Disassembly and Reassembly
(Rev.
7, 12l01)
5. Remove
the
snap nngs
from.he
piston.
AGA564
Ficure s9: Rernoval of snap Rins
lrott
Piston
piston grooves,
or if the
piston grooves
are
worn
flat
NOTE: Thc grooved piston
supe$edes the
fiet
tap
pk-
ton. The
gmoved pltbn
has sna co centric
crooves
on the top o! the
pisron
undu thc nng wlve. Thcse
grooves
redue the snctian betveen the top of thc pis-
.on and the ing valve. The
smovcd
and
fut
top
pis-
tons arc interchangeable,
but thc
piston
components
arc not Do Not Usc Flat Top Pktons-
Inspect
the
wrist pin
for
werr
or damage. Measure the
wrist pin
if n shows signs of wear.
Ifthe oulside diame
ter of rhe wrisr pin
is less than 0.6:50 in.
{15.8750
min), replrcc fie piston
assembly.
lnspccr $e wrist
pin
bushing
in
lhe
small
end of the
connecring rod
for
wear
or damage. Measure the
wrist
pin
bushing. Repla€e rhe wrisr
pin
bushing if its inside
diameler is more than 0.6258 in.
(
15.8953 mm).
lnsp€ct large end ofconnccring rod
for
wear or damage.
Remove
the
wrisl pin
from the
piston
wrisr
pin
is n floar fit so
you
should be
our by hand.
10.
9.
lt.
Piston Piston Head
2. Wrist Pin Binq Valve
3. Snao Rino
Figure
60: Piston Conponcn6
I Check
Bearinq
Fil
2.
Check Boll
for
Damaqe
Irigure 6I: Inspect Connecting Rod
,7
8
Remove the
pislon
from
the
rod.
Inspect the
piston, piston
h€ad,
and
nng valve
tor
wear
or damige. Replace
the complete
piston
assembly if rhe
nng valve is wom,
cracked. broken or missing. if
excessive
grooves
are wom into
the
ring valve
from the
NOTE: Thermo
King does not recomment rcinstall-
ing used .onnecring ftd bearings.
Use
new
b?anngs
for
inspocnnC
&e connecting rcd and &e crunkshaft
30
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