A831 Plunger Injector Pump with 10mm Plunger Diameter and 1-2μm Fitting Clearance for ISUZU 6BG1 4BG1
A831 Plunger Injector Pump with 10mm Plunger Diameter and 1-2μm Fitting Clearance for ISUZU 6BG1 4BG1
Key Attributes
Brand Name:YIMI
Place of Origin:CHINA
Certification:ISO/TS16949
Minimum Order Quantity:20 PCS
Price:Negotiable
Supply Ability:10000 pcs/month
Delivery Time:5-8 Work Days
Payment Terms:T/T
Standard Packaging:Neutral Package or as customers’ request
Product Summary
A831 plunger injector pump assembly with OEM numbers 1-15632058-0/1156320580. Made from GCr15 high-carbon chromium bearing steel with HRC60-64 hardness and 1-2μm precision clearance. Direct fit for ISUZU 6BG1/4BG1 engines and Hitachi ZX230/EX230 equipment. 100% factory tested with 12-month warranty.
Product Details
Highlight:
10mm Plunger Diameter Plunger Injector Pump
,High-carbon chromium bearing steel Plunger and Barrel Assembly
,1-2μm Fitting Clearance Fuel Injection Pump
Plunger Diameter:
10mm
Unit Weight:
0.07kg
Dimensions:
10×9×3cm
Material:
High-carbon Chromium Bearing Steel (GCr15)
Fitting Clearance:
1-2μm
Surface Hardness:
HRC60-64
OEM Part Number:
1-15632058-0 / 1156320580
Model Number:
A831
Product Description
Detailed Specifications & Features
A831 Plunger Injector Pump 1-15632058-0 1156320580 131150-4320 for ISUZU 6BG1 4BG1
A831 Plunger Injector Pump 1-15632058-0 1156320580 131150-4320 for ISUZU 6BG1 6BG1T 4BG1 ZX230 — ZEXEL Quality OEM
Product Overview
The Plunger Injector Pump (Plunger and Barrel Assembly), Model A831, with OEM numbers 1-15632058-0 / 1156320580 (ZEXEL cross-reference 131150-4320), is a verified direct-fit replacement for ISUZU 6BG1, 6BG1T, 4BG1 series diesel engines. This plunger assembly is the core precision component of the distributor-type injection pump (VE pump), responsible for pressurizing low-pressure fuel to injection pressure. It is widely used in ISUZU FSR, FTR, NPR, NQR series trucks and Hitachi ZX230, EX230, EX200-6 excavators.
How It Works
The plunger assembly consists of a plunger and barrel precision-fitted together, installed inside the injection pump head. When the camshaft drives the plunger in reciprocating motion within the barrel, the plunger descends to open the inlet port, allowing fuel to enter the plunger chamber; when the plunger ascends and closes the inlet port, the fuel in the chamber is compressed, rapidly rising to injection pressure (typically exceeding 100bar) and delivered through the delivery valve to the injectors, ultimately sprayed into the combustion chamber. The clearance between plunger and barrel is extremely small (typically 1-2μm), relying on the fuel itself for lubrication and sealing to ensure leak-free high-pressure fuel delivery.
Failure Symptoms
Replace immediately if any of these symptoms occur:
- Loss of Power — Poor acceleration; difficulty climbing hills (plunger wear causing insufficient fuel pressure and reduced injection quantity)
- Hard Starting — Engine difficult to start, especially cold starts (slow high-pressure fuel pressure buildup)
- Rough Idle — Engine idling vibration; unstable operation (uneven fuel injection quantity across cylinders)
- Black Smoke from Exhaust — Incomplete combustion; black smoke from exhaust (degraded fuel atomization quality)
- Increased Fuel Consumption — Noticeably worse fuel economy (inaccurate injection quantity)
- Injection Pump Noise — Abnormal noise from the injection pump during operation (plunger sticking or severe wear)
Technical Specifications
Model Number: A831 — standard ZEXEL plunger assembly model
Plunger Diameter: 10mm — exact match for 6BG1/4BG1 engine injection pump head specifications
Unit Weight: 0.07kg — standard weight for precise plunger reciprocating inertia
Dimensions: 10×9×3cm — standard packaging size
Material: High-carbon chromium bearing steel (GCr15) — quenched and precision-ground, hardness HRC60-64
Fitting Clearance: 1-2μm — precision-ground fit for high-pressure sealing
Cross-Reference Numbers: 9443611853, H131150432, 1311504320
OEM Numbers: 1-15632058-0 / 1156320580 / 131150-4320
Engine Compatibility: ISUZU 6BG1, 6BG1T, 4BG1, 4BD1, 6BD1
Brand: ZEXEL (OEM quality) / WEIFU / HIDROJET
Origin: Japan (ZEXEL OEM) / China (branded)
100% Factory Tested: Every plunger assembly undergoes clearance, hardness, and sealing integrity testing
Warranty: 12 months
| Part Number: | 1-15632058-0 1156320580 | Product Name: | Connecting Rod Assembly |
|---|---|---|---|
| Car Model: | 6BG1 4BG1 | Engine Model: | 6BG1 4BG1 |
| 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 | ||
| Material: | High-strength aluminum alloy & precision bearings | Cooling Type: | Engine coolant circulation |
| Installation: | Direct OEM replacement | Quality Standard: | OEM equivalent / ISO quality control |
Vehicle & Engine Compatibility
Truck Applications:
| Brand | Model | Engine | Notes |
|---|---|---|---|
| ISUZU | FSR | 6BG1 / 6BG1T | Primary fitment |
| ISUZU | FTR | 6BG1 / 6BG1T | Primary fitment |
| ISUZU | NPR | 4BG1 / 4BD1 | Primary fitment |
| ISUZU | NQR | 4BG1 / 4BD1 | Primary fitment |
| ISUZU | Forward | 6BG1 / 4BG1 | Compatible fitment |
Heavy Equipment Applications:
| Brand | Model | Engine | Notes |
|---|---|---|---|
| HITACHI | ZX230 | 6BG1T | Primary fitment |
| HITACHI | EX230 | 6BG1T | Primary fitment |
