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That part of the cooling system must be 100% right by the book, your Alpha pump is at the bottom most point, any leak point will bleed off water pressure and remember that water has to travel UP about 18" to go through the transom mount and then, about 3.5' forward up to the engine. My OMC...

https://corecheminc.com/wp-content/uploads/2020/06/Freeze-Point-Chart-GlycoChill-Propylene-Glycol-Heat-Transfer-Fluid.pdf This shows how to mix PG antifreeze if you want to use it for both winterizing and as an engine coolant. If you go up to 70% PG/30% water it brings you to 230* boil protection.

As long as you are OK with the lowered levels of freeze protection (-29 for PG vs -34 for EG) and boil protection (220 for PG vs 265 for EG) there's no reason why you couldn't use it for an engine coolant as well as winterizing your raw water side. In fact I'm going to do some more research and...

That's a good deal, then mixed 50/50 that's costing you only $11 per gallon. Much better than -60! When I run out of my stock of Sierra I will try that thanks for the tip!

ACE hardware used to sell it, I got it from Amazon last time, a case of 6 gallons that would last me a LONG time (each gallon makes 2 gallons of AF, like 3 years worth)...

Sounds like the best of all worlds. Next season I’m going to use the local boat yard’s water taxi service because I’m about done with rowing out in a dinghy to get out to the boat.

I mix 50/50 & that gives you a freeze protection of -26*F. Yes it is really an engine coolant the main difference between it (PG) and other engine coolants (EG) is mixed at the same %age it doesn’t provide as much freeze or boil over protection but for this purpose it’s fine. You could always...

Well…. I used to complain about having to get the boat bottom painted & doing the outdrive myself each year but after hearing what a nuisance trailering is every time you use the boat I’m glad I live 1/4 mile from the beach and keep it on a rotating mooring. That and the trailer stays in very...

Watch out for the windshield washer stuff the alcohol in it is methanol which is poisonous; not ethanol which of course is not…

You'd do better putting a sail on it.

Are you in fresh water or salt? If in salt the manifolds & elbows are way past due.

In that case then I’m thinking module or coil…

Are you sure that the cap, rotor & wires are good, just for fun, ohm out the wires and see what you get. We had a 3 year old Toyota Camry 4 cyl years ago that all the sudden started running on 2 cyls, when I checked the wires, two were totally dead. Very strange, igniton problems are not common...

What I said. Torsions are OK on a single axle but on multi axle trailers one or more can be overloaded, so the axles should have extra capacity vs spring axles that share loads.

Power may be transmitted but the plug may foul for a variety of reasons and not fire properly... reasons: oil leaking past valve seals carb set too rich

Given what you said, it may be that the module in the Prestolite is bad. Last I heard those were NLA but I bet you could convert it to a Petronix (aftermarket electronic conversion) they don't cost much either. First though make sure you have enough voltage at the coil as Kenny said.

FWIW, I'd either use my mix of Sierra/water, or -100, or just leave it dry I don't trust the other stuff even though it is widely used. In my climate a -75 might be fine if I didn't want to mix but its harder to find. However, I feel that the corrosion inhibitors in the better AF do reduce...

What's the voltage reading at the positive terminal on your coil when you turn the ignition to on but not starting the engine? I had a low voltage to the coil problem on my OMC for years before I tracked it down. After that much better starting and running.

https://www.volvopentastore.com/Distributor-855705/dm/store_id.366--view_id.789715 I think this is what you should have, which appears to be the Prestolite BID system, it has an electronic module but still uses centrifugal advance like the points distributors did. Might try replacing the cap n...

if you get temps down to zero and want to use -50 or -60 try putting it in the freezer at zero & see what happens…it gets hard…to me that means it doesn’t belong in a cast iron engine that will see temps that low. I mix up my own Sierra PG antifreeze with water. Mixed 50/50 it gives freeze...