Re: Johnson AD needs help

[frankr]

Funny (or not), I just got done explaining what causes that. viewtopic.php?f=2&t=11048. It is caused by water intrusion into the crankcase. You can plainly see the corrosion pitting near the wrist pin on the piston on the right. It usually from a bad carbon seal at the bottom of the crankshaft/top of drive shaft. But can also be a pin-holed exhaust cover plate, or leaking head gasket. Once the water gets in there, it is circulated throughout the powerhead by the oiling system. I’ve seen lots of them. Any normal, sane person would jump to conclusions and blame it on the oil. Wrong conclusion.