38
3) Cylinder
block
Inspection and service
(1) Check for crack, damage and distortion on the top of
the block in the same way as in the cylinder head.
(2) Measurement of cylinder bore
➀
There should be no scratch, rust, corrosion, etc. on
the cylinder bore when checked visually.
➁
Measure the cylinder bore at the top, center and
bottom respectively in the crankshaft direction (A)
and the direction at right angle to it (B). If the repair
value is exceeded, finish to an oversize by boring.
➂
The above-described bore top corresponding to the
top ring position at the piston TDC about
10 mm
below the cylinder block top surface, and the
bottom corresponds to the oil ring position at the
BDC about
100 mm
below the cylinder block top
surface.
➃
Use a cylinder gauge (inside dial gauge) for the
measurement. Apply the gauge correctly at right
angle to the bore wall surface.
➄
Cylinder honing shall be conducted by boring
according to the following specifications. Horning
specifications (2-step honing according to Dia
specifications)
●
Grinding
stone:
Rough finishing:
Tokyo Dia SD120/140
N100M (bronze type)
Finishing:
GC600JB
●
Grinding stone size: 100L × 4W
●
Speed:
162
rpm
●
Axial feeding speed: 13 m/min
●
Gauge
pressure:
Rough
finishing:
15kgf/cm
2
Finishing:
5
kgf/cm
2
●
Finishing
stroke: 9
●
Honing allowance: 0.04 mm (diameter)
●
Cross hatch overall angle:
40°
●
Surface roughness: 2 – 4 µ
Distortion on cylinder block top surface (mm)
Standard assembling value
Repair value
Less than 0.05
More than 0.12
T119
(Unit: mm)
Model
Standard assembling
value
Repair value
S753
∅
75 -
∅
75.019
∅
75.2
S773
·
S773L
∅
77 -
∅
77.019
∅
77.2
Standard
assembling value
Repair value
∅
75.5 –
∅
75.519
∅
75.7
∅
77.5 –
∅
77.519
More than
∅
77.7
Standard
assembling value
Repair
value
∅
76 -
∅
76.019
More than
∅
76.2
1st boring
0.5
1st boring
0.5
2nd boring
0.5
Replace the block.
Summary of Contents for ST318
Page 1: ......
Page 4: ...3 Chapter 1 GENERAL...
Page 27: ...26...
Page 28: ...27 Chapter 2 ENGINE Tractor Model Engine Model ST318 S753 ST321 S773 ST324 S773L...
Page 29: ...28 2 1 Engine Sectional View T100 T101...
Page 48: ...47 13 Oil flow T140...
Page 98: ...97 Chapter 3 TRACTOR MAIN BODY...
Page 132: ...131 2 HYDROSTATIC TRANSMISSION 1 SPEED PTO MID PTO 1 Sectional view T505 T506...
Page 154: ...153 Take out the swash plate from the case T566...
Page 194: ...193 Model 9 3 shown...
Page 199: ...198 4 CONTROL VALVE 1 Control valve relief valve 340013400 1 Name of components T658...
Page 203: ...202 2 Control valve for lifting lowering implement 340016110 1 Name of components T667...
Page 223: ...221...
Page 224: ...222...
Page 225: ...223...
Page 226: ...224...
Page 228: ...226 4 LIGHTEING CIRCUIT T702...
Page 229: ...227 5 HORN CIRCUIT T703...
Page 230: ...228 6 FUEL LEVEL CIRCUIT T704...
Page 231: ...229 7 ENGINE STOP SOLENOID CIRCUIT T705...
Page 232: ...230 8 ENGINE COOLANT TEMPERATURE CIRCUIT ENGINE OIL PRESSURE WARNING CIRCUIT T706...
Page 233: ...231 9 HST CRUISE CONTROL CIRCUIT T707...
Page 234: ...232 10 PARKING BRAKE WARNING LIGHT CIRCUIT T708...
Page 235: ...233 11 BRAKE LAMP CIRCUIT T709...
Page 236: ...234 12 SAFETY START CIRCUIT T710...
Page 237: ...235 13 FLASHER AND HAZARD LUMP CIRCUIT T711...
Page 238: ...236 14 GLOW PLUG AND GLOW LAMP CIRCUIT T712...
Page 239: ...237 15 ALTERNATOR AND ENGINE STOP SOLENOID CIRCUIT T713...