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Caterpillar · Engine
1422329
In stock · ships from Knoxville
The 1422329 is an OEM oil drainback seal (also called an oil return seal) used on Caterpillar 3406, 3406E, C15, C16, C18, 3126, and 3306 series diesel engines.
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Caterpillar
Caterpillar
This seal is used in the cylinder head/block oil drain passage. Always verify compatibility with your specific engine serial number. Most commonly replaced as part of a cylinder head gasket kit.
Part data verified against 4 catalog sources
Numbers this part supersedes or interchanges with. Showing 3 of 3.
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It fits between the cylinder head and the engine block to seal the oil drain passage, preventing oil leaks and keeping the return path to the oil pan intact. Replace this seal anytime the cylinder head is removed—such as during a head gasket job or overhaul—because the rubber can harden, crack, or take a permanent set, leading to external oil leaks or cross-contamination.
Part Number: 1422329
DRAINBACK SEAL
Dealer: Post Onsite
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