Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:13:p25
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 13 (pt 25/27)
Character Range: 706479–709935

This maintenance schedule may be updated as necessary throughout the service accumulation schedule provided that no maintenance operation is deleted from the maintenance schedule after the operation has been performed on the test engine.
              4.1.2. The engine manufacturer shall specify for the service accumulation schedule the adjustment, cleaning and maintenance (where necessary) and scheduled exchange of the following items:
              (a) Filters and coolers in the exhaust gas re-circulation system;
              (b) Positive crankcase ventilation valve, if applicable;
              (c) Fuel injector tips (cleaning only);
              (d) Fuel injectors;
              (e) Turbocharger;
              (f) Electronic engine control unit and its associated sensors and actuators;
              (g) Particulate after-treatment system (including related components);
              (h) deNOx system;
                  (i) Exhaust gas re-circulation system, including all related control valves and tubing;
              (j) Any other exhaust after-treatment system.
              4.1.3. Critical emission-related scheduled maintenance shall only be performed if being performed in-use and being communicated to the owner of the vehicle.
              4.2. Changes to scheduled maintenance
              4.2.1. The manufacturer shall submit a request to the Type Approval Authority for approval of any new scheduled maintenance that it wishes to perform during the service accumulation schedule and subsequently recommend to owners of engines.or vehicles. The request shall be accompanied by data supporting the need for the new scheduled maintenance and the maintenance interval.
              4.3. Non-emission-related scheduled maintenance
              4.3.1. Non-emission-related scheduled maintenance which is reasonable and technically necessary such as oil change, oil filter change, fuel filter change, air filter change, cooling system maintenance, idle speed adjustment, governor, engine bolt torque, valve lash, injector lash, timing, adjustment of the tension of any drive-belt, etc may be performed on engines or vehicles selected for the service accumulation schedule at the least frequent intervals recommended by the manufacturer to the owner.
              4.4. Repair
              4.4.1. Repairs to the components of an engine selected for testing over a service accumulation schedule other than the engine emission control system or fuel system shall be performed only as a result of component failure or engine system malfunction.
              4.4.2. If the engine itself, the emission control system or the fuel system fail during the service accumulation schedule, the service accumulation shall be considered void, and a new service accumulation shall be started with a new engine system.

Annex 8 Conformity of in-service engines or vehicles
1. Introduction
              1.1 This annex sets out requirements for checking and demonstrating the conformity of in-service engines and vehicles.
              2. Procedure for in-service conformity
              2.1. The conformity of in-service vehicles or engines of an engine family shall be demonstrated by testing vehicles on the road operated over their normal driving patterns, conditions and payloads. The in-service conformity test shall be representative for vehicles operated on their real driving routes, with their normal payload and with the usual