Disassembly and
Reassembly
(Bev.7.
12l01)
Compressor Crankshafi
Precautions
L Alignment of the conprcssor io
the engine flywheel is
controlled by the
position
of ihe engine flywheel
housing. Two che€ls should be
made
to assure
that
alignment is corfecl. Refer to lhe approprial€ Engine
Overhaul
Manunl lo correct an alignmenr
problem.
a. Use a dirl indicator to check the radial run out,
which is the concentricily of lhe flywheel lo the
flywheel housing.
Maxinum totnl indicated rdial
run our is 0.00,1in.
(O.10
mm).
Figu.e 72:
Checking
Arial Run Out
CAUTION:
Misalisnnent of the
J\twhecl
housins
to the enginc N)ill cause cmnkshaf,
frocture
as indi
Fisure 7l: Checkinq Radial Run Out
The ltywheel housing should fit tighdy against the
enginc
block. Nicks. buns rnd debris between the
block and flywhe€l housing can cause misalisn-
ment md result in a loosely mounted flywh€el
housing. Usc
r dirl indicaror to check the
axial
run
out,
which
is measured fron thc
flywheel
to end
surface of the
flywheel housing. Ma\imum rotal
indicared a),nl run our i\ 0 010 in
(0.15
mmr. See
''Figure
72: Checking Axial Run Out on
page
36.
1. Misaliqnment
Fractures
Occur
Here
2. Couplinq Poblem
Fractures
Occur
Here
Figurc 73: Cnnkhaft Fmctures
2. Fitting thc drive
coupling to the crankshaft of the con'
pressor
is a critical op€ntion
wh€n installing r com-
prcssor.
When the coupling is removed.
inspect the
€rankshafi taper and the coupliog
for
rusr and
piuing.
A
crrnlshdi
or coupling that has significant
pitting
on the
taper
should be rcpl,rced. Crankshaft failures in the
taper area
generally
are
the resulr of improper fil
belween the coupling and the crankshaft.
Refer to
"Drive
Coupting"
on
page
7 for the
proper
removal and
installation
procedures.
ii,;
36
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