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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)
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):
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
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
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 ...
