TOYOTA 17173-17020 Exhaust Manifold Gasket

The genuine TOYOTA exhaust gasket (exhaust manifold gasket) with part number 17173-17020 is a precision component providing a gas-tight seal between the cylinder head and the exhaust manifold. Its primary task is the leak-free routing of hot, high-pressure combustion gases into the exhaust manifold and the turbocharger, thereby ensuring optimal boost pressure, engine performance, and compliance with emission standards.

Technical Specifications and Operation

The exhaust manifold gasket is subjected to extreme mechanical and thermal stresses. The differing thermal expansion rates of the cylinder head and the exhaust manifold generate continuous stress, which is compensated for by the specially layered, heat-resistant metal construction.

• Component type: Exhaust manifold gasket (to cylinder head)
• Manufacturer: TOYOTA OEM
• Fitting position: Between cylinder head and exhaust manifold
• Material properties: Heat- and pressure-resistant multi-layer metal alloy

Symptoms of Wear and Failure

A blown or deformed exhaust gasket directly impacts engine operation. Typical symptoms of failure include:

• Distinct whistling, hissing, or ticking exhaust leak noises during cold starts and under load
• Visible soot deposits around the mating surfaces of the cylinder head and exhaust manifold
• Noticeable exhaust gas odor in the engine bay or via the cabin ventilation system
• Loss of boost pressure and reduced engine power due to escaping exhaust gas energy

Vehicle Compatibility

• Toyota Coaster (B40/B50) 4.2 TD [1995 - 2004] (GASKET, EXHAUST MANIFOLD TO HEAD (1HDFT))
• Toyota Land Cruiser 100 (J100) 4.2 TD [1998 - ...] (GASKET, EXHAUST MANIFOLD TO HEAD (HDJ100, 1HDFTE))
• Toyota Land Cruiser 70 (J70) 4.2 TD [2001 - 2007] (GASKET, EXHAUST MANIFOLD TO HEAD (HDJ70, 1HDFTE))
• Toyota Land Cruiser 80 (J80) 4.2 TD [1995 - 1998] (GASKET, EXHAUST MANIFOLD TO HEAD (HDJ80, 1HDFT))