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ENGINE MECHANCAL
'0-25 Piuto,u Mensure
mmli
There
are two
m,ethad,s or Imueasurir.g piston
clearance; with a micrometer or wfth ribbon feeler
gatmges. Both op these rwo '-nc'tiu;uds are ewlained
i:i detail, as follows:
0.
Micrometer Meo.urements
'flee
equipment required consists of a 3'' tn 4''
outside mb' rune tsr and an Irs do uii icrolmucue r of
the same size. The outside micrometer mual be
adluated to turn ftcely, so that:'u calm be;udjusted
up no the pisunn with a very light tu r'iing ef[orl
on the screw, if it is adii:a-med Rn get
frictional
feei over the piston, it will show several monuhe
of
a
thousandth
smaller
thao it.5 actual
sIze.
With
practIce,
fractional
:h,,uea u'.d tha can be
checked
The inside nUctometet rot Ineastlring the cr-I-
il;dcrs must be provided with
3",
t'ztc!,;sio-l imodie
and alias ted
a
time Sc
tCW
n:: roe sufficiently ti glut
to
retain
Its
setting while checking the cyi inder
at the dietent pohurs to he measured.
romerer should
:1;"
he:akc:,' a,i tIle c,lil:der sizes.
After ;uh: aining a light fee I:;,-, flue ir.a:de :.:ic ro
meter
11'b4
a one ci
of tIe bar sn ta -,;:e the exact
center of the cyliuidet as
,:
ia'a
Ins
-cac; ha led
t'ermic& plane,
reninve- t::t!
Infcrur;clCr :l:ld
lllc'as'ore its length witf. the oultstde ,,iicrolluc!ter
-
ft,is sho,i:d be done. ho.
,,
,i
e,,e
eli'_l a,ru
al:vil of
Ole ,lu:ei 'at
emete,r n:ud :urt,.:alit.p the
s,stcw,
the same feel ha obna.-,cd a's 'eu, felt
hi
m;,c',l oar_mug
the piston.
Ry nih S ,::dl':c,rl, if :he tai'n 'iii::
u',, unc'ucrs
do uol
d're,i
ii, rt.adings.
m: errnr oh'! rc:.s'::ln in
arrle-
i:ug
am
ulle actual net
l:iearauuce
of :11,:' p:st°n
in
the cr1 :ntlcr at any point.
ii
uuu coa,1ring
the p:'s°i na, iu wh'l be noted' the
ufpt.'':
e,'d of
tile
skir t:s
always mlue s,,:ailest.
,Ahl siuni i',:,
0,
p.15 lone are
ground tapel't''r.
I>;: tile
skirt
to
imuake
the I,:'s:,in .00l2'_.L'i,!2t'
at
the open end. Tin.;,
if
tile
clearance
we to
.0,i2'
at
n:z
t,pper
en,:
eu:-,1
the ekiru :r+ete.d
nhcro
wold he no clearance
at
:he hsmt1auii,
or
if the cylinder were .;';c,I',,'' smaller at :lieh:eu
tool,
the piston
would he in
conflIct l,,u:.::;Jtl3''.
lii '22
Meousus p.'.tau
V." be' ow tuosa ulol
Measuring Piston
Diameter
ra011
Scok
Plnce ic't'lt'! ot:iue
-
ci h,1k
spot
ci
pi:uauu uuent to
T_aleu
Fitting
Pistons to
Cyrinder Bores
The direct readings shown on The inside niie
-
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