GENERAL
INFORMATION
13
Ha mmers
The correct hammer (F
igure
29) is necessary for many
types
of
repairs.
Usc
only a
hamme
r
with
a face
(or
head)
made
of
rubber
or plastic or the soft-faced type filled with
leadshot. Never usc a metal-faced hammer on engine or
jet
pum
p parts, as severe
damage
will result. Ba ll-peen or
machinist's ha
mm
ers are required
if
striking ano ther too l,
such as a
punch
or
impact
driver.
When
striking a
hammer
against a punch, cold chisel or
similar
tool, the face
of
the
hammer should be at least 1/2 in. larger than the head of
the tool. I
fi
t is necessary to strike hard against a steel part
without damaging it, use a brass
hammer
. A brass
hammer
can be used because brass will give when striking a harde r
object.
_When_using hammers, note the following:
l.
Always
wear safety glasses.
2. Inspect hammers for damaged or broken parts. Repair
or replace the hammer as required. Do not use a hammer
with a taped handle.
3. Always wipe oil or grease
off
the hammer before using
it.
4. The head
of
the hammer should always strike the ob-
ject squarely. Do not use the side
of
the hammer or the
handle to strike an object.
5. Always use the correct hammer for the job.
P
RECIS
ION
MEASURING
TOOL S
Measurement is an important part of service. When per-
forming many
of
the service procedures in this manual, a
number
of
measurements will be required. These include
basic checks, such as engine compression and spark plug
gap. Measurements will be required to determine the con-
dition
of
the piston and cylinder bore, crankshaft runout
and so on. When making these measurements, the degree
of
accuracy will dictate which tool is required. Precision
measuring tools arc expensive. If these tools are not avail-
able, it may be more worthwhile to have the checks made
at a dealer.The following is a description
of
the measuring
tools required during engine and transmission overhaul.
Feeler Ga uge
A feeler gauge
(Figure
30) is made
ofa
piece
of
a flat or
round hardened steel
of
a specified thickness. Wire
gauges are used to measure spark plug gap. Flat gauges
arc used for all other measurements.
I
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