Re: 7.5hp late 50s mdl 7520 carbon coating

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January 6, 2016 at 10:28 pm #29715
frankr
Participant

    Often neglected item: The carbon seal on the top end of drive shaft/bottom end of crankshaft. If damaged or missing, water can enter the bearing. Then the oiling system pumps it to the top bearing, where it enters the crankcase. Sometimes results in thrown upper connecting rod. People like to blame that on oil, but it was water damage.