LONCIN LC2P73F - Maintenance Standards and Limits

Part II Repair Instructions
- 8 -
2-3 Maintenance standards
Unspecified unit: mm
Part Item
Standard Service Limit
LC2P73F LC2P73F
Engine Ile speed (1800±150) rpm
－
Cylinder head Warpage － 0.05
Cylinder
Sleeve(inside diameter X) φ73.0~φ73.01 φ73.1
Sleeve(inside diameter Y)
φ73.0~φ73.01 φ73.1
Piston
Skirt outside diameter φ72.965～φ72.975 φ72.755
Clearance to cylinder 0.025～0.045 0.255
Piston pin bore inside diameter
φ17.002～φ17.008 φ17.12
Piston – pin clearance 0.004～0.016 0.029
Piston pin Outside diameter φ16.992～φ16.998 φ16.95
Piston ring
Side clearance (top/ the second )
0.02～0.06
0.11
End gap (top ) 0.15～0.30 0.40
End gap (the second ) 0.20～0.40 0.45
Width (top) 1.17～1.19 1.1
Width (second) 1.17～1.19 1.1
Width (oil ring) 1.87～1.97 1.8
Connecting rod
Small end inside diameter φ17.006～φ17.017 φ17.05
Big end inside diameter φ38.015～φ38.025 φ38.065
Big end side clearance 0.024～0.059 0.145
Crankshaft Crackpin outside diameter φ37.961～φ37.976 φ37.92
Valve
Clearance(cold) (intake) 0.10～0.15 －
Clearance(cold) (exhaust) 0.10～0.15 －
Stem diameter (intake) φ6.565～φ6.58 φ6.515
Stem diameter (exhaust) φ6.545～φ6.56 φ6.495
Valve guide
Inside diameter (intake, exhaust) φ6.6～φ6.615 φ6.665
Stem to guide clearance (intake) 0.02～0.05 0.15
Stem to guide clearance exhaust) 0.04～0.07 0.17
Valve seat
Seat width(intake) 1.1～1.2 1.7
Seat width (exhaust) 1.4～1.5 2.0
Valve spring Free length 39.5～40.5 39
Cam shaft
Height (intake) 29.95～30.05 29.75
Height (exhaust) 29.95～30.05 29.75
Outside diameter (bearing) φ15.966～φ15.984 φ15.916
Crankcase cover
Camshaft hole diameter φ16.0～φ16.018 φ16.068
Crankshaft hole diameter φ40.009～φ40.025 φ40.075
Spark plug Gap (0.7-0.8)mm －
Igniter coils
Gap to flywheel (0.3-0.4)mm －
* value at the speed 1400rpm of the engine.