1. What is a Crankshaft Part Number?

A crankshaft part number is a unique identifier assigned by manufacturers, typically composed of numbers, letters, or symbols (e.g., GM 12637325, Cummins 3917320). These numbers follow specific coding rules:

• Prefix: Indicates part type (e.g., Cummins 39 denotes engine components)

• Middle Segment: Correlates to engine model/platform (e.g., 6373 in GM 12637325 refers to 5.3L V8 engines)

• Suffix: Marks version iterations (e.g., -1, A, B for design improvements)

Core Functions: Decode material specifications (e.g., ductile iron QT700-2), process features (e.g., counterweight design), and compatibility parameters (e.g., cylinder count/displacement).

2. Where to Find Crankshaft Part Numbers? (with Search Guides)

1. On the Crankshaft Itself (Requires Engine Disassembly)

• Common Locations: Main journal end face, crank arm inner side (e.g., Cummins ISB crankshafts engrave 3917320 on the 3rd crank arm)

• Marking Types: Laser etching/steel stamping (depth ≥0.5mm for wear resistance)

2. Engine Nameplate (Directly Viewable in the Engine Bay)

Typical Positions: Cylinder block side, valve cover inner surface

Information Example:

Engine Model: 4JB1-TCPart 
Number: 8-94455-240-1Production 
Date: 2023.05

3. Vehicle Manuals (Including Electronic Versions)

• Paper Manuals: Service Manual → "Engine Components" chapter

• Electronic Inquiry: Scan the QR code in the manual, enter VIN to get the part number

4. Part Packaging (Included with New Parts)

Label Content:

Part Number: 5261376Compatible 
Engine: Cummins 
X15Material: Ductile Iron QT800-3
Certification: ISO/TS 16949

3. Why Are Crankshaft Part Numbers Important? (Data-Supported)

1、Compatibility Assurance

Incorrect part numbers cause 18% of engine failures (Source: 2023 report by the American Automobile Maintenance Association). For example:

• Fitting an Isuzu 8-94455-240-1 crankshaft (for naturally aspirated engines) to a turbocharged model increases crankshaft fracture risk by 3x due to pressure differences.

2、Repair Efficiency Enhancement

Using accurate part numbers reduces part matching time from an average of 4 hours to 20 minutes (measured by a chain repair enterprise).

3、Supply Chain Traceability

Part numbers allow querying:

• Production batches (e.g., GM 55574335 batch 15 in 2022 uses improved heat treatment)

• Logistics tracking (avoids refurbished parts)

4. How to Find Crankshaft Part Numbers? (Scenario-Based Guides)

Scenario 1: Vehicle Owners (No Professional Tools)

• Check Vehicle Registration/Purchase Contract

  Obtain the "engine model" (e.g., Volkswagen EA888 Gen3)

• Search via WeChat

  (e.g., "BMW China Parts Inquiry" official account → enter engine model → get part number)

• Contact Authorized Dealerships

  Provide the VIN (e.g., LBV5Z2107MS001234) for direct query by customer service

Scenario 2: Professional Mechanics

▶ Method 1: Diagnostic Tool Reading (for Electronic Engines)

• Connect OBD scanner (e.g., MS908)

• Access "Engine System" → "Component Information" → "Crankshaft Part Number" (e.g., read Hyundai 23110-2E000)

▶ Method 2: Cross-Brand Database Query (Taking RockAuto as an Example)

1、Visit the website → select "Engine Parts" → "Crankshaft"

3、Enter parameters:

Brand: Isuzu

Model: NPR 2018

Engine: 4HK1-TC

3、System matches the part number: 8-97033-171-2 (with price comparisons from 3 suppliers)

▶ Method 3: Serial Number Reverse Query (for High-Performance Crankshafts)

Example: A racing crankshaft with serial number "CR-2023-001"

Log in to the manufacturer's website → "Technical Support" → "Serial Number Query" → enter the number → obtain part number MD173163 and performance parameters

5. How to Purchase Based on Part Numbers? (Anti-Counterfeit Guide)

1. Channel Comparison

2. Three-Step Authenticity Verification

• Check Engraving: OEM parts have uniform engraving depth (0.3-0.5mm); counterfeits may be blurry or uneven

• Verify Certification Labels: Regular parts must include ISO/TS 16949 certification labels (scannable for verification)

• Compare Weight Tolerance: OEM crankshafts have a weight tolerance ≤±0.5kg (e.g., Cummins 3917320 standard weight: 28.5kg)

6. Quick Reference Table for Common Brands' Part Numbers

Blog Author Profile

DAWN | Pig Iron & Castings Procurement Advisor
18 years in the foundry trenches give me an edge: I know how pig iron’s chemistry impacts casting quality and can troubleshoot defects like cracks and porosity. With a 1M MT/year pig iron and 60k MT/year casting output from our in-house factory, plus 200+ verified suppliers on our platform, we offer fast price comparisons. Expect a 24-hour inquiry response—my goal? Not just closing deals, but being your go-to partner in the foundry world.

📧(zbw@tiegu.net)