The lubrication system in Detroit Diesel Series 60 engines is critical for reducing friction, maintaining optimal operating temperatures, and ensuring the longevity of engine components. The system operates by distributing oil to the engine’s moving parts, which includes bearings, pistons, and gears, through a network of galleries, pumps, and filters.

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Key components of this system include:

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• Oil Pump
• Pressure Regulator Valve
• Pressure Relief Valve
• Oil Filters
• Oil Cooler
• Oil Level Dipstick
• Oil Pan
• Ventilation System

The schematic flow of oil starts at the pump, proceeds through filters and coolers, and ends with the oil’s return to the pan after circulating through the engine’s lubrication points.

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Schematic of Lubrication Flow

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Oil is drawn from the pan by the gear-driven oil pump and forced through full-flow filters and an optional bypass filter. The cleaned oil then flows into the oil cooler before entering the main galleries. From there, oil is distributed to:

• Camshaft bearings
• Crankshaft bearings
• Rocker arms
• Turbocharger
• Pistons

Any bypassed oil or overflow is directed back to the oil pan, completing the cycle.

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Components and Functions

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Oil Pump

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The gear-driven oil pump ensures consistent oil flow and pressure. Located at the front of the engine and driven by the crankshaft, the pump’s internal helical gears draw oil from the pan and force it through the lubrication system.

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Removal and Installation

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1. Drain the oil from the pan.
2. Loosen and remove bolts securing the pump.
3. Detach the inlet and outlet pipes.
4. Reverse the process for installation, ensuring all components are torqued correctly.

Inspection and Repair

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• Inspect bushings and gears for wear.
• Replace components if clearances exceed 0.089 mm (0.0035 in.).
• Test the assembled pump for smooth rotation.

Specifications and Tolerances

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• Drive gear clearance: 0.051–0.229 mm (0.002–0.009 in.).
• Endplay: 0.084–0.112 mm (0.0033–0.0044 in.).
  

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Oil Pressure Regulation

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Pressure Regulator Valve Operation

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This valve ensures oil pressure remains stable regardless of temperature or engine load. It opens at 310 kPa (45 psi), redirecting excess oil to the pan.

Relief Valve Details The pressure relief valve is designed to prevent overpressure by opening at 724 kPa (105 psi), ensuring safe operation under all conditions.

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Repair and Replacement

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• Replace springs and valves if signs of pitting or binding are found.
• Clean components with fuel oil and inspect for wear.
  

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Oil Filters

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Types of Filters

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• Full-Flow Filters: Remove contaminants from all circulating oil.
• Bypass Filters: Add extra filtration for finer particles.
  

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Replacement Intervals and Techniques

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• Replace filters every 24,000 km (15,000 miles) for trucks.
• Coat the seals of new filters with clean oil before installation.
  

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Oil Cooler

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Function and Design Variations

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The oil cooler maintains oil within the optimal temperature range. Post-1991 designs include a bypass feature for situations where the cooler becomes obstructed.

Cleaning and Inspection

• Clean cores using alkaline solutions or Tech Solv 340.
• Inspect for leaks using a pressurized air test at 75–100 psi.

Installation Procedures

• Replace O-rings and gaskets.
• Tighten bolts in the correct sequence to 30-38 Nm (22-28 ft-lb).

For complete maintenance, always verify installation correctness by referencing torque specifications and operating parameters. Using quality aftermarket parts like those from Diesel Pro Power can ensure reliability and performance.