1. SEALING the ENGINE n Chapter 5 n Classroom Manual –Page95 n Lab Manual –Page 113 CBC AUTOMOTIVE RK

2. OBJECTIVES n Locate cracks in castings. n Explain process of repairing cracks by welding. n Properly install common engine gaskets including cyl. head & valve cover gaskets. n Properly install typical lip seals. n Extract broken fasteners. n Perform thread repair. CBC AUTOMOTIVE RK Page 113

3. INTRODUCTION n Cracked castings - Repair or Replace? n Other causes of leakage, –Worn or damaged seals –Gaskets n Threaded holes can be damaged from, –Improper torquing –Corrosion CBC AUTOMOTIVE RK Page 113

4. CRACK DETECTION n Visual Inspection n Magnetic Particle Inspection (MPI) n Magnetic Fluorescent n Spray Penetrant Dye n Pressure Testing –On-car –Off-car CBC AUTOMOTIVE RK Page 114

5. CRACK REPAIR n Pinning Cracks n Welding Cracks n Chemical Crack Repair –Ceramic block sealers –Epoxy CBC AUTOMOTIVE RK Page 115

6. GASKET INSTALLATION n Follow instructions. n Thoroughly clean the mating surface. n Match to old gasket. n Check for proper fit. n Never reuse gaskets. CBC AUTOMOTIVE RK Page 118

7. CYLINDER HEAD GASKET n Must be capable of withstanding tremendous heat and pressure. n Follow gasket makers instructions on whether or not to use sealant. n What type of sealant and how much? n Run thread chaser in bolt holes. CBC AUTOMOTIVE RK Page 119

8. USING STRAIGHTEDGE CBC AUTOMOTIVE RK

9. VALVE COVER GASKETS n Check cover flanges for straightness. n Use load spreaders when available. n Use sealants only when necessary and not to much. See P5-8 CBC AUTOMOTIVE RK Page 120

10. SEAL INSTALLATION n Install with lip (and garter spring) toward liquid. n Lubricate lip before installation. n Use sealant on the outside of steel seals. n Use a seal installer. CBC AUTOMOTIVE RK Page 122

11. USING SEALANTS n Use proper sealant for application. n Do not use sealants unless specified in service manual or by gasket manufacturer. n Types of sealants –Hard drying –Aerobic (RTV) –Anaerobic CBC AUTOMOTIVE RK Page 122

12. FASTENERS n ID fasteners by –Nominal diameter –Pitch (Threads per Inch) –Length –Strength CBC AUTOMOTIVE RK

13. THREAD REPAIR n See Handout CBC AUTOMOTIVE RK

14. THREAD REPAIR n See Handout CBC AUTOMOTIVE RK