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.

CBCAUTOMOTIVE

RKPage 113

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

AUTOMOTIVERKPage 113

CRACK DETECTION

Visual Inspection Magnetic Particle Inspection (MPI) Magnetic Fluorescent Spray Penetrant Dye Pressure Testing

– On-car– Off-car

CBCAUTOMOTIVE

RKPage 114

CRACK REPAIR

Pinning Cracks Welding Cracks Chemical Crack Repair

– Ceramic block sealers– Epoxy

CBCAUTOMOTIVE

RKPage 115

GASKET INSTALLATION

Follow instructions. Thoroughly clean the mating surface. Match to old gasket. Check for proper fit. Never reuse gaskets.

CBCAUTOMOTIVE

RKPage 118

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.

CBCAUTOMOTIVE

RKPage 119

USING STRAIGHTEDGE

CBCAUTOMOTIVE

RK

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

CBCAUTOMOTIVE

RKPage 120

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.

CBCAUTOMOTIVE

RKPage 122

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

CBCAUTOMOTIVE

RKPage 122

FASTENERS

ID fasteners by– Nominal diameter– Pitch (Threads per

Inch)– Length– Strength

CBCAUTOMOTIVE

RK

THREAD REPAIR

See Handout

CBCAUTOMOTIVE

RK

THREAD REPAIR

See Handout

CBCAUTOMOTIVE

RK