Reply To: 1972 85 hp V4 overheated…..

[amuller]

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Thanks billw!

Plugs similar and normal (I think). L77JC4. (Anybody think fine wire plugs are an improvement for this sort of application?)

Compression (1) 135 psi, (2) 130 psi, (3) 133 psi (4)135 psi. (I think this is what this motor has has shown me before.)

Engine seems to start, and run, and pump, normally on muffs.

So why did it stop pumping/overheat? I’ll drop the lower unit and check the pump but am wondering about something like a plastic bag or some plant life wrapped around the leg.

Are the hot horn sensors generally reliable? In this case I think it did not go off until there was already a power loss. The manual has procedures for testing that I can try.

Puzzled…..