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Chapter 10 Engine Disassembly and Cleaning Engine Removal Tips • Clean before beginning removal • Have the tools and equipment before you begin • Always follow removal procedures • Adhere to all safety guidelines • Use a digital camera or camcorder to record various locations and connections Engine Preparation • Once removed, mount securely to an engine stand • Slowly disassemble and visually inspect the parts • Look for excessive wear on moving parts • Always follow the service procedures for proper disassembly and cleaning Cylinder Head Removal • • • • • Remove the intake and exhaust manifolds Remove the valve cover or covers Inspect for sludge Disassemble rocker arm components On OHC engines align timing marks and remove the timing belt Cylinder Head Removal (cont’d) • Keep all pushrods and rocker arm assemblies in exact order • Loosen cylinder head bolts one or two turns following the detorque sequence – often the reverse of the torque sequence • Inspect and save the head gasket Cleaning Engine Parts • After disassembly parts should be thoroughly inspected and cleaned • The cleaning method depends on the component and the equipment available • Incorrect cleaning methods or agents can harm or destroy engine parts Three Basic Cleaning Processes • Chemical Cleaning – Uses a chemical reaction • Thermal Cleaning – Relies on heat to bake off soil • Abrasive Cleaners – Are usually used in conjunction with other cleaning processes Alternative Cleaning Methods • Ultrasonic cleaners uses high-frequency sound waves to clean parts • Citrus chemicals are safer to handle and easier to dispose of • Salt baths use high-temperature molten salt to dissolve carbon, grease, oil, dirt, paint, and some gasket materials Crack Detection Methods • Blocks and heads can be pressurized with air and placed into a water tank • Magnetic particle inspection magnetizes the metal • Dye penetrants are sprayed or brushed on the surface and when dry show cracks ... sequence – often the reverse of the torque sequence • Inspect and save the head gasket Cleaning Engine Parts • After disassembly parts should be thoroughly inspected and cleaned • The cleaning method... component and the equipment available • Incorrect cleaning methods or agents can harm or destroy engine parts Three Basic Cleaning Processes • Chemical Cleaning – Uses a chemical reaction • Thermal Cleaning. .. camera or camcorder to record various locations and connections Engine Preparation • Once removed, mount securely to an engine stand • Slowly disassemble and visually inspect the parts • Look for