Sealant Types
Important: The correct sealant and amount of sealant
must be used in the correct 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: |
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 cylinder 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: |
| - | 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: 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 correct 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. |
Notice: Refer to General Repair Instructions in the Preface section.
Important:
| • | Gasket eliminator sealed joint fasteners that are partially torqued and
the gasket eliminator sealant allowed to cure more than 5 minutes, may result
in incorrect shimming and sealing of the joint. |
| • | DO NOT overtighten the fasteners. |
| - | Apply the gasket eliminator sealant evenly to get a uniform thickness
of the gasket eliminator sealant on the sealing surface. |
| - | Tighten the fasteners in sequence, if specified, and to the correct torque
specifications. |
| - | After correctly tightening the fasteners, remove the excess gasket eliminator
sealant from the outside of the joint. |
Anaerobic Type Threadlock Sealant
Anaerobic type threadlock sealant cures in the absence of air. This type of
sealant is used for threadlocking and sealing of bolts, fittings, nuts, and studs.
This type of sealant cures only when confined between 2 close fitting metal
surfaces.
Use the following information when using threadlock sealant:
| • | Always follow all safety recommendations and directions that are on the
threadlock sealant container. |
| • | The threaded surfaces to be sealed must be clean and dry. |
| • | Apply the threadlock sealant as specified on the threadlock sealant container. |
| | Important:
| • | Fasteners that are partially torqued and then the threadlock sealant allowed
to cure more than 5 minutes, may result in incorrect clamp load of assembled
components. |
| • | DO NOT overtighten the fasteners. |
|
| • | Tighten the fasteners in sequence, if specified, and to the correct torque specifications. |
Anaerobic Type Pipe Sealant
Anaerobic type pipe sealant cures in the absence of air and remains pliable
when cured. This type of sealant is used where 2 parts are assembled together
and require a leak proof joint.
Use the following information when using pipe sealant:
| • | DO NOT use pipe sealant in areas where extreme temperatures are expected.
These areas include: |
| - | Surfaces where a different sealant is specified |
| • | Always follow all the safety recommendations and the directions that are
on the pipe sealant container. |
| • | The surfaces to be sealed must be clean and dry. |
| • | Use a pipe sealant bead of the size or quantity as specified in the service
procedure. |
Notice: Refer to General Repair Instructions in the Preface section.
| • | Apply the pipe sealant bead to the inside of any bolt hole areas. |
| • | Apply a continuous bead of pipe sealant to one sealing surface. |
| | Important: DO NOT overtighten the fasteners.
|
| • | Tighten the fasteners in sequence, if specified, and to the correct torque specifications. |
