Series 50 – Section 13.6 Preventive Maintenance for the Series 50G Engine (City Transit Coach)

Section 13.6
Preventive Maintenance for the Series 50G Engine (City Transit Coach)

The following is a list of items that are unique to the Series 50G engine for preventive maintenance (city transit coach):‪

Section 13.6.1
Coalescing Fuel Filters

Drain coalescing fuel filters daily. Inspect natural gas fuel filter every 6,000 miles (9,600 km). Replace fuel filter if dirt, debris or foreign objects are present “inside” of the fuel filter. Also, replace if fuel filter seal is damaged. ‪

Note: Oil saturation on the outside of the fuel filter is a NORMAL condition of the oil coalescing process.

Section 13.6.2
Valve Lash

Check valve lash. Valve lash should be inspected and adjusted every 60,000 miles (96,000 km) as specified.‪

Section 13.6.3
Closed Crankcase Breather System

The closed crankcase breather filter must be replaced every 6,000 miles (9,600 km). The filter is located in the remote mounted crankvent assembly.‪

Section 13.6.4
Dry Type Air Cleaner

Under no operating condition should the intake restriction exceed 20 inches of water at full load and rated speed. A clogged air cleaner element will cause excessive intake restriction and a reduced air supply to the engine. For equivalent restriction limits for lower speed, refer to Detroit Diesel Corporation Engineering Bulletin No. 39, "Air Cleaner Systems for Detroit Diesel Engines".‪

Inspect the air cleaner element every 12,000 miles (19,300 km) (coaches). Inspect the air cleaner at 5,000 miles (8,000 km) if the engine is operated under severe dust conditions. Replace the element if necessary. Check the gaskets for deterioration and replace, if necessary. If the dry type air cleaner is equipped with an aspirator, check for aspirator damage or clogging. Clean and repair as necessary.‪

Section 13.6.5
Engine Lubricating Oil

Change the lubricating oil every 6,000 miles (9,600 km) for city transit coaches. (Refer to Engine Requirements - Lubricating Oil, Fuel and Filters - 7SE272).‪

Section 13.6.6
Engine Lubricating Oil Filters

Change the lubricating oil filters at each oil change 6,000 miles (9,600 km) for city transit coaches).‪

Section 13.6.7
Coolant

Check the coolant level daily before starting the engine. Make sure coolant is up to the proper level. Add coolant as necessary. DO NOT OVERFILL. Check all cooling system lines and hoses for damage, leaks or loose connections. Tighten or replace as necessary. (Refer to Coolant Selections for Detroit Diesel Engines 7SE298). Check for proper inhibitor level at each oil change 15,000 miles (24,000 km ) and add as required or 6,000 miles (9,600 km) (coaches).‪

Section 13.6.8
Turbocharger and Wastegate Assembly

Inspect turbocharger mountings, air intake and exhaust ducts, recirculation valve assembly, and wastegate valve assembly, including hoses, for leaks. Check the oil and water inlet and outlet lines and connections for leaks and restrictions to flow. Check for unusual vibrations or noises. If excessive, remove unit from service and have cause corrected.‪

Section 13.6.9
Turbocharger Compressor Recirculation Valve

Every 18,000 miles (28,900 km), vacuum check the turbocharger compressor recirculation valve for leakage per the service manual. If the valve assembly does not hold the vacuum specified, the valve needs to be disassembled and inspected for defective components.‪

Section 13.6.10
Thermostat

Check thermostats and seals every 108,000 miles (173,800 km) (coach). Replace the seals and/or thermostat, if necessary.‪

Section 13.6.11
Spark Plugs

Replace the spark plugs and boot spring assembly every 24,000 miles (28,600 km) (coach); refer to "15.5 Ignition Boot" and refer to "15.10 Spark Plugs" for plug information.‪

Section 13.6.12
Spark Plug Ignition Wires

Inspect spark plug wires at spark plug change interval for cracks and/or deterioration, and for proper routing. Replace wires at 108,000 (173,800 km) miles (coach).‪