Marinette Boat Forum

New boat. Single 318 - 1973 express.

I just had the water pump and seacock replaced. On my maiden voyage, it ran beautifully.. Until it warmed up.

Once it warms up, it dies. Does turn over but won't start till it cools down.

Pretty bummed because I just painted it and drifted into a tug!

Any help would be huge!

Need more info. Did you check for spark? That would be a good place to start. Also, if you find yourself adrift, drop anchor if you can safely do so. Or prepare to fend off if it's not possible. Use your radio. If there are other boaters nearby they might throw you a line and tow you to safety. Channel 16/9 hailing channels.

Try replacing the distributor cap. I have had similar problem and that was the culprit. Moisture gets under the cap and then turns to vapor when it gets hot.

And before Bill asks you to do so, please fill in your signature so we know more about what equipment and power you have. Help us to help you.

It could be the coil.

Update sig line - Thank you! And the anchor wasn't an option because I was in a tight river when she stalled (tick tick BANG)

I never considered the cap. Might explain why I also have an issue with the ignition breaker popping if I throttle down too fast - for another thread (((

It's really strange because if it runs idle for 15 minutes, it just stalls out. I am able to crank it but it doesn't begin to respond until about 15 minutes later. Another boater made a suggestion to check the thermostat but my temp is good now that the pump was replaced.

I had an incident last week where the seacock failed and I blew the impeller which made a hell of a noise.

After we fixed it today, she purred like a kitten until she didn't.

Really appreciate the insight. I'd be lost without this forum

D

I have the same boat only 1972. I encountered the same problem just last week and found that after changing fuel filters the problem went away. The inline filter was pulling trash to the outlet and after the engine quit the trash was released back to the filter until I ran her again. Just a thought. While I'm on, can anyone give me a hint as to how I can get this damn thing to back to starboard. Absolutely will not do it. I understand prop rotation determines this but you would think that with rudder full to starboard it might at least back straight.

I have the same boat only 1972. I encountered the same problem just last week and found that after changing fuel filters the problem went away. The inline filter was pulling trash to the outlet and after the engine quit the trash was released back to the filter until I ran her again. Just a thought. While I'm on, can anyone give me a hint as to how I can get this damn thing to back to starboard. Absolutely will not do it. I understand prop rotation determines this but you would think that with rudder full to starboard it might at least back straight.

HA! Yeah, its a new filter and I'm running it out of a 2 gallon gas can to be sure that I don't have a clog in the line. The guy who sold me the boat suggested I clean the fuel tanks so I removed it from the equation.

Run it until it stalls, pull a spark plug wire and stick an old spark plug in and ground it to the block. If no spark you have an ignition problem. Coils can get hot and break down. Ballast resistor could be bad. Moisture under distributor cap usually causes problems at higher rpm. But that is definitely easy to check and you can wipe out the moisture after a quick shot of WD40. ( As Fastjeff says, yellow spark is NO spark). Good luck.