Toro 159cc, Service Manual

Page: 9 / 46

5
Engine Specifications
Part Item Standard Service Limit
Engine Operating RPM 2900
– 3100 RPM
－
Cylinder Head Warpage
－
0.00393” (0.10 mm)
Cylinder
Sleeve Taper / Out of Round
(Inside Diameter)
2.559” (65.0 mm) 2.566” (65.165 mm)
Piston
Skirt Outside Diameter
2.558” (64.985 mm) 2.553” (64.845 mm)
Cylinder Clearance 0.00059 -
0.00196” (0.015-0.05 mm) 0.00472” (0.12 mm)
Piston Pin Bore Inside Diameter
0.5118” (13.002 mm) 0.5137” (13.048 mm)
Piston Pin Clearance 0.00007-
0.0005” (0.002-0.014 mm) .00314“ (0.08 mm)
Piston Pin Outside Diameter
0.5118” (13.0 mm) 0.51” (12.954 mm)
Piston Rings
Ring To Groove (Top and Middle) 0.00059 -
0.00177” (0.015-0.045 mm) 0.0059” (0.15 mm)
End Gap (Top and Middle) 0.0078 -
0.0157” (0.2-0.4 mm) 0.0393” (1.0 mm)
Width (Top and Middle)
0.059” (1.5 mm) 0.0539” (1.37 mm)
Width (Oil Ring)
0.0984” (2.5 mm) 0.0933” (2.37 mm)
Connecting Rod
Small End Inside Diameter
0.5125” (13.02 mm) 0.5145” (13.07 mm)
Big End Inside Diameter
1.0244” (26.02 mm) 1.0263” (26.07 mm)
Big End Oil Clearance 0.00157 -
0.00248” (0.04-0.063 mm) 0.0047” (0.12 mm)
Big End Side Clearance 0.00393 -
0.02755” (0.1-0.7 mm) 0.0433” (1.1 mm)
Crankshaft Crackpin Outside Diameter
1.0228” (25.98 mm) 1.0204” (25.92 mm)
Valve
Clearance (cold) (Intake) 0.0039
” (0.10 mm) －
Clearance (cold) (Exhaust)
0.0059” (0.15 mm)
－
Stem Diameter (Intake)
0.2157” (5.48 mm) 0.2093” (5.318 mm)
Stem Diameter (Exhaust)
0.2141” (5.44 mm) 0.2076” (5.275 mm)
Valve Guides
Inside Diameter (Intake, Exhaust)
0.2165” (5.50 mm) 0.2193” (5.572 mm)
Stem to Guide Clearance (Intake)
.00039” - 0.0013” (0.01-0.034 mm) .00393” (0.10 mm)
Stem to Guide Clearance (Exhaust) 0.0019 -
0.0027” (0.05-0.070 mm) 0.0047” (0.12 mm)
Valve Seat Seat Width
0.0314” (0.8 mm) 0.0787” (2.0 mm)
Valve Spring Free Length
1.2007” (30.5 mm) 1.1417” (29.0 mm)
Camshaft
Height (Intake)
1.0905” (27.7 mm) 1.0807” (27.45 mm)
Height (Exhaust)
1.0925“ (27.75 mm) 1.0826” (27.50 mm)
Journal (Bearing)
0.5505” (13.984 mm) 0.5478“ (13.916 mm)
Crankcase Cover
Camshaft Hole Diameter
0.5511” (14.0 mm) 0.553” (14.048 mm)
Crankshaft Hole Diameter
1.0” (25.4 mm) 1.00472” (25.52 mm)
Spark Plug Gap 0.0275 -
0.0314” (0.7-0.8 mm)
－
Ignition Coil
Resistance (Primary) 1.1-
1.6 Ω
－
Resistance (Secondary)
10.5 KΩ +/- 15%
－
Gap to Flywheel
.01” (0.254 mm)
－
NOTE: The only internal parts available for this engine are gaskets and seals.
1