Tecumseh AH520 - Page 59

56
TABLE OF SPECIFICATIONS
Reference Column 18 19 20 21 22
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 2.4375 61.913 2.437 61.900
2.094 53.188 2.094 53.188 2.094 53.188 2.4385 61.938 2.438 61.925
Stroke 1.750 44.45 1.410 35.814 1.250 31.75 1.750 44.45 1.750 44.45
Cu. In. Displacement 6.02 98.7 4.80 78.7 4.40 72.1 8.17 133.9 8.17 133.9
(in
3
) (cc)
Point Gap .020 .508 .017 .432 .017 .432 .020 .508 .020 .508
Timing .070 1.778 .100 2.54 .122 3.099 .118 2.997 .115 2.921
B.T.D.C.
Spark Plug Gap .030 .762 .030 .762 .030 .762 .030 .762 .030 .762
Piston Ring .006 .152 .007 .178 .007 .178 .007 .178 .007 .178
End Gap .016 .406 .017 .432 .017 .432 .017 .432 .017 .432
Piston 2.0870 53.01 2.0870 53.01 2.0870 53.01 2.4302 61.727 2.4302 61.727
Diameter 2.0880 53.035 2.0880 53.035 2.0880 53.035 2.4312 61.753 2.4312 61.753
(Top) .0645 1.638 .0645 1.638 .0655 1.664 .0655 1.664 .0655 1.664
.0655 1.664 .0655 1.664 .0665 1.689 .0665 1.689 .0665 1.689
.0645 1.638 .0645 1.638 .0645 1.638 .0645 1.638 .0645 1.638
(Bot.) .0655 1.664 .0655 1.664 .0655 1.664 .0655 1.664 .0655 1.664
Piston Ring .0615 1.562 .0615 1.562 .0615 1.562 .0615 1.562 .0615 1.562
Width .0625 1.587 .0625 1.587 .0625 1.587 .0625 1.587 .0625 1.587
Piston Pin .4997 12.692 .4997 12.692 .4997 12.692 .4997 12.692 .4997 12.692
Diameter .4999 12.675 .4999 12.675 .4999 12.675 .4999 12.675 .4999 12.675
Crank Pin Journal .8442 21.443 .5614 14.26 .5611 14.252 .6259 15.898 .6919 17.574
Diameter .8450 21.463 .5621 14.277 .5618 14.270 .6266 15.916 .6927 17.595
Crankshaft .6691 16.995 .6691 16.995 .6691 16.995 .6691 16.995 .6691 16.995
P.T.O. Side .6695 17.005 .6695 17.005 .6695 17.005 .6695 17.005 .6695 17.005
Main Brg. Dia.
Crankshaft Ball Bearing
Magneto Side .9998 25.395 .6691 16.995 .6691 16.995 .8745 22.212 .8748 22.223
Main Brg. Dia. 1.0003 25.408 .6695 17.005 .6695 17.005 .8750 22.225 .8753 22.233
See Note A
Crankshaft None None None None None None None None None None
End Play
NOTE A: Needle Bearing
* Does not apply to units with Solid State Ignition.
Piston Ring
Groove Width
.7498
.7503