Genuine Mazda CX-9 Rear Crankshaft Oil Seal 2011-2017 ZZJ111399A

Genuine Mazda CX-9 2011-2017 Rear Crankshaft Oil Seal, ZZJ111399A is an engine system component designed to seal the crankshaft rear seal area, preventing engine oil from leaking out during operation.

On the Mazda CX-9, the rear crankshaft oil seal plays an important role in maintaining oil pressure and ensuring stable lubrication performance, helping protect the crankshaft and internal engine parts from friction and wear.

Over time, the seal may harden, crack, or wear due to high temperatures and constant friction, leading to oil leaks at the rear of the engine, oil consumption, an oily undercarriage, and reduced lubrication efficiency.

Genuine Mazda part ZZJ111399A is manufactured to factory technical standards, ensuring high sealing performance, excellent heat resistance, and full compatibility with Mazda CX-9 engines from 2011-2017.

In addition to sealing oil, the rear crankshaft seal also helps maintain stable internal engine pressure, contributing to longer service life for rotating parts and reducing the risk of serious engine damage.

Using genuine parts helps ensure durability, performance, and safety for the entire engine system during long-term use.

Product information
• Product name: Rear Crankshaft Oil Seal / Rear Crankshaft Oil Seal
• Part number: ZZJ111399A
• Brand: Mazda Genuine Parts
• Applicable vehicle: Mazda CX-9
• Model years: 2011-2017
• System: Engine
• Installation position: Crankshaft rear
• Condition: New

Function and role
• Seals oil at the crankshaft rear
• Prevents engine oil leaks
• Maintains stable lubrication pressure
• Protects the crankshaft and related parts
• Reduces friction and engine wear

Key advantages
• Genuine Mazda part
• High sealing performance, effectively resists leaks
• Good heat and pressure resistance
• Durable material, long service life
• Standard OEM fit, precise installation

Signs it needs replacement
• Oil leaks at the rear of the engine
• Oily undercarriage
• Unusual oil consumption
• Burnt smell from leaking oil
• Seal hardened or cracked

👉 The rear crankshaft oil seal is an important component that directly affects engine sealing and durability, and should be replaced promptly when oil leakage appears.

Replacement recommendations
• Inspect the front seal and related gaskets at the same time
• Replace with the correct ZZJ111399A part number to ensure compatibility
• Check the condition of the crankshaft before installation
• Clean the installation area thoroughly
• Use genuine parts to ensure durability and engine safety