Important:
• A number of sealant types are commonly used in engines. Examples are; Room Temperature Vulcanizing (RTV) sealer, anaerobic gasket eliminator sealer, anaerobic thread sealant and pipe joint compound. • The correct sealant and amount must be used in the specified location to prevent oil and coolant leaks. • Do not interchange the different types of sealers and use only the specified sealer or equivalent as recommended in the service procedure.
Pipe Joint Compound
Pipe joint compound is a pliable sealer that does not completely harden. This type of sealer is used where two non-rigid parts (such as pressed steel and machined surfaces) are assembled together.
Do not use pipe joint compound in areas where extreme temperatures are expected. These areas include exhaust manifold to cylinder head or other surfaces where a gasket eliminator is specified.
Follow all safety precautions and directions for use that are on the container. To remove the sealant or the gasket material, refer to Replacing Engine Gaskets.
Apply pipe joint compound to a clean and dry surface. Use a bead size or quantity as specified in the procedure and run the bead to the inside of any bolt holes. Do not allow the sealer to enter any blind threaded holes as it may cause the fastener to bottom out and prevent the fastener from clamping correctly or cause component damage when the fastener is tightened. Tighten fasteners to the correct torque specification.
Examples of locations where a pipe sealant type material such as Loctite 565 or equivalent is to be used are:
| • | Cylinder block coolant and oil gallery plugs |
| • | Oil pressure sensor threads |
| • | Cylinder block oil pan surface |
RTV Sealer
Room Temperature Vulcanizing (RTV) sealant hardens when exposed to air. This type of sealer is used where two non-rigid parts such as the intake manifold and the cylinder head are assembled together.
Do not use RTV sealant in areas where extreme temperatures are experienced. These areas include exhaust manifold to cylinder head or other surfaces where a gasket eliminator is specified.
Follow all safety precautions and directions for use that are on the container.
To remove the sealant or the gasket material, refer to Replacing Engine Gaskets.
Apply RTV to a clean and dry surface and use a bead size as specified in the service procedure. Run the bead to the inside of any bolt holes. Do not allow the sealer to enter any blind threaded holes as it may prevent the fastener from clamping correctly or cause components damage when the fastener is tightened.
Assemble components and tighten fasteners to the correct torque specification while the RTV is still wet (within 3 minutes at room temperature of 20 to 25 degrees C). Do not wait for RTV to skin over.
Anaerobic Sealer
Anaerobic gasket eliminator or thread sealant hardens with the absence of air. This type of sealer is used where the two rigid parts (such as castings) are assembled together, where fasteners are subjected to vibration or where the holes are not blind. When two rigid parts are disassembled and no sealer or gasket is readily noticeable, the parts were probably assembled using a gasket eliminator.
Follow all safety precautions and directions for use that are on the container.
To remove the sealant or the gasket material, refer to Replacing Engine Gaskets.
Apply a continuous bead of gasket eliminator to one flange or on the bolt/stud thread. All surfaces must be clean and dry. Spread the sealer evenly on the sealing surface. Do not allow the sealer to enter any blind threaded holes as it may prevent the fastener from clamping correctly or cause component damage when fastener is tightened.
Tighten all fasteners to the correct torque specification. After correctly tightening the fasteners, remove any excess sealer from the outside of the joint.
Examples where thread locking sealant such as Loctite 242, Loctite 272 or equivalent are to be used are:
| • | Fuel rail attaching studs (Loctite 242) |
| • | Intake manifold attaching bolts (Loctite 242) |
| • | Cylinder head M8 bolts (Loctite 242) |
| • | Exhaust manifold attaching bolts (Loctite 272) |
