ISUZU Valve Guide 8mm Inner Diameter 50mm Length Precision Honed bore for 4JB1 4JA1 Engines OEM Standard
Basic Properties
Place of Origin:
CHINA
Brand Name:
YIMI
Certification:
ISO/TS16949
Model Number:
NKR55 4JB1 4JA1
Trading Properties
Minimum Order Quantity:
20 PCS
Price:
Negotiable
Payment Terms:
T/T
Supply Ability:
10000 pcs/month
Specifications
| Inner Diameter: | 8mm | Outer Diameter: | 14.03mm |
| Length: | 50mm | Unit Weight: | 0.05 Kg |
| Material: | High-quality Cast Iron / Powder Metal Alloy | Surface Finish: | Precision Honed Bore |
| Quantity per Cylinder: | 2 Per Cylinder | Installation Type: | Interference Fit Press-in |
| High Light: | 8mm Inner Diameter Valve Guide,50mm Length Valve Guide,Precision Honed bore Valve Guide |
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Product Description
ISUZU Valve Guide 5-11721016-0 5117210160 for NKR55 4JB1 4JA1 — 8×50mm OEM Standard
ISUZU Valve Guide 5-11721016-0 5117210160 Compatible with NKR55 4JB1 4JA1 Diesel Engine — 8*14*50mm OEM Standard Replacement
The ISUZU Valve Guide with OEM numbers 5-11721016-0 / 5117210160 is a precision-engineered replacement designed for ISUZU NKR55 series light-duty trucks, compatible with 4JB1 and 4JA1 diesel engines. This component is a core part of the engine's valve train — the Valve Guide (GUIDE; VLV) — pressed into the cylinder head to provide precise guidance and support for the valve stem, ensuring accurate reciprocating motion of intake and exhaust valves.
Numbering Note: This product number is 5-11721016-0 / 5117210160, also listed as 5-11721-016-0. Cross-reference numbers include 1007101-44, 1003102FA, and 94029347. Brands include MAMUR. Please verify the specific number based on actual vehicle configuration.
Working Principle
The valve guide is a precision tubular component press-fitted into the cylinder head, with the valve stem reciprocating within its bore. Its core functions include:
- Precise Guidance: Ensures the valve moves along the correct axis, allowing the valve head to seat precisely against the valve seat for perfect sealing.
- Heat Dissipation: Transfers high-temperature heat from the valve head through the valve stem to the cylinder head, where it is carried away by the cooling system.
- Wear Protection: Acts as a sacrificial component, absorbing the reciprocating friction of the valve stem to protect the expensive cylinder head from wear.
- Lubrication & Sealing: The bore retains a small amount of oil to lubricate the valve stem-to-guide interface, reducing friction resistance.
Failure Symptoms
⚠️ Inspect immediately if any of these occur
| Symptom | Probable Cause |
|---|---|
| Significantly increased oil consumption; blue smoke from exhaust | Worn valve guide causing excessive stem-to-guide clearance; oil entering combustion chamber |
| Rough idle, power loss | Worn guide causing poor valve sealing; reduced compression pressure |
| Hard starting, especially cold starts | Poor valve sealing; compression pressure below ignition requirement |
| Valve train noise ("ticking" sound) during operation | Worn guide causing valve stem to deviate from proper seating |
| Uneven valve stem wear or heavy carbon deposits found during cylinder head disassembly | Worn guide or poor lubrication causing abnormal stem wear |
Technical Specifications
🔬 Based on Industry Standards & General Validation:
✅ Dimensions: Inner Diameter 8mm, Outer Diameter 14.03mm (approx. 14mm), Length 50mm. Some suppliers list as 8*14*53mm. Please verify with original part measurements before installation.
✅ Material Standard: Manufactured from High-Quality Cast Iron or Powder Metal Alloy — excellent wear resistance and thermal conductivity.
✅ Surface Finish: Precision Honed inner bore for smooth valve stem movement.
✅ Installation Type: Interference Fit pressed into cylinder head— requires special valve guide press tool.
✅ Unit Weight: Approx. 0.05 kg.
✅ HS Code: 840999900 (reference for same-series products).
✅ OE Cross-Reference Verified: Replaces OEM numbers 5-11721016-0 / 5117210160; compatible with 5-11721-016-0, 1007101-44, 1003102FA, 94029347.
✅ Compatible Engines: ISUZU 4JB1, 4JA1, 4JG1, 4JG2, 4JH1, C190, C240.
✅ Compatible Models: ISUZU NKR55, NHR, NPR, NQR, QKR, TFR, TFS, UBS, 700P, 100P.
✅ Quantity per Cylinder: 2 per cylinder, 8 per 4-cylinder engine.
✅ Condition: Brand New — 100% quality inspected.
