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SEALING the ENGINE
Chapter 5 Classroom
Manual– Page95
Lab Manual– Page 113
CBCAUTOMOTIVE
RK
OBJECTIVES Locate cracks in castings. Explain process of repairing cracks by
welding. Properly install common engine gaskets
including cyl. head & valve cover gaskets. Properly install typical lip seals. Extract broken fasteners. Perform thread repair.
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INTRODUCTION
Cracked castings - Repair or Replace? Other causes of leakage,
– Worn or damaged seals– Gaskets
Threaded holes can be damaged from,– Improper torquing– Corrosion CBC
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CRACK DETECTION
Visual Inspection Magnetic Particle Inspection (MPI) Magnetic Fluorescent Spray Penetrant Dye Pressure Testing
– On-car– Off-car
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CRACK REPAIR
Pinning Cracks Welding Cracks Chemical Crack Repair
– Ceramic block sealers– Epoxy
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GASKET INSTALLATION
Follow instructions. Thoroughly clean the mating surface. Match to old gasket. Check for proper fit. Never reuse gaskets.
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CYLINDER HEAD GASKET
Must be capable of withstanding tremendous heat and pressure.
Follow gasket makers instructions on whether or not to use sealant.
What type of sealant and how much? Run thread chaser in bolt holes.
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USING STRAIGHTEDGE
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VALVE COVER GASKETS
Check cover flanges for straightness. Use load spreaders when available. Use sealants only when necessary and
not to much. See P5-8
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SEAL INSTALLATION
Install with lip (and garter spring) toward liquid.
Lubricate lip before installation. Use sealant on the outside of steel
seals. Use a seal installer.
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USING SEALANTS
Use proper sealant for application. Do not use sealants unless specified in
service manual or by gasket manufacturer.
Types of sealants– Hard drying– Aerobic (RTV)– Anaerobic
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FASTENERS
ID fasteners by– Nominal diameter– Pitch (Threads per
Inch)– Length– Strength
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THREAD REPAIR
See Handout
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THREAD REPAIR
See Handout
CBCAUTOMOTIVE
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