Specifications

12

MaIntenanCe stanDaRDs
PART ITEM
DW168 DW177 DW188
*STANDARD (MM)
*SERVICE LIMIT
(MM)
*STANDARD (MM)
*SERVICE LIMIT
(MM)
*STANDARD (MM)
*SERVICE
LIMIT(MM)
ENGINE Cylinder compression
50 – 90 psi - 60 – 100 psi - 60 – 100 psi -
CYLINDER Sleeve I.D.
68.015~68.025 68.156 77.02~77.03 77.179 88.015~88.025 88.195
CYLINDER HEAD Warpage
0 0.10 0 0.10 0 0.10
PISTON Skirt O.D.
67.975~67.985 67.85 76.970~76.980 76.85 87.970~87.980 87.85
Piston-to-cylinder
clearance
0.030~0.050 0.12 0.040~0.060 0.1 0.045~0.065 0.1
Piston-to-piston pin
bore clearance
0.004~0.016 0.08 0.004~0.016 0.08 0.004~0.016 0.08
Piston Pin bore I.D.
18.002~18.008 18.042 18.002~18.008 18.042 20.002~20.008 20.042
Pin O.D.
17.992~17.998 17.94 17.992~17.998 17.95 19.992~19.998 19.94
PISTON RINGS Ring side clearance
Ring,Top
0.08~0.12 0.10 0.02~0.06 0.15 0.02~0.06 0.15
Ring, Compression
0.07~0.11 0.10 0.02~0.06 0.15 0.02~0.06 0.15
Ring Assy, Oil
0.02~0.16 0.15 0.02~0.16 0.15 0.04~0.19 0.15
Ring end gap
0.15~0.35 1.0 0.20~0.35 1.0 0.20~0.40 1.0
Ring width
Ring,Top
1.420~1.440 1.3 1.97~1.99 1.75 1.97~1.99 1.75
Ring, Compression
1.420~1.440 1.3 1.97~1.99 1.75 1.97~1.99 1.75
Ring Assy, Oil
2.37~2.49 2.3 2.77~2.79 2.5 2.65~2.78 2.5
CONNECTING ROD Small end I.D.
18.011~18.022 18.06 18.011~18.022 18.06 20.011~20.022 20.06
Big end I.D.
30.02~30.03 30.06 33.02~33.03 33.06 36.02~36.03 36.06
Big end oil clearance
0.030~0.055 0.1 0.029~0.055 0.1 0.029~0.064 0.1
Big end side clearance
0.95~1.45 1.85 0.55~1.25 1.65 0.55~1.25 1.65
CRANKSHAFT Crankshaft O.D.
29.975~29.990 29.92 32.975~32.991 32.92 35.966~35.991 35.92
VALVES Valve clearance
IN
0.10~0.15 - 0.10~0.15 - 0.10~0.15 -
EX
0.20~0.25 - 0.20~0.25 - 0.20~0.25 -
Stem O.D.
IN
5.468~5.48 5.318 6.568~6.580 6.44 6.568~6.580 6.44
EX
5.418~5.44 5.275 6.545~6.560 6.40 6.545~6.560 6.40
Guide I.D. IN/EX
5.500~5.512 5.572 6.600~6.615 6.66 6.600~6.615 6.66
Stem clearance
IN
0.020~0.044 0.1 0.020~0.070 0.11 0.020~0.070 0.11
EX
0.060~0.084 0.12 0.040~0.070 0.15 0.020~0.070 0.15
Seat width
0.7~0.9 2.0 0.8~1.0 2.0 0.7~0.9 2.0
Spring free length
30~31 29.0 38.5~39.5 37.5 38.5~39.5 37.5
* unless otherwise noted