GENE
RAL
INFORMATION
IS
Compression
Gauge
An engine with low compression cannot be properly
tuned and
will not develop full power. A compression
gauge (Figure 37) and adapter specifically designed for
diesel applications is required to measure the high cylin-
der compression pressure (390-470psi [2700-3300kPa]).
lf these specialized tools are not available, refer compres-
sion testing to a qualified technician. Sec Chapter Three.
Multimeter
or YOM
This instrument (Figure 38) is required for electrical
system troub leshooting.
H
attery
Hydromet
er
A hydrometer (Figure 39) is the used to check a bat-
tery's state of charge. A hydrometer measures the weight
or density
ofthe
sulfuric acid in the battery's electrolyte in
specific gravity.
Screw Pitch
Gauge
A screw pitch gauge (Fig
ure
40) determines the thread
pitch of bolts, screws, studs, etc. The gauge is made up
of
a number
of
thin plates. Each plate has a thread shape cut
on one edge to match one thread pitch. When using a
screw pitch gauge to determine a thread pitch size, fit dif-
ferent blade sizes onto the bolt thread
until both threads
match.
I
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