Tecumseh AH520 - Page 57

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TABLE OF SPECIFICATIONS
Reference Column 9C 10A 10B 11 12
U.S. Metric U.S. Metric U.S. Metric U.S. Metric U.S. Metric
mm mm mm mm mm
Bore 2.093 53.162 2.093 53.162 2.093 53.162 2.093 53.162 2.093 53.162
2.094 53.188 2.094 53.188 2.094 53.188 2.094 53.188 2.094 53.188
Stroke 1.500 38.1 1.750 44.45 1.750 44.45 1.750 44.45 1.410 35.814
Cu.In. Displacement 5.20 85.2 6.00 98.3 6.00 98.3 6.00 98.3 4.80 78.7
(in
3
) (cc)
Point Gap .020 .508 .018 .457 .020 .508 .018 .457 .017 .432
See Note 4
Timing .078 1.98 .090 2.286 .087 2.21 .100 2.54 .135 3.429
B.T.D.C. See Note 2 See Note 3
Spark Plug Gap .030 .762 .030 .762 .030 .762 .030 .762 .030 .762
Piston RIng .006 .152 .007 .178 .006 .152 .006 .152 .007 .178
End Gap .016 .406 .017 .432 .016 .406 .014 .356 .017 .432
Piston 2.0870 53.01 2.0870 53.01 2.0870 53.01 2.0873 53.017 2.0870 53.01
Diameter 2.0880 53.035 2.0880 53.035 2.0880 53.035 2.0883 53.043 2.0880 53.035
(Top) .0655 1.664 .0655 1.664 .0665 1.689 .0655 1.664 .0655 1.664
.0665 1.689 .0665 1.689 .0975 2.477 .0985 2.413 .0665 1.689
.0645 1.638 .0645 1.638 .0645 1.638 .0955 2.426 .0645 1.638
(Bot.) .0655 1.664 .0655 1.664 .0655 1.664 .0965 2.451 .0655 1.664
Piston Ring .0615 1.562 .0615 1.562 .0615 1.562 .0615 1.562 .0625 1.587
Width .0625 1.587 .0625 1.587 .0625 1.587 .0935 2.375 .0925 2.349
Piston Pin .4997 12.692 .4997 12.692 .4997 12.692 .4997 12.692 .4997 12.692
Diameter .4999 12.697 .4999 12.697 .4999 12.697 .4999 12.697 .4999 12.697
Crank Pin Journal .8442 21.443 .6857 12.417 .8442 21.443 .6857 17.417 .5614 14.26
Diameter .8450 21.463 .6865 17.437 .8450 21.463 .6865 17.437 .5621 14.277
Crankshaft .9998 25.395 .8745 22.212 .9998 25.395 .8745 22.212 .6691 16.995
P.T.O. Side 1.0003 25.408 .8750 22.225 1.0003 25.408 .8750 22.225 .6695 17.005
Main Brg. Dia.
Crankshaft .6691 16.995 .7495 19.037 .7498 19.045 .7495 10.037 .6691 16.995
Magneto Side .6695 17.005 .7500 19.05 .7503 19.058 .7500 19.05 .6695 17.005
Main Brg. Dia.
Crankshaft None None .003 .076 .003 .076 .003 .076 None None
End Play .016 .406 .016 .406 .016 .406
NOTE 2: 642-24, 26, 29 B.T.D.C. = .087
NOTE 3: 643-13 B.T.D.C. = .095
NOTE 4: 643-93A, 05A, 13, 14 = .020
Piston Ring
Groove Width