BMW 5251 Service Manual page 118

. . -
-
Cylinder Head Removal and Installation
-
Working at side of intake manifold near left strut tower, dis-
connect intake manifold resonance valve electrical harness
connector.
4
Disconnect fuel injector electrical harness connectors from
injectors.
-
Use small screwdriver to pry out wire lock clip on fuel injec-
tor 1 connector.
Repeat for remaining injectors.
Release harness conduit fasteners from injector rail.
-
Disconnect intake air temperature sensor electrical har-
ness connection (between intake runners for cylinders 3
and 4).
Lift off connector assembly and lay aside.
4
Where applicable, remove schraeder valve cap (arrow) from
fuel ra~l. Using a tire chuck, blow fuel back through feed line
using a brief burst of compressed air (maximum of 3 bar or
43.5 psi).
WARNING-
Fuel is underpressure (approx. 3
-
5 bar or 45
-
75psi) and
may be expelled. Do not smoke or work near heaters or
other fire hazards. Keep a fire extinguisher handy Before
d~sconnecting fuel hoses, wrap a cloth around fuel hoses
to absorb any leaking fuel. Catch and dfspose of escaped
fuel. Plug all open fuel lines.
Always unscrew the fuel tank cap to release pressure
I
in the tank before working on the tank or lines.
Disconnect manifold vacuum line (arrow)
Raise car and support in a safe manner,
CAUTION-
Make sure the car is stable and well supported at all times.
Use a professional automotive lift orjack stands designed for
the purpose. A floorjack is not adequate support.
Remove protective engine splash guard from below engine.