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ISUZU NKR NPR King Pin Kit 5878309780 5-87830978-0 KP-231 OEM Fit
Product Overview
King Pin Kit 5878309780 5-87830978-0 KP-231 MI-08 for ISUZU NKR NPR ELF 4JB1 — Verified OEM Fit Φ30*188 mm Steering Knuckle Repair Kit
The King Pin Kit with OEM numbers 5878309780 and 5-87830978-0 — also referenced as KP-231 / MI-08 — is a verified direct-fit replacement for ISUZU NKR / NPR / ELF light trucks equipped with the 4JB1 diesel engine. This king pin kit is a critical steering knuckle component that connects the front axle to the steering knuckle, allowing the front wheels to pivot for steering while supporting the vehicle's weight.
Working Principle
The king pin kit serves as the pivot point for the steering knuckle on the front axle. It allows the knuckle to rotate for steering while maintaining precise alignment between the axle beam and the knuckle assembly. The king pin must withstand both vertical loads (vehicle weight) and horizontal loads (steering forces, braking forces, and road impacts). The ISUZU NKR/NPR front axle uses a Φ30*188 mm king pin with thrust bearings at the top and bushings at the bottom to support the knuckle.
Failure Symptoms
Steering wander or excessive steering play — worn king pin bushings allow the knuckle to move, causing the vehicle to wander on straight roads
Uneven or accelerated front tire wear — misaligned knuckle geometry from worn king pins causes cupping or scalloped tire wear patterns
Front end shimmy or vibration — loose king pins allow the front wheels to oscillate at certain speeds
Hard steering or binding — seized or corroded king pins prevent smooth steering operation
Clunking or knocking noise from the front axle — excessive clearance between the king pin and bushings causes metal-to-metal contact
Critical Inspection Note: ISUZU service manuals require that the king pin be replaced, never reused, when the knuckle is removed. Always replace king pins, bushings, bearings, and seals as a complete kit. Inspect the axle beam king pin bore for wear or elongation — if damaged, the axle beam must be replaced.
Technical Specifications
Verification Item
Data / Standard
Source / Method
Part Number (Short)
5878309780
ISUZU OEM Parts Database
Part Number (Long)
5-87830978-0
ISUZU OEM Parts Database
Model Number
KP-231 / MI-08
Product specification
Vehicle Models
ISUZU NKR / NPR / ELF / NHR / 100P / 600P
ISUZU application catalog
Engine Compatibility
4JB1 / 4HF1 / 4BC2
ISUZU application catalog
King Pin Size
Φ30 * 188 mm
Product specification
King Pin Material
SAE 1045 / 40Cr Alloy Steel
Material certificate
Hardness
HRC 55–63
Hardness testing
Weight (per kit)
2.99 kg
Product specification
Certification
ISO/TS 16949
Third-party system audit
Product Image
Part Number:
5878309780 5-87830978-0
Product Name:
King Pin Kit
Car Model:
NKR NPR
Engine Model:
NKR NPR
Condition:
100% Brand New
Material:
High-strength aluminum alloy & precision bearings
Vehicle Compatibility
Brand
Model
Chassis
Engine
Years
ISUZU
ELF
NKR
4JB1 / 4BC2
1982–1993
ISUZU
ELF
NKR55
4JB1
1996–2007
ISUZU
NPR
NPR
4JB1 / 4HF1
1986–1998
ISUZU
NHR
NHR54
4JB1
1984–1990
JMC
1030 / 1040
—
4JB1
—
Important Fitment Notes:
This king pin kit fits the Φ30*188 mm king pin bore. Confirm the king pin diameter and length against your original component before ordering
The king pin bushing bore in the steering knuckle may have worn oversized. Measure the knuckle bore before ordering to determine whether a standard or oversize kit is required
For right-hand drive (RHD) vehicles, verify clearance and orientation
Features & Benefits
Feature
Benefit + Verification Signal
SAE 1045 / 40Cr Alloy Steel King Pin
High hardness (HRC 55–63) and tensile strength for reliable steering pivot under heavy loads — verified by material certificate and hardness testing
Precision-Ground Φ30*188 mm
Exact fit in the ISUZU NKR/NPR steering knuckle — direct drop-in installation without modification — verified by CMM dimensional inspection
Complete Kit Coverage
Includes king pins, bushings, thrust bearings, seals, lock pins, grease fittings, and snap rings — all components needed for a professional king pin replacement
Grease Fitting Included
Allows regular lubrication to extend king pin and bushing service life — verified by component inspection
ISO/TS 16949 Quality System
Full traceability with material certificates and batch inspection reports — third-party certified
Installation Guidelines
IMPORTANT: King pin replacement is a professional-level steering system repair. It must be performed by a qualified technician in a clean workshop. Always replace king pins, bushings, bearings, and seals as a complete kit. Never reuse old king pins.
Recommended Torque Values
Fastener
Torque
King Pin Lock Pin Lock Nut
18.63–30.41 N·m (13.75–22.43 lb ft)
King Pin Cover Plate Bolts (M8)
25 N·m (20 lb ft)
Steering Arm Retaining Bolts
45 N·m (33 lb ft)
Maintenance Schedule
Every 10,000 km: Grease king pins through the grease fittings. Check for steering play
Every 40,000–50,000 km: Inspect king pin bushings for wear. Check steering knuckle for excessive play
When steering play is detected: Inspect king pins immediately. Replace if wear is beyond specification
At any steering system repair: Always replace king pins, bushings, bearings, and seals as a complete kit
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 ...
