Postby Phrancus » June 1st, 2021, 4:09 pm
Sunshine is here and on with the work: took the heat exchanger off the port engine to make sure that is or is not the cause of all overheating evil.
Old engine, dirty and rusty here and there so tread firmly yet carefully. Took it off, took it home to descale and thought it looked a bit funny.
And indeed, another curious solution by a mechanic some time ago: The did not extract the 'organ' (lots of small pipes that exchange the heat with the surrounding coolant) but CHOSE TO SAW OFF THE END! And had a lot of work to close it up again.
And of course, I had to open it up to be sure of its status. Could not let it be and then after a lot of work and searching all parts of the circuit for trouble only to discover that this was deliberately overlooked.
So spent two hours trying to put it back together watertight and almost succeeded. It drips, so I must go to the last resort and caulk a bit of flexible rubber to seal it off.
The exchanger was clean mostly, just a bit on the bottom. No anode by the way, all gone. And the new replacement was the wrong type plus the plug is rock solid in it's hole. So once I get the new anode I'll have to open that side again. No big deal, I know the route now and can do it on the engine. That lid was, however, mounted a bit out of line, misplacing the gasket that divides the flow back and forth so this may have been part of the problem: it could not perform up to spec. This also caused a bit of a short curve in a rubber connection to a pipe. Also not a full failure point but also nog helpful for a smooth flow of seawater from exchanger into the exhaust.
Replaced the gasket to the turbo (3 holes: fumes and coolant in+out, one of those rubber insets was crooked: leakage) another non-helpful situation as coolant level may have been lower than it should be. Even though I check at the expansion tank before departure.
tomorrow I check the sea water hoses that are located under the heat exchanger as I have access now. In another pipe I found some remnants of an impeller blocking the impeller pump sporadically. Perhaps something travelled on and as I can access it now anyway, I'll beter open it all up to be sure. Can't really remove the oil cooler right away, too big mess and time consuimng. It will have to wait till winter.
So much for the update for now. Hope to share more positive news soon.
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