BMW 1989-1995 525i Service Manual page 18

010-10
FUNDAMENTALS FOR TH E DO-IT-YOURSELF OWNER
6C2 tFNG
B02,FNG
Fig. 12. Jack stand for safely supporting car to work underneath.
BOIBFNG
Fig. 14. Torque wrenches . Inexpensive beam- type (top) is adequate
but must be read visually. Ratchet-type (bottom) can be pre-
set to indicate when torque value has been reached.
Oil Change Equipment
Chang ing engine oil requires a 17mm socket to loosen and
tighten the drain plug, a drain pan (at least 8 qt. capacity), and
an oil filter wrench. These items are shown in Fig.
13. A
wide ,
low drain pan will fit more easily under the car. Use a funnel to
pour the new oil into the engine.
A torque wrench with a range up to about 150 Nm (185 ft-Ib)
has adequate capacity for most of the repairs covered in this
manual. For recommended torque values of 10 Nm or below ,
the English system equivalent is given in inch-pounds (in-Ib).
These small values may be most easily reached using a torque
wrench calibrated in inch-pounds. To convert inch-pounds to
foot-pound s, divide by
12.
Feeler Gauges
Feeler gauges are thin metal strips of precise thickness.
used to measure small clearances. They are normally available
as a set, covering a range of sizes.
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o
0
-~
V
0
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B022FNG
B022FNG
Fig . 13. Oil change equipment Includes drain plug wrench (17mm),
8 qt. drain pan, oil filter wrench, and funnel.
B020FNG
Torque Wrench
A torque wrench is used to precisely tighten threaded fasten-
ers to a predetermined value . Nearly all of the repair proce -
dures in this manual include BMW-specified torque values in
Newton-meters (Nm) and the equivalent values in foot-pounds
(ft-Ib).
B020FNG
Fig. 15. Feeler gauge set, used for precise measurement iobs. such
as checking valve clearances.
Several types of torque wrenches are widely available. They
all do the same job. but otter diNerent convenience features at
diNerent prices. Two typical torque wrenches are shown in Fig.
14. The most convenient ones have a built-in ratchet. and can
be preset to indicate when a specific torque value has been
reached. Follow the wrench manufacturer's directions for use
to achieve the greatest accuracy.
TOOLS