Oil Check Valve and Spray Nozzle Valve, Removing and Installing

WARNING: This page is about a different car, the 2009 Audi S8, 2008 Audi S8, and 2007 Audi S8. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

If irregular valve noise occurs repeatedly during short journeys and disappears after extended driving, the oil check valve must be replaced.

Removing

Remove intake manifold → 24 - MULTIPORT FUEL INJECTION (MFI) .

Fig 1: Removing Bolts, High Pressure Line, Connections & Fuel Rail

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remove bolts - 2 - and - 3 -.
Remove high pressure line - 1 - from fuel rail.
Remove high pressure line from connections - 4 - and - 5 - on fuel rail. To do this, counterhold at hex head with and open-end wrench and loosen union nut.
Remove high pressure lines.

Fig 2: Identifying Bolts & Cover With Crankcase Ventilation Hose

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remove bolts - arrows -.
Remove cover - 2 - with crankcase ventilation hose - 1 -.

Fig 3: Identifying Oil Check Valve And Spray Nozzle Valve

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remove oil check valve - 1 - and spray nozzle valve - 2 -.

Installing

Installation is in reverse order of removal, note the following:

NOTE:

Replace gaskets and O-rings.

Install high pressure lines → 24 - MULTIPORT FUEL INJECTION (MFI) as described under "Fuel injectors, removing and installing".
Install intake manifold → 24 - MULTIPORT FUEL INJECTION (MFI) .

Tightening specifications

Component	Nm
Cover to cylinder block	9