DeWalt DW168F - Inspection

50

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.
modeL
Standard
(mm)
Service
Limit
(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.
modeL
Standard
(mm)
Service
Limit
(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
modeL
Standard
(mm)
Service
Limit
(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
modeL
Standard
(mm)
Service
Limit
(mm)
dW168
1.450 1.200
dW177
2.000 1.750
dW188
2.000 1.250
PISTON RING SIDE CLEARANCE
RING, TOP
MODEL
STANDARD
(MM)
SERVICE
LIMIT
(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
MODEL
STANDARD
(MM)
SERVICE
LIMIT
(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.
MODEL
STANDARD
(MM)
SERVICE
LIMIT
(MM)
dW168
18.002~18.008 18.042
dW177
18.002~18.008 18.042
dW188
20.002~20.008 20.042
MICROMETER
FEELER
GUAGE
FEELER
GUAGE
MICROMETER
MICROMETER
DIAL INDICATOR
BORE GAUGE
DIAL INDICATOR
BORE GAUGE