Inspection - DeWalt DW168F Manual

InspeCtIon

CylInDER I.D.
measure and record the cylinder I. D. at three
levels in both the "X" axis (perpendicular to
the crankshaft) and the "Y" axis (parallel to
crankshaft).
Take the maximum reading to determine
cylinder wear and taper.
Service
Standard
modeL Limit
(mm)
(mm)
dW168
68.015~68.025 68.156
dW177
77.02~77.03 77.179
dW188
88.015~88.025 88.195
pIsTon skIRT o.D.
measure and record the piston O. D. at a point
of 10 mm (0.4") from the bottom of the skirt
and 90° to the piston pin bore.
Service
Standard
modeL Limit
(mm)
(mm)
dW168
67.975~67.985 67.850
dW177
76.970~76.980 76.850
dW188
87.970~87.980 87.850
pIsTon To CylInDER ClEaRanCE
Service
Standard
modeL Limit
(mm)
(mm)
dW168
0.030~0.050 0.120
dW177
0.040~0.060 0.100
dW188
0.045~0.065 0.100
pIsTon RInG WIDTh
Service
Standard
modeL Limit
(mm)
(mm)
dW168
1.450 1.200
dW177
2.000 1.750
dW188
2.000 1.250
DIAL INDICATOR
bORE GAUGE
mICROmETER
mICROmETER
pIsTon RInG sIDE ClEaRanCE
RInG, Top
sERVICE
sTanDaRD
MoDEl lIMIT
(MM)
(MM)
dW168
0.08~0.12 0.10
dW177
0.02~0.06 0.15
dW188
0.02~0.06 0.15
pIsTon RInG EnD Gap
sERVICE
sTanDaRD
MoDEl lIMIT
(MM)
(MM)
dW168
0.15~0.35 1.00
dW177
0.20~0.35 1.00
dW188
0.20~0.40 1.00
noTE: Use the top of the piston to position the
ring horizontally in the cylinder.
pIsTon pIn o. D.
sTanDaRD (MM) sERVICE lIMIT (MM)
17.992~17.998 17.940
pIsTon pIn BoRE I. D.
sERVICE
sTanDaRD
MoDEl lIMIT
(MM)
(MM)
dW168
18.002~18.008 18.042
dW177
18.002~18.008 18.042
dW188
20.002~20.008 20.042
50
fEELER
GUAGE
fEELER
GUAGE
mICROmETER
DIAL INDICATOR
bORE GAUGE