GENERAL INFORMATION
tions. The lower the number, the easier the engine will
turn over in cold climates. Higher numbers arc usually
recommended for engine running in hot weather condi-
t
ions.
Additional informat ion is provided in Chapter Four.
Gr
ease
Greases are graded by the National Lubricating Grease
Institute
(NLGT).
Greases are graded by number accord-
ing to the consistency
of
the grease; these range from No.
000
to
No.6
, with No
.6
being the most solid. A typical
multipurpose grease is
NLG
I No
.2
. For specific applica-
tions, equipment manufacturers may require grease
with
an additive such as molybdenum disulfide (MoS
2
) .
RTV G
ASKET
SEALA
NT
Room temperature vulcanizing (RTV) sealant is used
on some pre-formed gaskets and to seal some
compo-
nents. RTV is a silicone gel supplied in tubes and can be
purchased in a number
of
different colors.
Moisture in the air causes RTV to cure. Always place
the cap on the tube as soon as possible when using RTV
RTV has a shelf life
of
one year and will not cure properly
if
the
shelf
life has expired . Check the expiration date on
RTV tubes before usc, and keep partially used tubes
tightly sealed.
App
lying RTV Sealant
Clean all gasket residue and contaminants from mating
surfaces. Remove all RTV gasket material from blind at-
taching holes, as it will affect bolt torque.
Apply RTV sealant in a continuous bead 2-3 mm
(0.08-0.12 in.) thick. Circle all mounting holes unless oth-
en-vise specified. Torque mating parts within 10 minutes
after application.
9
Tl
IREAD
LOCK
Because
of
the marine engine's operating conditions, a
threadlock (Figure 16) is required to help secure many of
the fasteners. A threadlock will lock fasteners against
vi-
bration loosening and seal against leaks. Loctite 242
(blue) and
27 1 (red) are recommended for many
threadlock requirements described in this manual.
Loctite 242 (blue)
is a medium-strength threadlock, and
component disassembly can be performed with normal
hand tools. Loctite 271(red) is a high-strength threadlock,
and heat or special tools, such as a press or puller, arc
re-
quired for component disassembly.
Applying T
hr
eadlock
Surfaces should be clean. If a threadlock was previ-
ously applied to the component, this residue should also
be removed.
Shake the Loctite container thoroughly and apply to
both parts. Assemble parts and/or tighten fasteners.
BASIC
llANO
TOOL S
Many
of
the procedures in this manual can accom-
plished with simple hand tools and test equipment famil-
iar to the average home mechanic. Keep tools clean and
organized in a toolbox. After using a tool, wipe
off
dirt
and grease and return the tool to its correct place. Wiping
tools
off
is especially important if servicingthe craft inar-
eas
where they can come in contact with sand. Sand is
very abrasive and will cause premature wear to engine
parts.
High-quality tools are essential; they arc also more
eco-
nomica l in the long run. Stay away from the adve rtised
specials featured at some stores. These are usually a poor
grade tool that can be sold cheaply. They are usually made
of inferior material and arc thick, heavy and clumsy. Their
rough finish makes them difficult to clean , and they usu-
ally
don't
last very long.
Quality tools are made
of
alloy steel and arc heat treated
for greater strength. They are lighter and better balanced
than poorly made ones. Their surface is smooth, making
them a pleasure to work with and easy to clean. The initial
cost
of
quality tools may be more, but they are less expen-
sive in the long run.
The following tools are required to perform virtually
any repair job. Each tool
is described and the recom-
mended sizes given. Metric size tools arc required to ser-
vice Yanmar diesels.
1
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