CRANKSHAFT, PISTON AND CONNECTING ROD
76
Engine specifications chart
Table 1:
Specification 61 65 70
Bore (new) 2.4” (61mm) 2.6” (65mm) 2.76” (70mm)
Displacement 7.5 in^3 (123 cc) 10.9 in^3 (179cc) 12.7 in^3 (208 cc)
Service limits
Bore maximum diameter 2.386” (61.17mm) 2.566” (65.168mm) 2.763” (70.180mm)
Crank journal (flywheel end) Min. diameter 0.970” (24.879mm) 0.970” (24.879mm) 0.970” (24.879mm)
Crank journal (PTO end)
min. diameter
0.970” (24.879mm) 0.970” (24.879mm) 0.970” (24.279mm)
Crank pin min. diameter 1.02” (24.849mm) 1.168” (29.942mm) 1.168” (29.942mm)
Connecting rod max. ID (crank side) 1.173” (30.071mm) 1.173” (30.071mm)
Connecting rod to crank pin max. running clear-
ance
0.002” (.057mm) 0.002” (.063mm) 0.002” (.063mm)
Connecting rod to crank pin max. side clearance 0.048” (1.238mm) 0.037” (0.952mm) 0.037” (0.952mm)
Crank shaft run out (max) 0.001” (.025mm) 0.001” (.025mm) 0.001” (.025mm)
Crank shaft end play (max) 0.014” (.350mm) 0.011” (.275mm) 0.011” (.275mm)
Crank shaft bearing max. ID (cylinder block) 2.046 (52.470mm) 2.046 (52.470mm) 2.046 (52.470mm)
Crank shaft bearing max. ID (crank case cover) 2.046 (52.470mm) 2.046 (52.470mm) 2.046 (52.470mm)
Cam shaft min OD (cylinder block side) 0.551” (14.131mm) 0.551” (14.131mm) 0.551” (14.131mm)
Cam shaft min OD (sump side) 0.551” (14.131mm) 0.551” (14.131mm) 0.551” (14.131mm)
Cam shaft bearing max. ID (cylinder block) 0.556” (14.248mm) 0.556” (14.248mm) 0.556” (14.248mm)
Cam shaft bearing max. ID (sump) 0.556” (14.248mm) 0.556” (14.248mm) 0.556” (14.248mm)
Intake lobe min. height 1.078” (27.628mm) 1.078” (27.628mm) 1.078” (27.628mm)
Exhaust lobe min. height 1.078” (27.628mm) 1.078” (27.628mm) 1.078” (27.628mm)
Compression ring max. end gap 0.029” (.750mm) 0.029” (.750mm) 0.029” (.750mm)
Scrapper (second) ring max. end gap 0.029” (.750mm) 0.029” (.750mm) 0.029” (.750mm)
Compression ring to land max. clearance 0.009” (.233mm) 0.004” (.100mm) 0.004” (.100mm)
Scrapper ring to land max. clearance 0.009” (.233mm) 0.004” (.100mm) 0.004” (.100mm)
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