Service manual

− Abrasive pads also produce a fine grit that
the oil filter cannot remove from the
engine oil.
This fine grit is an abrasive and can cause
internal engine damage.
Assembling Components
• Assemble components using only the sealant (or
equivalent) that is specified in the service
procedure.
• Sealing surfaces must be clean and free of debris
or oil.
• Specific components such as crankshaft oil seals
or valve stem oil seals may require lubrication
during assembly.
• Components requiring lubrication will be identified
in the service procedure.
• Apply only the amount of sealant specified in the
service procedure to a component.
• Do not allow the sealant to enter into any blind
threaded holes, as the sealant may prevent
the fastener from clamping properly or cause
component damage when tightened.
Important: Do not overtighten the fasteners.
• Tighten the fasteners to the proper specifications.
Use of RTV and Anaerobic Sealer
SIE-ID = 411537
Sealant Types
Important: The correct sealant and amount of sealant
must be used in the proper location to prevent oil
leaks, coolant leaks, or the loosening of the fasteners.
DO NOT interchange the sealants. Use only the
sealant, or equivalent, as specified in the service
procedure.
The following 2 major types of sealant are commonly
used in engines:
• Aerobic sealant Room Temperature
Vulcanizing (RTV)
• Anaerobic sealant, which include the following:
− Gasket eliminator
− Pipe
− Threadlock
Aerobic Type Room Temperature
Vulcanizing (RTV) Sealant
Aerobic type Room Temperature Vulcanizing (RTV)
sealant cures when exposed to air. This type of sealant
is used where 2 components, such as the intake
manifold and the engine block, are assembled
together.
Use the following information when using RTV
sealant:
• Do not use RTV sealant in areas where extreme
temperatures are expected. These areas include:
− The exhaust manifold
− The head gasket
− Any other surfaces where a different type of
sealant is specified in the service procedure
• Always follow all the safety recommendations and
the directions that are on the RTV sealant
container.
• Use a plastic or wood scraper in order to remove
all the RTV sealant from the components.
Notice: SIO-ID = 68592 Do not allow the RTV sealant
to enter any blind threaded hole. RTV sealant that
is allowed to enter a blind threaded hole can cause
hydraulic lock of the fastener when the fastener
is tightened. Hydraulic lock of a fastener can lead to
damage to the fastener and/or the components.
Hydraulic lock of a fastener can also prevent the
proper clamping loads to be obtained when the
fastener is tightened. Improper clamping loads can
prevent proper sealing of the components allowing
leakage to occur. Preventing proper fastener tightening
can allow the components to loosen or separate
leading to extensive engine damage.
• The surfaces to be sealed must be clean and dry.
• Use a RTV sealant bead size as specified in
the service procedure.
• Apply the RTV sealant bead to the inside of any
bolt holes areas.
Important: Do not wait for the RTV sealant to
skin over.
• Assemble the components while the RTV sealant
is still wet to the touch, within 3 minutes.
Important: Do not overtighten the fasteners.
• Tighten the fasteners in sequence, if specified,
and to the proper torque specifications.
Anaerobic Type Gasket Eliminator Sealant
Anaerobic type gasket eliminator sealant cures in the
absence of air. This type of sealant is used where
2 rigid parts, such as castings, are assembled
together. When 2 rigid parts are disassembled and no
sealant or gasket is readily noticeable, then the
2 parts were probably assembled using an anaerobic
type gasket eliminator sealant.
Use the following information when using gasket
eliminator sealant:
• Always follow all the safety recommendations and
directions that are on the gasket eliminator
sealant container.
• Apply a continuous bead of gasket eliminator
sealant to one flange.
The surfaces to be sealed must be clean and dry.
Important:
• Do not allow the gasket eliminator sealant to enter
any blind threaded holes, as the gasket eliminator
sealant may prevent the fasteners from clamping
properly, seating properly, or cause damage
when the fastener tightened.
• Gasket eliminator sealed joint fasteners that are
partially torqued and the gasket eliminator
sealant allowed to cure more than five minutes,
may result in incorrect shimming and sealing
of the joint.
6-144 Engine Mechanical - 5.0L and 5.7L Engine
2002 - Unit Repair (May 25, 2001)