Thermo King X430 - Removaland Installing Crankshaft Counterweights

Disassembly
and Reassembly
(Rev.7,
12l01)
Removal
and Installing
Crankshaft
Counterweights
Long
slroke cornprcssors
hrve lwo add-on counrerueighls
ri,reled to the inregral
counterwcight ponion
of the casl
crankshnft. Whcn regrinding
crankpin
joumals.
il is neces-
sary to rcmove
the add-on counterueighls which
rnust be
plninly
narked
so lhey may be replaced
exactly rs rhey
Thcre have
been some cltses where
a crankshrft from
a
long
slroke
compres$r was
reground and thcn insralled
wirhout
the xdd{)n
counterweights bcing reinstnlled.
The resull
can
be crncked reftgennt
lines. crncked
fram€s rnd loose
scrcws due to
an unbalanccd condition.
To
properly
rcgrind
a long srrokc
cranlshafi, rhe following
proccdur.
Drusl
be adhered Io:
l. M rk rhe
rdd on counlerwcighls.
so rhey will bc rein-
stallcd on
the samc integral
counrerw€ighr.
2. Drilloffrivct
head rnd dnve oul
rivcl wirh a
punch.
3. Regnnd thc
crankshali shafi
ro rhe new undersizcd
dirmerer Bcaring
sers lre !!.dlable
in 0.005 in.
(0.t27
'nm).0.010
in.
(0.25,1mnr).0.020
in.
(0.508
mm) and
0.0:10
in.
(0.762
mnr) undersizc.
The srnndard
diameter
ol
connecting rud
joumal
is 1.3'112
to 1.3'74'7 in.
(3i1.9O:17
ro
34.9t7,1 mm). Thc
clearanc€ lor mc
con-
necting rod
bearing ro thc crankshafi
rod
joumal
is
0.0008
ro00011 in.
(0.010.1ro
0.0610 mm/.
off lhe excess
screw length ifrequired. Stakc the
screws
wiih a
centerpunch to
prevenl
scrc{ from
backing our.
Thoroughly
ciean the crankshnft to remove
all metrl
chips
and €oat
wilh
compressoroil.
5.
6.
Trp holes
in the integrnl
counterweight with
a 5/t6- t8
UNC rap.
Countersink the holes in
the add-on counreNeight
wilh
,n
82
degree tool to accept
5/16 flat head screws.
This
must b€ done because
the original
countersink is 90
Reinst: l the
add,on counrerweights with
5/16-18 UNC
nJ| herd
'cF$s.
8e
\ure
ro in\lall
lhem on 'imi int(.
Exal
counterweight fron which
they were removed.
Cur
Remove Rivets
2. lntegral
Counterw6rght
3. Mark Count6rweiOhts
4. Add-On
Counlelweiqht
5. Counter Sink 82'
6. Tap wilh 5/16-18
UNC Threads
Figure 71: Insta
inq Countemeights