Service Hints - Yanmar 1GM User Manual

GENE RAL I:' o l FORM ATION
in excess ofthosc for whic h they were desi gned . The bear-
ing or rotating part
can disint egrate and cause serious in-
jury and dam age. Hold the inner bearing race by hand to
prevent bearin g dama ge when us ing compressed air.
SE RVICE HI NTS
Mos t of the service procedures covered are straightfor-
ward and ca n
be
pcrfonned
by
anyone reasonably handy
with loo ls. It is sugges ted. however, that you cons ider
your capabilities ca refully befo re attempti ng any opera-
tion involving major disassemb ly.
I. When disassembling engine or drive components,
mark the parts for loca tion and mark all pans that male to-
gether. Small parts. such as bolls, can be identified by
placing them in plastic sandwich bags ( Figu re 3). Sea l the
bags and label them . Ifreassemb ly
will
tak e p lace imm e-
diately, an accepted practice is to place nuts and bolt s in a
cupcake tin or egg carton in the orde r of disassembly. Be-
cause man y ty pes or ink fade if appli ed to tape , use a per-
manent ink pen.
2. Protec t fini shed surfaces from physical damage or co r-
rosion. Keep gasoline off pa inted surfaces.
3. Use penetrating oil on frozen or tight bo lts, then strike
the
bolt
head a few times with a hammer and punch (usc a
screwdriver on screws). Avoid the usc of heat where po s-
sible. as it can wa rp. me lt or affect the temper of pans.
Heat also dam ages finishe s, es pecia lly paint and plastics.
4. No parts removed or installed (other than bushings and
bearings) in the pro cedures desc ribed in this manual
should require unu sual force during disassembly or as-
sembly. If a part is difficult to remove or inst all, find out
why before proceed ing.
5. Cover all ope nings after remo ving parts or compo-
nent s to pre vent contaminants and sma ll tool s from falling
m.
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6. Read eac h procedure completely while looki ng at the
actual parts befo re starting a job. Make sure you
thor-
oughly
understand wha
t is to be done
and then carefully
follow the procedu re, step by step.
NOTE
Some ofthe procedures or service specifica-
tions in this manual may not be accurate
if
the engine has been modified or
if
it has
been equipped with after-market equipment.
Ifinstalling after-market equipment or
if
the
engine has been modified.file all printed in-
structions or technical information regard-
ing the new equipment in a folder or
notebook for fu ture reference.
If
the engine
was purchased used. the previous Olmer
may have modified it or installed non-stock
parts. Ifnecessary: consult with a dealer or
the accessory manufacturer on ser-
vice-related changes.
7.
Reco mmendat ions are occasionally made to refer ser-
vice or ma intenance to a ma rine dea lership or a specialist
in a particular field. In these cases, the work will be done
more quickly and economically than performing the work
at home .
8. In procedural steps. the term
replace
means to discard
a defective part and replace it wi th a new or exchange unit.
Overhaul
mean s to remove, disassembl e, inspec t, mea-
sure. repair or replace de fect ive parts , reassemble and in-
stall major sys tems or pans.
9. Some operation s requ ire the use of a hydraulic press. It
would be wiser to have these operations performed by a
shop equ ipped for such work , rather than to try to do the
j ob yourself with ma keshi ft equi pment that may damage
the ma chi ne.
10. Repairs go much faster and easier if the machine is
clean befo re begi nning work. There are man y special
cleaners on the ma rket for wa shing the engine and related
parts. Follow the manufacturer 's direc tions on the con-
tainer for the best result s. Clean all oily or greasy parts
with cleaning solvent as they are removed.
WAR. N IN G
Never use gasoline as a cleaning agent. Be
sure to work in a well-ventilated area when
using cleaning solvent. Keep a fi re extin-
guisher. rated fo r gasoline fi res, on hand.
11. Mu ch ofthe labor charges for repairs made by dealers
are for the time involved in the removal, disassemb ly, as-
sembly and reinstallat ion of other parts in order to reach
the defective part. It is often po ssib le
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perform the pre -
limi nary operations and then take the de fective unit to the
dealer for repair at considerable sav ings.
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