Use of RTV and anaerobic sealants (A20NFT/LHU)
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Use of RTV and anaerobic sealants (A20NFT/LHU)
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Note
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Essentially, three types of sealant are used in the engines. These are RTV agents (room temperature vulcanisation), anaerobic gasket substitutes and pipe sealants. The correct sealant and quantity must be used in the correct location in order to prevent oil leaks. DO NOT CONFUSE the three types of sealant. Use only the special sealant or equivalent as per the recommendations in the service procedure.
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Pipe sealant is a flexible sealant which does not set completely. This type of sealant is used when two yielding components, such as the oil pan and the engine block, for example, are fitted together.
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Do not use pipe sealant in areas where extreme temperatures can be expected. Such locations are the exhaust pipe, the cylinder head gasket, or other surfaces where a gasket substitute is specified.
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Apply the pipe sealant to a clean surface. Use the bead thickness or quantity specified in the work procedure. Place the bead on the inside of any screw holes. Do not allow sealant to get into threaded holes as this can cause the screw not to be secured properly or cause component damage when the screw is tightened.
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Place an unbroken bead of sealant on one mating surface. The surfaces to be sealed must be clean and dry.
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Tighten the screws to the specified torques. Do not tighten them too hard.
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RTV agents set when they are exposed to air. This type of sealant is used when two non-yielding components, such as the lower crankcase and the engine block, are fitted together.
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Do not use RTV agents in areas where extreme temperatures can be expected. Such locations are the exhaust pipe, the cylinder head gasket, or other surfaces where a gasket substitute is specified.
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Place the RTV agent on a clean surface. Use the bead thickness specified in the work procedure. Place the bead on the inside of any screw holes. Do not allow sealant to get into threaded holes as this can cause the screw not to be secured properly or cause damage when the screw is tightened.
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Fit together the components while the RTV agent is still damp, within three minutes. Do not wait until the RTV agent has started to set.
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Tighten the screws to the specified torques. Do not tighten them too hard.
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