Repair notes for cylinder head or engine replacement

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2023 BMW M5, 2022 BMW M5, 2021 BMW M5, 2020 BMW M5, and 2019 BMW M5. However, it is still accessible from the selected car via links, so may be relevant.

Problem

After replacing the cylinder head, a loud rattling noise occurs in the area of the cylinder head or cylinder head cover after starting the engine. One or more roller cam followers can pop out.

Cause

The new part cylinder head does not contain any engine oil. The oil supply to the valve clearance compensating elements on the exhaust side and in the area of the exhaust valve stems is not optimal at the first engine start.

Measures

Observe the sign in the engine compartment! Only pour in with the correct SAE viscosity classification.

Before installing the cylinder head cover, the valve stems of all exhaust valves must be moistened with engine oil. See the "Fluid Capacities" tab for the selected vehicle.

Before the first engine start, the engine only needs to be turned with the starter (without combustion) for a few seconds. The maximum permissible uninterrupted operating period must not be exceeded.

Maximum permissible uninterrupted starter operating period: 15 seconds

To guarantee this, the electrical connections of all injectors must be disconnected. Alternatively, the wiring harness for injection and ignition must be unplugged from the Digital Motor Electronics (DME). For additional information, see: , but without removing ignition coils and spark plugs.

Turning the engine with the starter (without combustion) ensures that the valve train has a sufficient oil supply to start the engine regularly afterwards.

Then reconnect the injectors or the wiring harness for injection and ignition to the Digital Motor Electronics (DME).

Delete the fault memory.

Start engine.