Toro Groundsmaster 328-D, Service Manual

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Engine (cont.)
Item Standard Specification Repair Limit Service Limit
Piston
Type Solid
Material
Aluminum alloy
Piston Outside Diameter (skirt end) 73 mm (2.874 in.)
Piston to Cylinder Wall Clearance 0.3 mm (0.012 in.)
Oversize 0.25, 0.50, 0.75 mm
(0.01, 0.02, 0.03 in.)
Piston Pin
Type Semi-floating
Outside Diameter
19 mm (0.748 in.)
Pin to Piston Clearance 0.08 mm (0.003 in.)
Pin to Connecting Rod Clearance Press-fit load: 1000 + 500 kg
(2200 + 1100 lb.)
Piston Rings
Number of Rings
3 Compression No. 1: Chrome plated, semi-keystone type
No. 2 and No. 3: Tapered
1 Oil Chrome plated ring with coil expander
Compression Ring Width 2 mm (0.079 in.)
Oil Ring Width 3 mm (0.118 in.)
Compression Ring Side Clearance
No. 1 0.06 - 0.12 mm (0.0024 - 0.005 in.) 0.3 mm (0.012 in.)
No. 2 0.05 - 0.09 mm (0.002 - 0.004 in.) 0.2 mm (0.008 in.)
Oil Ring Side Clearance 0.03 - 0.07 mm (0.001 - 0.003 in.) 0.2 mm (0.008 in.)
Ring Gap 0.15 - 0.40 mm (0.006 - 0.016 in.) 1.5 mm (.060 in.)
Connecting Rod
Type Forged I-beam
Bend and Twist 0.05 mm (0.002 in.) max. 0.15 mm (0.006 in.) max.
Big End Thrust Clearance 0.1 - 0.35 mm (0.004 - 0.014 in.) 0.5 mm (0.02 in.)
Connecting Rod Bearings
Oil Clearance 0.15 mm (0.006 in.)
Undersize 0.25, 0.50, 0.75 mm
(0.01, 0.02, 0.03 in.)
Crankshaft
Type Fully counterbalanced
Bend Within 0.03 mm (0.001 in.) 0.05 mm (0.002 in.)
End Play 0.05 - 0.205 mm (0.002 - 0.008 in.)
Journal O.D. 52 mm (2.047 in.) – 0.15 mm (– 0.006 in.) – 0.95 mm (– 0.037 in.)
Pin O.D. 42 mm (1.654 in.) – 0.15 mm (– 0.006 in.) – 0.95 mm (– 0.037 in.)
Finish Undersize
Journal U.S. 0.25 mm (0.01 in.) 51.735 - 51.750 mm
(2.0368 - 2.0374in.)
Journal U.S. 0.50 mm (0.02 in.) 51.485 - 51.500 mm
(2.0270 - 2.0276 in.)
Journal U.S. 0.75 mm (0.03 in.) 51.235 - 51.250 mm
(2.0171 - 2.0177 in.)
Pin U.S. 0.25 mm (0.01 in.) 41.700 to 41.715 mm
(1.6417 - 1.6423 in.)
Pin U.S. 0.50 mm (0.02 in.) 41.450 - 41.465 mm
(1.6319 - 1.6325 in.)
Pin U.S. 0.75 mm (0.03 in.) 41.200 - 41.215 mm
(1.6220 - 1.6226 in.)
Specifications Page 4 - 6 Groundsmaster
®
300 Series