Diesel Engine Parts, Products

1. Basic Parameters

• Part Number: 3916369 (OEM)
• Application: Cummins 6CT / 6CTA / ISC / ISL series diesel engines
• Thread: M14 × 2 (metric)
• Material: High-strength alloy steel
• Grade: 12.9 (high tensile strength)
• Type: Hexagon head bolt (main bearing cap bolt)
• Length: ~105–110 mm
• Weight: ~0.3–0.35 kg

2. Function

• Secure Main Bearing Caps: Fastens the crankshaft main bearing caps to the engine cylinder block.
• Withstand Heavy Loads: Resists high engine pressure, vibration, and crankshaft rotational forces.
• Maintain Alignment: Ensures precise positioning of the crankshaft and bearings.
• Seal & Stability: Maintains tight sealing between caps and block to prevent oil leaks.

3. Installation Position

• Location: Inside the engine block, main bearing journals (crankshaft supports).
• Position: Mounted on the main bearing caps (1 to 7 positions for 6-cylinder engines).
• Qty per Engine: 14 bolts (2 per cap × 7 caps).
• Installation Steps:
  1. Lubricate threads with clean engine oil.
  2. Install caps in numbered sequence (front to rear).
  3. Torque to 180–190 Nm (133–140 ft-lb).
  4. Tighten in 3–4 stages (gradual torque increase).

4. Key Notes

• Critical Part: Must be replaced if damaged/stretched (never reuse).
• Torque Spec: Follow manufacturer’s exact torque sequence.
• Fitment: Compatible with Cummins 6CT, 6CTA, ISC, ISL engines.