S4S 171647 171657 171707 171721 Engine Crankshaft Compatible with Mitsubishi

1. Product Overview & Wholesale Price Range

The S4S Forged Steel Engine Crankshaft (OEM Part # 171647 / 171657 / 171707 / 171721) is the core rotating power part for S4S diesel engine, designed for long‑time heavy‑load working condition of forklift and industrial equipment.

• Factory Wholesale Price: $310 – $620 USD Direct factory price for engine repair workshops
• Material Specifications: High‑strength forged steel, journals with high‑frequency induction hardening, good wear‑resistance and anti‑fatigue property
• MOQ & Bulk Discount: 1 Unit, favorable price for full‑set engine overhaul bulk orders
• Lead Time: 1‑3 working days, sufficient warehouse stock for worldwide logistics
• Warranty: 12‑month warranty, dynamic balance testing and magnetic particle crack inspection before packing

2. Application Scenarios

Specially produced for high‑torque heavy‑load operation:

• Forklift Repair: Direct replacement for worn, scored or fractured original crankshaft during S4S forklift engine overhaul.
• Construction & Industrial Machinery: Matches machinery equipped with S4S diesel engine, reduce engine vibration and prolong bearing service life.
• Engine Rebuild Workshop: Strict original dimension standard, no modification required for installation.
• Global Parts Distributor: Stable batch supply, complete QC records to support overseas resale business.

3. Common Crankshaft Failure Reference

• Fault 1: Journal Scoring & Wear Groove
  Cause: Dirty lubricating oil, metal impurities scratch shaft journal surface.
  Solution: Install brand‑new S4S forged crankshaft, replace oil filter and clean oil circuit synchronously.
• Fault 2: Main Bearing Burn‑out & Engine Knocking Sound
  Cause: Long‑time overload operation leads to bearing clearance out of tolerance.
  Solution: Fit new S4S crankshaft together with matched main and connecting rod bearing shells.
• Fault 3: Crankshaft Fatigue Crack Risk
  Cause: Engine overloading and sudden mechanical impact load.
  Solution: Our reinforced forged S4S crankshaft, every unit pass non‑destructive crack detection before shipment.
• Fault 4: Front & Rear Oil Seal Persistent Oil Leakage
  Cause: Oil seal journal surface forms wear groove, oil leakage still occurs after changing oil seals.
  Solution: Replace complete new crankshaft together with high‑quality oil seal kits.

4. Related Engine Spare Parts Recommendation

5. Frequently Asked Questions

Q1: How do I confirm this S4S crankshaft fits my engine?
A: Confirm your engine model is S4S, cross‑check OEM casting numbers 171647,171657,171707,171721. Send engine serial number for quick fitment confirmation.

Q2: What is the production process for this crankshaft?
A: It is forged steel crankshaft, main and rod journals are high‑frequency induction hardened to improve wear resistance for heavy‑load working environment.

Q3: What quality inspection before shipment?
A: Each S4S crankshaft undergoes dimension inspection, dynamic balance test and magnetic particle crack inspection before packing to avoid hidden defects.