✅ Warranty: 1 year.
✅ Place of Origin: China
✅ Dimensions: Inner Diameter 8mm, Outer Diameter 14.03mm (approx. 14mm), Length 50mm. Some suppliers list as 8*14*53mm. Please verify with original part measurements before installation.
✅ Material Standard: Manufactured from High-Quality Cast Iron or Powder Metal Alloy — excellent wear resistance and thermal conductivity.
✅ Surface Finish: Precision Honed inner bore for smooth valve stem movement.
✅ Installation Type: Interference Fit pressed into cylinder head— requires special valve guide press tool.
✅ Unit Weight: Approx. 0.05 kg.
✅ HS Code: 840999900 (reference for same-series products).
✅ OE Cross-Reference Verified: Replaces OEM numbers 5-11721016-0 / 5117210160; compatible with 5-11721-016-0, 1007101-44, 1003102FA, 94029347.
✅ Compatible Engines: ISUZU 4JB1, 4JA1, 4JG1, 4JG2, 4JH1, C190, C240.
✅ Compatible Models: ISUZU NKR55, NHR, NPR, NQR, QKR, TFR, TFS, UBS, 700P, 100P.
✅ Quantity per Cylinder: 2 per cylinder, 8 per 4-cylinder engine.
✅ Condition: Brand New — 100% quality inspected.
✅ Warranty: 1 year.
✅ Place of Origin: China
| Part Number: | 5-11721016-0 5117210160 | Product Name: | Valve Guide |
| Car Model: | NKR55 | Engine Model: | 4JB1 4JA1 |
| Condition: | 100% Brand New | Size: | Standard |
| Weight: | Standard | Origin: | China Mainland |
| Main Market: | Middle East, Asia, Africa, South America, North America & Europe | ||
| Package: | Neutral Packing Or Make It As Requested | ||
Vehicle & Engine Compatibility
Primary Applications:
| Brand | Model Series | Compatible Engine | Notes |
|---|---|---|---|
| ISUZU | NKR55 | 4JB1, 4JA1 | Light-duty truck |
| ISUZU | NHR | 4JA1, 4JB1 | Light-duty truck |
| ISUZU | NPR | 4JB1 | Light/medium-duty truck |
| ISUZU | TFR | 4JA1, 4JB1 | Pickup truck |
| ISUZU | TFS | 4JA1, 4JB1 | Pickup truck |
| ISUZU | 700P | 4JB1 | Medium-duty truck |
| ISUZU | 100P | 4JB1 | Light-duty truck |
Extended Applications:
| Brand | Model Series | Compatible Engine | Notes |
|---|---|---|---|
| ISUZU | NQR | 4JG1, 4JG2 | Medium-duty truck |
| ISUZU | QKR | 4JA1, 4JB1 | Light-duty truck |
| ISUZU | UBS | 4JA1, 4JB1 | SUV |
| JMC | 1030/1040/1050/1060 | 4JB1 | Jiangling light truck |
| JAC | Light truck series | 4JB1 | JAC light truck |
| FOTON | Light truck series | 4JB1 | Foton light truck |
| GREATWALL | Pickup series | 4JB1 | Great Wall pickup |
| CHEVROLET | LUV 2.8 | 4JB1 | Chevrolet pickup |
Extended Compatibility Note: This product is primarily designed for ISUZU 4JB1/4JA1 engines. Other sources indicate it also fits 4JG1, 4JG2, 4JH1, C190, C240 engines. It is also compatible with JMC, JAC, FOTON, GREATWALL models equipped with 4JB1 engines. A 4-cylinder engine requires 8 valve guides.
Important Fitment Warnings
- Number Confirmation: This product number is 5-11721016-0 / 5117210160. Cross-reference numbers include 1007101-44 and 1003102FA. Verify the specific number on the original part before ordering.
- Size Confirmation: This product measures ID 8mm / OD 14.03mm / Length 50mm. Some suppliers list as 8*14*53mm. Verify with original part measurements before ordering.
- Installation Method: Valve guides are installed with an interference fit — use a special pressing tool to remove old guides and press in new ones. DO NOT use a hammer to avoid damaging the guide or cylinder head.
- Post-Installation Reaming: After pressing in, the guide bore may deform slightly — use a valve guide reamer to achieve the correct stem-to-guide clearance.
- Associated Components: When replacing valve guides, it is recommended to replace valve stem seals simultaneously and check valve stem-to-guide clearance.
- Quantity per Engine: 2 per cylinder (1 intake + 1 exhaust), 8 total for 4-cylinder engines.
- Professional Installation: Valve guide replacement is a core engine overhaul procedure requiring cylinder head disassembly — must be performed by a qualified engine repair technician.
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