BMW 1989-1995 525i Service Manual page 185

7. Remove the fuel rail mounting bolts (4). See Fig. 23.
-
\
,
,
001 1528
FUEL INJECTION-DME
130-17
Fig . 23. Fuel rail mounting bolts (arrow s) on M60 engine.
8. Pull up on the fuel rail and remove the rail with injec-
tors. Remove the injector retaining clips and then pull
the injectors from the fuel rail.
WARNING-
Fuel will be discharged. Do not disconnect any
wires that could cause electrical sparks. Do not
smoke or work near heaters or other fire hazards.
Keep an approved fire extinguisher handy.
Installation is the reverse of removal. Fit new a -rings when
installing the injectors. For ease of instaliation, lightly lubricate
the a -rings with SAE90 gear lube. Check that the injector
electrical connect ions are correctly fitted and that the injectors
are fully seated prior to installing the fuel rail mounting bolts.
Replace wire ties.
Tighteni ng Torque
• Fuel rail to cylinder head 10 Nm (89 in-Ib)
Fuel pressure regulator, replacing
NOTE-
Be sure the code number on otd pressure regulator
matches that of the new regulator.
On M20 and M30 engines, the fuel pressure regulator at-
taches to the fuel rail with two bolts. Disconnect the vacuum
hose and fuel return hose as shown in Fig. 24 . Remove the
bolts and then wrap a shop rag around the regulator. Pull the
regulator from the fuel rail. Installation is the reverse of remov -
al. Always replace a -rings .
6103
Fig . 24. Fuel pressure regulator (arrow ) on M20 engine. M30 engine
similar.
WARNING-
Fuel will be discharged. Do not disconnect any
wires that could cause electrical sparks. Do not
smoke or work near heaters or other fire hazards.
Keep an approved fire extinguisher handy.
On M50 and M60 engines, it will be necessary to remove
the top engine coverts} to access the fuel pressure regulator .
The fuel pressure regulator is held to the fuel rail by either a
ring clamp (199 1-1993 models) or a locking ring (1994-1995
models). To remove the regulator, remove the clamp or the
locking ring. See Fig. 25. Wrap a shop rag around the regula -
tor and pull the regulator from the fuel rail. On M50 engines,
discon nect the vacuum hose. Installation is the reverse of re-
moval. Always replace a -rings.
<:>
<(
»
OO ll S?')
Fig. 25. Fuel pressure regulator ring clamp on 1991 · 1993 M50 en-
gine. Later M50 and M60 engines use locking ring to retain
fuel pressure regulator.
COMPONENT REPLACEM ENT