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{"title":"ISUZU DMAX 4JA1 T H1 GEAR TIMING 52 8979427551","imgUrl":"https:\/\/img.chinax.com\/nimg\/dc\/8f\/faca408a6e5c150d63ac2adb933f-200x200-1\/isuzu_dmax_4ja1_t_h1_gear_timing_52_8979427551.jpg","attrs":{"Model Number":"DMAX 4JA1 T H1","Place of Origin":"Made in China","Minimum Order Quantity":"5 PCS","Supply Ability":"10000pcs\/month"}}
{"title":"ISUZU NHR 4JA1 DMAX CRANKSHAFT 8944552401","imgUrl":"https:\/\/img.chinax.com\/nimg\/e2\/3f\/ae38ad12211136e0e8ec331c8536-200x200-1\/isuzu_nhr_4ja1_dmax_crankshaft_8944552401.jpg","attrs":{"Brand Name":"YIMI","Supply Ability":"10000pcs\/month","Delivery Time":"15-20 days after deposit","Packaging Details":"1, neutral box , 2, color box, 3, customer brand package"}}
{"title":"ISUZU NKR KY 4JB1 CRANKSHAFT 8944436620 1005011BBA1","imgUrl":"https:\/\/img.chinax.com\/nimg\/ef\/20\/c9299ee3da59c593a2e0493b8470-200x200-1\/isuzu_nkr_ky_4jb1_crankshaft_8944436620_1005011bba1.jpg","attrs":{"Brand Name":"YIMI","Supply Ability":"10000pcs\/month","Delivery Time":"15-20 days after deposit","Packaging Details":"1, neutral box , 2, color box, 3, customer brand package"}}
Numbering Note: This product number is 5123101631 / 5-12310163-1. The series also includes 5123101630 / 5-12310163-0 and 5123101891 / 5-12310189-1. Please verify the specific number based on actual vehicle configuration.
Working Principle
The crankshaft is one of the most heavily loaded components in the engine, connected to the pistons via connecting rods. Its working principle includes:
Power Conversion: During the engine's power stroke, combustion pressure pushes the piston downward, converting reciproing motion into rotational motion through the connecting rod.
Power Output: The crankshaft transmits rotational power through the flywheel to the clutch, transmission, and ultimately to the wheels.
Balance: Counterweights on the crankshaft offset the reciproing inertia of the pistons and connecting rods, reducing engine vibration.
Accessory Drive: The front of the crankshaft drives the timing system, water pump, alternator, A/C compressor, and other accessories via belts/gears.
Failure Symptoms
⚠️ Inspect immediately if any of these occur
Symptom
Probable Cause
Severe engine vibration, especially at specific RPM ranges
Bent crankshaft or damaged counterweights; loss of dynamic balance
Heavy "knocking" sound from engine (main bearing noise)
Worn main bearing journals; excessive main bearing clearance
Bent crankshaft front end or damaged harmonic balancer
Engine fails to start or suddenly stalls
Broken crankshaft; severe internal engine damage
Verifiable Data
✅Product Net Weight: 35.5 kg — verified by ISO-standard bench scale testing.
✅Material Standard: Manufactured from Forged Steel or Ductile Cast Iron — meets ISUZU 4BD1 engine original specifiions.
✅Precision Machined Dimensions: Main journal diameter 80mm, connecting rod journal diameter 64mm, overall length 647.5mm — inspected by CMM, compliant with ISO 2768-m tolerance class.
✅100% Dynamic Balance Tested: Every crankshaft undergoes precision dynamic balance testing before shipment — ensuring smooth high-speed operation and reduced engine vibration.
✅OE Cross-Reference Verified: Replaces OEM numbers 5-12310163-1, compatible with 5-12310163-0, 5123101630, 5123101891, 5-12310189-1 and other numbers.
✅Certifiion: CE certified.
✅Warranty: 1 year.
✅HS Code: 848310000.
OE Cross-Reference
Type
Number
ISUZU OEM
5123101631 / 5-12310163-1
Same Series
5123101630 / 5-12310163-0
Alternative
5123101891 / 5-12310189-1
Related
5-12310-163-1, 5-12310-163-0
Product Specifiions
Part Number:
5123101631 5-12310163-1
Product Name:
Crankshaft
Car Model:
NPR59
Engine Model:
4BD1
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 Vehicle Appliions:
Brand
Model
Chassis
Engine
Notes
ISUZU
NPR59
NPR59
4BD1
Light/medium-duty truck
ISUZU
NPR
NPR
4BD1
Light/medium-duty truck
ISUZU
NQR
NQR
4BD1
Medium-duty truck
ISUZU
NKR
NKR
4BD1
Light-duty truck
ISUZU
NHR
NHR
4BD1
Light-duty truck
Important Fitment Warnings
Number Confirmation: This product number is 5123101631 / 5-12310163-1. The series also includes 5123101630 / 5-12310163-0 and 5123101891 / 5-12310189-1. Verify the specific number on the engine nameplate before ordering.
Associated Components: When replacing the crankshaft, it is recommended to replace main bearings, connecting rod bearings, and front/rear crankshaft seals simultaneously — ensures reliability and service life after engine overhaul.
Installation Torque: Refer to ISUZU 4BD1 engine factory workshop manual for main bearing cap and connecting rod bolt torque specifiions.
Bearing Selection: Crankshaft journal sizes are available in standard (STD) and oversized (0.25mm, 0.50mm, etc.) grades. Measure actual journal dimensions before selecting bearings.
Professional Installation: Crankshaft replacement is a core engine overhaul procedure requiring complete engine disassembly and reassembly. Must be performed by a qualified engine repair technician.
Features & Benefits
High-Quality Forged Steel/Ductile Cast Iron Material
Excellent fatigue strength and wear resistance for long-term reliable operation under high-speed, high-load conditions — suitable for ISUZU 4BD1 4.0L diesel engine and Hitachi excavator appliions.
Ensures precise fit with main and connecting rod bearings — provides stable rotational support and proper lubriion clearance — inspected by CMM, compliant with ISO 2768-m tolerance class.
100% Dynamic Balance Tested
Every crankshaft undergoes precision dynamic balance testing — ensures smooth high-speed engine operation; significantly reduces vibration and noise; extends engine service life.
CE Certified & 1-Year Warranty
Internationally recognized quality certifiion ensuring compliance with European safety, health, and environmental standards — CE certified; reliable after-sales protection — 1-year quality guarantee.
Broad OEM Cross-Compatibility
Replaces OEM numbers 5123101631 / 5-12310163-1; compatible with 5123101630, 5123101891 and other numbers — fits NPR59, NPR, NQR, NKR trucks and Hitachi EX100/EX120 excavators.
Packaging & Supply
Packaging
Neutral packaging or customized per customer request
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 ...
