SEALING the ENGINE

1
SEALING the ENGINE

• Chapter 5
• Classroom Manual
• Page95
• Lab Manual
• Page 113

CBC AUTOMOTIVE RK
2
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.

CBC AUTOMOTIVE RK
Page 113
3
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 AUTOMOTIVE RK
Page 113
4
CRACK DETECTION

• Visual Inspection
• Magnetic Particle Inspection (MPI)
• Magnetic Fluorescent
• Spray Penetrant Dye
• Pressure Testing
• On-car
• Off-car

CBC AUTOMOTIVE RK
Page 114
5
CRACK REPAIR

• Pinning Cracks
• Welding Cracks
• Chemical Crack Repair
• Ceramic block sealers
• Epoxy

CBC AUTOMOTIVE RK
Page 115
6
GASKET INSTALLATION

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

CBC AUTOMOTIVE RK
Page 118
7
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.

CBC AUTOMOTIVE RK
Page 119
8
USING STRAIGHTEDGE
CBC AUTOMOTIVE RK
9
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

CBC AUTOMOTIVE RK
Page 120
10
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.

CBC AUTOMOTIVE RK
Page 122
11
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

CBC AUTOMOTIVE RK
Page 122
12
FASTENERS

• ID fasteners by
• Nominal diameter
• Pitch (Threads per Inch)
• Length
• Strength

CBC AUTOMOTIVE RK
13
THREAD REPAIR

• See Handout

CBC AUTOMOTIVE RK
14
THREAD REPAIR

• See Handout

CBC AUTOMOTIVE RK