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Flywheel Key Keeps Shearing in Half

I own an Intek OHV 18.5 HP Briggs & Stratton engine on a Craftsman riding lawn mower. While mowing, the engine suddenly began to run erratically and backfire. I discovered that the flywheel key had broken; the main flywheel bolt was only hand tight when removed. I installed a new key & tightened the bolt. The engine started & ran perfectly for about 10 minutes, but when revved slightly began to run erratically again. Inspection revealed that the flywheel key had again sheared in half. what's the problem here with these keys? I don't have the flywheel bolt torque value, but suspect that it needs to be tighter, since the crankshaft where the flywheel attaches is cone shaped.

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4 Suggested Answers

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Posted on Jan 02, 2017

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panilling9
  • 284 Answers

SOURCE: what kind of oil for a husqvarna riding mower?

Yes Briggs and Stratton recommends sae 30 in most all their engines even overhead valve (OHV)
Kohler uses 10w-30 in most of their overhead valve engines

Briggs has their own bottled oil with their label and additives and can find at lowes
Kohler the same

Posted on Jun 14, 2009

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bbreton
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SOURCE: shearing of flywheel pin on starting 12 hp snapper

When you the key this time, put the flywheel on first then the key but this time use a little grit between the flywheel and crankshaft. Something like grinding compound. It will keep the flywheel from moving plus make sure you torque down the flywheel nut good.
HTH
Good Day.

Posted on Oct 29, 2009

  • 14 Answers

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search google for diaigram

Posted on Sep 22, 2012

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