| Description and Operation CAUTION:When repairing engines, all parts must be contamination free. If contamination/foreign material is present when repairing an engine, premature engine failure can occur. NOTE:Specifications show the expected minimum or maximum condition. Refer to the appropriate section in Group 303 for the procedure. NOTE:If a component fails to meet the specifications, it is necessary to refinish it or install a new component. Wear limits are provided as an aid to determine if the component can be refinished. A new component must be installed when any component fails to meet specifications and cannot be refinished. NOTE:This section contains information, steps and procedures that may not be specific to your engine. This section covers general procedures and diagnosis and testing of the engine system, except for exhaust emission control devices. Refer to the diagnostic scan tool to diagnose the system. The engine incorporates the following features: Refer to the appropriate section in Group 303 for the procedure. - Crankcase ventilation or breather system
- Exhaust emission control system
- Evaporative emission control system
Some engines incorporate a fail-safe cooling system. Refer to the appropriate section in Group 303 for the procedure. The engine, fuel system, ignition system, emissions system and exhaust system all affect exhaust emission levels and must be maintained according to the maintenance schedule. Refer to the scheduled Maintenance Guide. Correct engine identification is required to order parts. Refer to the appropriate section in Group 303 for the procedure. For complete vehicle and engine identification codes, refer to Section 100-01 Identification Codes. | 
