4059460 Oil Cooler Apply to Cummins Engine Isx15 Mkx15

4059460 Oil Cooler Specifications

Primary Application:
✅ Cummins Engine Models:

• ISX15 (2007-2022)

• MKX15 (Mining/Industrial variant)
  ✅ Common Equipment:

• Class 8 trucks (Freightliner Cascadia, Peterbilt 579)

• Mining equipment

• Heavy-duty generators

Key Technical Data

Cross-Reference Numbers

• Cummins OEM: 4059460

• Fleetguard: HF38111

• Dorman: 926-901 (aftermarket)

• API: 146-10032

Critical Compatibility Notes

1. ISX15 Year Split:

   • Fits ALL ISX15 engines (2007+)

   • Replaces older 4087983 cooler

2. MKX15 Specifics:

   • Requires additional vibration dampeners in mining apps

3. Coolant Requirements:

   • MUST use ELC coolant (Extended Life Coolant)

   • Conventional coolant causes premature scaling

Maintenance Indicators

⚠️ Replace When:

• Oil/coolant mixing observed

• ΔP > 15 psi across cooler

• External oil leaks at seams

• Coolant temp > oil temp (indicates clogging)

Common Failure Modes

1. Internal Baffle Collapse (causes oil overheating)

2. Galvanic Corrosion (from mixed coolant types)

3. Vibration Cracking (common in mining applications)

Installation Tips

1. Torque Sequence:

   • 35 lb-ft for mounting bolts

   • 45 lb-ft for port fittings

2. Prime Before Use:

   • Fill coolant side first to avoid air locks

3. Pressure Test:

   • 50 psi air test before engine start

Special Versions:

• 4059460X: Xtreme duty for Arctic operations (-40°F rating)

• 4059460-HD: Heavy-duty brazed construction for vibration

Would you like:

• Cooler efficiency test procedures?

• Troubleshooting flow diagrams?

• Comparison with competitor models?

This oil cooler is critical for maintaining proper lube oil temps – Cummins recommends replacement every 500,000 miles in OTR applications.