| HITACHI | EX200-6 | 6BG1-TRA-01 | Primary fitment |
| HITACHI | SH200 | 6BG1T | Compatible fitment |
Detailed Engine Compatibility:
| Engine Model | Displacement | Description |
|---|---|---|
| 6BG1 | 6.5L | 6-cylinder diesel engine |
| 6BG1T | 6.5L | 6-cylinder turbo diesel engine |
| 4BG1 | 4.3L | 4-cylinder diesel engine |
| 4BD1 | 3.9L | 4-cylinder diesel engine |
| 6BD1 | 5.8L | 6-cylinder diesel engine |
Important Installation Notes:
- The plunger assembly is the most precision component of the injection pump with a fitting clearance of only 1-2μm — any contamination can cause seizure or wear
- All cylinder plunger assemblies must be replaced simultaneously to ensure consistent fuel injection quantity
- Installation must be performed in a clean environment using special tools — never hammer
- Soak new plunger assemblies in clean diesel and apply clean engine oil before installation
- Calibrate on an injection pump test bench after installation to verify injection quantity and timing
- For 100% accurate fitment, please provide VIN or injection pump model
Features & Benefits
| Feature | Benefit + Verification Signal |
|---|---|
| 10mm Precision Plunger Diameter | Exact match for 6BG1/4BG1 engine injection pump head specifications — ensures correct injection quantity and pressure |
| GCr15 High-Carbon Chromium Bearing Steel | Excellent wear resistance and fatigue strength for high-pressure fuel systems — surface hardness HRC60-64, quenched and precision-ground |
| 1-2 μm Precision Fitting Clearance | Ensures leak-free high-pressure fuel delivery for accurate injection quantity — clearance exceeding 3μm causes pressure drop and power loss |
| ZEXEL OEM Quality | Internationally recognized brand for ISUZU/Hitachi — ZEXEL 131150-4320 equivalent |
| 0.07kg Standard Weight | Exact match to OEM plunger reciprocating inertia — ensures precise injection timing |
| Multiple OE Cross-References | Interchangeable with 9443611853, H131150432, 1311504320 — flexible sourcing |
| Broad Compatibility | Fits ISUZU 6BG1/6BG1T/4BG1/4BD1/6BD1 engines and FTR/ZX230/EX230/EX200-6 |
| 100% Factory Tested | Every plunger assembly undergoes clearance, hardness, and sealing integrity testing — ready to install |
| 12-Month Warranty | Peace of mind on manufacturing defects — free replacement within warranty period |
Quality Control & Verification
| QC Item | Verification Method | Standard |
|---|---|---|
| Plunger Diameter (10mm) | Precision OD gauge | ±0.001mm tolerance |
| Barrel Bore | Precision bore gauge | Fitting clearance 1-2μm |
| Material Composition | Spectrographic analysis | Meets GCr15 bearing steel standard |
| Surface Hardness | Rockwell hardness tester | HRC60-64 |
| Fitting Clearance | Air gauge | 1-2μm |
| Sealing Test | Hydraulic test bench | No leakage at specified pressure |
| Surface Roughness | Roughness tester | Ra≤0.05μm |
| Visual Inspection | 100% visual inspection | No scratches, burrs, or rust |
Installation & Maintenance Recommendations
IMPORTANT: The plunger assembly is the most precision component of the injection pump with a fitting clearance of only 1-2μm. Improper installation may cause plunger seizure, injection pump damage, or engine no-start. Installation should be performed by qualified diesel injection system specialists in a clean environment.
Installation Guidelines (Refer to workshop manual):
- Safety Prep: Disconnect battery negative terminal; clean injection pump exterior to prevent contamination
- Remove Injection Pump: Remove injection pump assembly from engine
- Remove Pump Head: Remove injection pump head; extract old plunger assemblies (mark cylinder positions)
- Clean All Components: Thoroughly clean pump head, plunger barrel bores, and related components in clean diesel
- Inspect Pump Head: Check plunger barrel bores for wear, scoring, or corrosion
- Install New Plunger Assemblies: Soak new plunger assemblies in clean diesel; apply clean engine oil; use special tools to press barrel into pump head (never hammer)
- Install Plunger: Insert plunger into barrel; ensure smooth fit without binding
- Install Pump Head: Install injection pump head; torque to workshop manual specification
- Calibrate Injection Pump: Calibrate injection quantity, timing, and cylinder uniformity on an injection pump test bench
- Install Injection Pump: Reinstall injection pump to engine; connect high-pressure fuel lines
- Bleed System: Start engine; bleed air from fuel system
- Road Test: Perform road test — confirm normal power, no black smoke, no abnormal noise
Maintenance Schedule:
| Item | Interval |
|---|---|
| Fuel Filter Replacement | Every 10,000-20,000 km |
| Injection Pump Inspection | Every 60,000 km or when power loss occurs |
| Plunger Assembly Replacement | Must replace when uneven injection, power loss is found; or during fuel system service |
Packaging & Supply
- Packaging: Anti-rust paper + Plastic box + Carton / Custom packaging
- Packaging Unit: 1 piece/box, packed per customer request
- Unit Weight: 0.07kg
- MOQ: Small orders accepted; volume discounts available
- Delivery Time: 3-7 days (in stock) / 15-30 days (custom)
- Target Customers: Truck parts wholesalers, heavy equipment parts suppliers, diesel injection system repair shops, fleet purchasers, cross-border e-commerce sellers
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