from engine Excessive valve clearance; or valve spring fatigue/fracture
Cylinder compression test reading below specification Worn valve seat or bent valve stem; valve fails to seal completely
Technical Specifications
Material Standard: Heat-resistant steel with operating temperature range of -40°C to 800°C
Dimensional Precision: Valve stem diameter machining precision to ±0.005 mm; valve seat angle 45° or 30°
Hardness Specification: Valve seat induction-hardened to HRC 50-55; valve stem tip hardness HRC 55-60
Unit Weight: 0.14-0.15 kg per piece
📌 Data Source Note: Material, hardness, and dimensional data are based on ISUZU 6BG1/6BD1 series engine factory workshop manual technical specifications and general industry standards (ISO, JIS). Test reports available upon request.
ISUZU Intake Valve 1-12551139-0 Technical Diagram
Part Number: 1-12551139-0 1125511390
Product Name: Intake Valve
Car Model: FSR NPR
Engine Model: 6BG1 6BD1 4BD1
Condition: 100% Brand New
Vehicle & Engine Compatibility
Primary Engine Applications:
Engine Model Displacement Primary Application
ISUZU 6BG1 6.5L FSR/NPR trucks, Hitachi excavators
ISUZU 6BD1 5.8L FSR/NPR trucks, construction equipment
ISUZU 4BD1 3.9L NPR trucks, Hitachi excavators, JCB
ISUZU 4BG1 4.3L Construction equipment, excavators
Important Fitment Warnings:
  • Intake vs. Exhaust Valve: This product is the Intake Valve with OEM 1-12551139-0. Exhaust valves use different part numbers.
  • Valve Clearance Adjustment: After installation, valve clearance must be adjusted per ISUZU factory workshop manual specifications.
  • Set Replacement Recommended: Replace intake and exhaust valves together with valve stem seals and valve springs.
  • Valve Seat Inspection: Always inspect valve seat wear when replacing valves.
  • Timing System Confirmation: Verify engine timing marks are aligned before installation.
Features & Benefits
High-Quality Heat-Resistant Steel Construction: Excellent high-temperature strength and creep resistance; maintains structural integrity at 800°C.
Precision Machining Process: Valve stem diameter precision to ±0.005 mm; valve seat angle accurate to 45°.
Valve Stem Tip Hardened: Tip hardness HRC 55-60 for superior wear resistance.
100% Factory Quality Inspection: 100% dimensional, hardness, and visual inspection on every piece.
Broad OEM Cross-Compatibility: Replaces OEM numbers 1125511650 / 1-12551165-0.
One Part Number, Multiple Engine Models: Same valve fits 6BG1, 6BD1, 4BD1, 4BG1, 4BC2 engines.
Quality Control
QC Item Inspection Method Acceptance Criterion
Valve stem diameter Laser micrometer / Micrometer ±0.005 mm
Valve seat angle Special angle gauge / Profilometer 45° ± 0.5°
Valve seat hardness Rockwell hardness tester (HRC) HRC 50-55
Valve stem tip hardness Rockwell hardness tester (HRC) HRC 55-60
Installation & Maintenance
⚠️ IMPORTANT SAFETY NOTICE: Engine valves and cylinder head areas reach extremely high temperatures after operation. Allow the engine to cool completely before proceeding. Professional installation with specialized tools is strongly recommended.
Maintenance Schedule:
Item Interval Notes
Valve clearance check/adjustment Every 20,000-30,000 km Check immediately if noise detected
Cylinder compression test Every 50,000 km Check valve sealing integrity
Valve assembly replacement Engine overhaul (300,000-500,000 km) Depends on operating conditions
Packaging & Supply
Packaging Inner: Anti-rust bag / oil paper
Outer: Standard export carton
Quantity per package 6 pcs/set (for 6-cylinder engines)
Unit net weight Approx. 0.14-0.15 kg
Target Customers Truck parts wholesalers, repair shops, construction equipment parts suppliers
Tags: 

isuzu tfr parts,

isuzu replacement parts,

ISUZU Starter Motor

Yimi (Guangzhou) Automotive Parts Co, Ltd
Unit 1313, Building 5, Changsheng DDP Fashion Center, No. 17 Dachi Road, Tancun, Shijing Subdistrict, Baiyun District, Guangzhou City.
Tel: +86-17820569171
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