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Old 02-27-2011, 10:29 AM   #1
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Join Date: Nov 2003
Location: Twin Falls, Idaho
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SEA engine bell housing sizes

How To Determine The SAE Number. Take a look at the chart below. Stand facing the bell housing while it is attached to the engine and simply measure across the face of it to get the SAE number. To check your measurement you can also count the number of bolt holes, bolt diameter and bolt size. Generally speaking, most small engines like a Perkins 4108 are SAE 5, engines from 60 to 80 HP like a Continental F163 or Perkins 4236 are usually SAE 4 or 3, and engines above 150 HP are usually SAE 2 or larger. Because the tendency in the last 20 years or so is to have smaller bell housings, it is now uncommon to see a SAE 1, SAE , or SAE 0. But they do exist.

No. Diameter No. Bolts Hole Diameter Size
1 20.875 12 .469 7/16
2 18.375 12 .433 3/8
3 16.875 12 .433 3/8
4 15.00 12 .433 3/8
5 13.125 8 .406 3/8
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