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1D-4 Engine Mechanical:
Replacing Engine Gaskets
Gasket Reuse and Applying Sealant
• Do not reuse any gasket unless specified.
• Gaskets that can be reused will be identified in the
service procedure.
• Do not apply sealant to any gasket or sealing surface
unless specified in the service procedure.
Separating Components
• Use a rubber mallet in order to separate the
components.
• Bump the part sideways in order to loosen the
components.
• Bumping of the component should be done at bends
or reinforced areas of the component to prevent
distortion of the components.
Cleaning Gasket Surfaces
• Use care to avoid gouging or scraping the sealing
surfaces.
• Use a plastic or wood scraper in order to remove all
the sealant from the components.
Do not use any other method or technique to remove
the sealant or the gasket material from a part.
• Do not use abrasive pads, sand paper, or power tools
to clean the gasket surfaces.
– These methods of cleaning can cause damage to
the component sealing surfaces.
– 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.
NOTE
Do not overtighten the fasteners.
• Tighten the fasteners to the proper specifications.
Use of Room Temperature Vulcanizing
(RTV) and Anaerobic Sealer
Sealant Types
NOTE
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:
• Anaerobic sealant room temperature vulcanizing
(RTV)
• Anaerobic sealant, which include the following:
– Gasket eliminator
– Pipe
– Threadlock
Anaerobic Type Room Temperature Vulcanizing
(RTV) Sealant
Anaerobic type room temperature vulcanizing (RTV)
sealant cures in the absence of 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.
CAUTION
!
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.
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Troubleshooting
