Re: ’55 Johnson 25 hp head questions

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September 18, 2016 at 6:06 pm #44252
frankr
Participant

    I suspect water intrusion also. First thing that comes to mind is the lower crankshaft seal. What is the model number? You can tell from that if it has the seal disaster problem. Another suspect is a possible pin hole through the exhaust cover baffle plate, allowing water to squirt in through the exhaust ports. RD-17S and RD-17R have the problematic seal.