Thanks for the diagram! I know there have been a lot of good suggestions here. I’m not at the boat during the weeks days so just trying to gather as much info as I can before I head back down there this coming weekend.
Questions about my need to me engine.
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Originally posted by ndutton View PostYou always have full flow through the manifold regardless of thermostat position, even if you have no thermostat. As I offered earlier, an infrared temp gun measuring head temperatures would be an excellent diagnostic tool. Also, you can guaranty water flowing through the block if you obstruct the bypass hose, thermostat installed or not. If there's any uncertainty, the bypass hose is the one right next to the starter. Even a pair of vice grips will do in a pinch.
From there, you can get a permanent temp gauge working and you'll know that it's working properly.
While you're verifying temps, try using the vise grips on the bypass (use a cloth to protect the hose) and observe the temp changing.
Those simple tests will give you some confidence in your engine cooling for your upcoming trip.
Finally, here is a very good read related to your current questions.-Jerry
'Lone Ranger'
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1978 RANGER 30
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Wow...A-4 in the bilge!!
Not too many boats did that.
Hughes 38 is the only one I know of!??!!
Welcome!-Shawn
"Holiday" - '89 Alura 35 #109
"Twice Around" - '77 C-30, #511 with original A-4 & MMI manifold - SOLD! (no longer a two boat owner!!)
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What has helped me understanding cooling...and bypass valve..
Context. I considered myself a redshirt freshman last year owning my first A4 since August. Never did much mechanical, though always loved when I did. I am something like a A4 freshman this year.
The greatest help besides studying and reading threads here especially search on running with or without thermometer and all of the great debates on running colder or running hotter:
1) The Moyer publications.
2) Slow experimentation with infrared thermometer
3) Studying rebuild threads here and noting hot spot and water jacket references and Raw Water vs. Fresh Water Cooling.
My PO happened to post here under SMosher. That was one hell of a discovery.
In a way the bypass valve is simply a manual thermostat without any temperature sensitivity. It can augment your thermostats water blocking or flow function or it can be serve the block to manifold water directing function exclusively in the absence of a thermometer. The valve can provide some benefits when winterizing because you can force flow through the block and manifold, knowing that you have a well pickled engine. Good luck.Tim Smith
Oasis
Pearson 30
1974, Number 572
Boston, MA USA
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