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Dial indicators are available in various ranges
and graduations and with three basic types of
mounting bases: magnetic (B. Figure 31). Clamp, or
screw-in stud. When purchasing a dial indicator,
select on with a continuous dial (A, Figure 31).
Cylinder Bore Gauge
A cylinder bore gauge is similar to a dial indicator.
The gauge set shown in Figure 32 consists of a dial
indicator, handle, and different length adapters
(anvils) to fit the gauge to various bore sizes. The
bore gauge is used to measure bore size, taper and
out-of-round. When using a bore gauge, follow the
manufacturer's instructions.
Compression Gauge
A compression gauge (Figure 33) measures
combustion chamber (cylinder) pressure, usually in
2
PSI or kg/ cm
. The gauge adapter is either inserted
or screwed into the spark plug hole to obtain the
reading. Disable the engine so it does not start and hold the throttle in the wide-open position when
performing a compression test An engine that does not have adequate compression cannot be
properly tuned. Refer to Chapter Three.
Multimeter
A multimeter (Figure 34) is an essential tool
for electrical system diagnosis. The voltage function
indicates the voltage applied or available to various
electrical components. The ohmmeter function tests
circuits for continuity, or lack of continuity, and
measures the resistance of a circuit.
Some manufacturer's specifications for electrical components are based on results using a specific
test meter. Results may vary if using a meter not recommended by the manufacturer. Such
requirements are noted when applicable.
Ohmmeter (analog) calibration
Each time an analog ohmmeter is used or if the
scale is changed, the ohmmeter must be calibrated.
Digital ohmmeters do not require calibration.
1. Make sure the meter battery is in good
condition.
2. Make sure the meter probes are in good
condition.
3. Touch the two probes together and observe the
GENERAL INFORMATION
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Troubleshooting
