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Old 10-12-2015, 04:57 PM   #19
Nomad Willy
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City: Concrete Washington State
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 18,743
Here's my garage VoDo for the day ..
I always mix six parts distilled water w four parts no-diluted AF. Learned of that option from my BMW motorcycle manual. Long life AF as recomended in my manual. I think they would all recomend the 60-40 ratio but they probably are trying to keep it simple.
Then I mix up more than I need not being too fussy about how much more. I keep the extra on hand and label it "Mix". I drain after waiting a few minutes after a 20 min run for warm up. Then I drain through a ball valve that i installed for the purpose on the lowest point in the engine cooling system. I removed the original square head plug in this port on the after end of the block on the service side .. stbd.
Then I fill ... very slowly. And I think the "slowly" part is fairly important. Especially w hot water tank to engine plumbing and bus heater plumbing. I fill mine starting at the exhaust manifold and then finish by removing a pipe cap near the bus heater inside my setee. It's the highest point in the system.
Not done yet. I keep filling it untill it is 100% full at the bus heater and 3/4" down from the filler cap hole in the exhaust manifold. I assume all the air is bled out of the system through the vent w the cap bye the bus heater.

Flushing?
I've only flushed once and did it w radiator flush mixed at about a 25% level. Then flushed again w distilled water. I've never put anything but distilled water and the small amount of flush mentioned pluss the LLAF. I use extended life AF but probably don't need it as I made a point of having no aluminum engine parts exposed to coolant anywhere in the system. My manifold is a weldment of steel. Made by Klassen. They have been using these steel manifolds since the 60's.

Also I use a Murphy Switch that sounds an alarm when the coolant is down some. Probably saved our bacon once. Just one of the things I did on the repower.

I don't know if I'm subject to the cavitation issue or not. Intend to ask my engine supplier next time I'm in Seattle.
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Eric

North Western Washington State USA
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