Distributor Cap/Rotor/Spark Plug; Wires, Replacing; Fuel Filter, Replacing - BMW 1989-1995 525i Service Manual

MAINTENANCE PROGRAM
020-11
Table
f.
Spark Plug Applications
Modell Spark plug
I
Electrode gap
Eng ine
Bosch
I
525ifM20 W8 LCRiW8 LPR"
0.7-0.8 mm
(.028-.032 in.)
525i/M50 F7 L DCR Non-adjustable
-
-
535i/M30 W8 LCRiW8 LPR ' 0.7-0.8 mm
(.028-.032 in.)
-
- -
.
530ifM60
F7 L DCR Non-adjustable
.
540i/M60
I
F7 L DCR Non-adjustable
Lightly lubricate the new spark plug threads with a little oil.
Thread the plugs into the cylinder head by hand to prevent
cross-threading. Torque the spark plugs.
Tightening Torque
• Spark plug to cylinder head 30 Nm
(22
ft-Ib)
NOTE -
Abnormal spark plug condition couki also result from
spark plugs of the wrong specification. Check replace-
ment plugs carefully and follow the spa rk plug manu-
facturer 's recommendations.
Distributor cap/rotor/spark plug wires, replacing
The distributor cap . rotor. and spark plug wires deliver high-
voltage spark to the spark plugs. They are subject to insula-
tion brea kdown. corrosion fouling. and electrode wear and
damage. The componen ts should be inspected and replaced
as necessary at the intervals listed under Maintenance Ta-
bles to ensure maximum engine efficiency . Guidelines for vi-
sual inspection and testing. and instructions for replacement
are found in 120 Ig ni tion System-DME.
Fuel filter, replacing
The filter should be replaced at the spec ified interval. The
fuel filter is located beneath the right rear of the car. just in
front of the gas tank. See Fig. 7.
NOTE -
Some eighf cylinder models (cars built Irom March
1993) are equipped
witt:
two fuet filters.
When replacing the fuel lilter. disconnect the battery nega -
tive (-) cable and clamp the filter inlet and outlet hoses to less-
en fuel spillage. Loosen the clamping bracket and the two
hose clamps on either end of the filter. Note the arrow or mark-
ings indicating direction of flow on the new filter. Install the fil-
ter and use new hose clamps .
00"9' 5
Fig. 7. Fuel tilter beneath
car
near nght rear wtleel. Drection of flow
is indicated on filter housing. Loosen clamping bracket at filler
center (A) and hose clamps (arrows). Replace hose clamps.
WARNING-
Fuel wilt be spitled when the filler is remove d. Do
not smoke or work near heaters or Ofher fire haz-
ards. Keep
a
fire extinguisher handy.
GAUT/ON -
Glean thoroughly around the fitter connections be-
fore removing. Make sure no dirt gets into the fuet
lines.
Valve clearance, adjusting (M20/M30 eng ines)
1989-1990 525i mode ls and all 535i models require period -
ic valve clearance checking and adjusting. The complete
valve adjustment procedu re is covered in 116 Cylinder Head
and Valvetrain.
Camshaft drive belt, replacing (M20 engine)
1989 and 1990 525i models use an overhead cams haft that
is actuated by a toothed rubber drive belt. See Fig. 8. Due to
belt composition and high under-hood temperatures . the belt
is subject to wear. BMW recommends that the belt be re-
placed at least every 50,000 miles . every four years, or any-
time belt tension is relieved. See 118 Camshaft Timing Belt
for belt replacement procedures.
GAUTlON-
II the camshaft drive belt fails with the engine run-
ning. the pistons will con lact and bend lhe valves.
ENGINE COMPARTMENT MAINTENANCE