BMW 3 1992 - Feeler Gauges; Torque Wrench; Digital Multimeter

010-10
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FUNDAMENTALS FOR THE DO-IT YOURSELF
OWNER
TOOLS
Torque Wrench
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Fig . 12 .
Jack stand for safely supporting car to work underneath .
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Fig . 13 . Oil change equipment
includes drain plug wrench (17mm),
8 qt . drain pan, and funnel .
A
torque wrench is used to precisely tighten threaded fasten-
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Fig . 15 . Feeler gauge set .
ers to a predetermined
value . Many of the repair procedures in
this manual include
BMW-specified torque values in Newton-
meters (Nm) and the
equivalent values in foot-pounds (ft-Ib) .
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Digital Multimeter
A torque wrench with a range up
to about 150 Nm (185 ft-lb)
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-lb) .
These small values may be most easily reached
using a torque
wrench
calibrated in inch-pounds . To convert
inch-pounds to
foot-pounds, divide by 12 .
Fig . 14 . Torque wrenches . Inexpensive beam-type (top) is adequate
but must be read visually . Ratchet-type (bottom) can be pre-
set to índicate (click) when torque value has been reached .
Feeler Gauges
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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 . See Fig . 15 .
Several types of torque wrenches are available
. They al¡ do
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Many of the electrical tests in Chis manual
cal¡ for the mea-
the same
job, bu¡ óffer different convenience features at differ-
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surement
of resistance (ohms) or voltage values . For safe
and
ent prices . Two typical
torque wrenches are shown in Fig . 14 .
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accurate tests of ignition,
fuel injection, and emission control
The most convenient
ones have a built-in ratchet, and can be
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systems, the multi-meter, shown in
Fig . 16, should be digital,
preset to indicate when a specific torque
value has been
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with high (at least 10,000 ohms) input
impedance . Some
reached .
Follow the wrench manufacturer's directions
for use
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meters have automotive functions such
as dweil and pulse
to achieve the greatest
accuracy .
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width that
are useful fortroubleshooting ignition and
fuel injec-
tion problems .
CAUTION-
The DME system, central
body electronics, and
other electronic systems may be
damaged by the
high
current draw of a test fight with a normal in-
candescent
bulb . As a general rule, use a high ím-
pedance digital
multimeter or an LED test fight for
all electrfcal testfng .
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