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Old 05-14-2022, 12:42 PM   #1
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Turns out, I should have replaced this impeller sooner

Coolant temp shot up over 220 fairly suddenly the other day. I was able to bring it back down under 200 by throttling back, so I limped back to the marina (I hadn't got far).

This is about 3 years old, maybe 300 hours... I reckon I need to be looking at annual replacements. Time to start fishing for rubber chunks in my heat exchangers

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Old 05-14-2022, 01:00 PM   #2
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Did you check the exhaust hose?
I installed a new unused impeller which went that route within a month. Fortunately I had just also installed an exhaust house temp alarm which alerted me before the temp rose.
Well worth the money.
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Old 05-14-2022, 01:09 PM   #3
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I dunno, if chunks got as far as the exhaust hose, I'm not gonna worry about them. I just don't want them blocking the tubes in the HX's.

Yeah, There are several alarms that I would like to have installed. So far, I don't have any of them I just glance at the coolant temp gauge fairly frequently
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Old 05-14-2022, 01:10 PM   #4
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I put Borel Manufacturing exhaust temp alarm on our current and last boat. Very simple install and it will warn you of a loss of cooling water way before your engine temp gauge.
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Old 05-14-2022, 01:11 PM   #5
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I dunno, if chunks got as far as the exhaust hose, I'm not gonna worry about them. I just don't want them blocking the tubes in the HX's.

Yeah, There are several alarms that I would like to have installed. So far, I don't have any of them I just glance at the coolant temp gauge fairly frequently
No, he was referring to the hose melting due to the high temp of the exhaust when you loose cooling water flow. It can literally melt the exhaust hose. Check out Borel Mfg, great product. No affiliation.
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Old 05-14-2022, 01:24 PM   #6
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Sometimes a chewed up cam on the water pump will tear up an impeller like that.
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Old 05-14-2022, 02:35 PM   #7
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No, he was referring to the hose melting due to the high temp of the exhaust when you loose cooling water flow. It can literally melt the exhaust hose. Check out Borel Mfg, great product. No affiliation.
I had a cooling water hose fail. The exhaust hose survived the high temp just fine and is still in use more than 25 years later. What melted was the plastic muffler.
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Old 05-14-2022, 02:55 PM   #8
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I had a cooling water hose fail. The exhaust hose survived the high temp just fine and is still in use more than 25 years later. What melted was the plastic muffler.
Yes, that can melt also.
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Old 05-14-2022, 03:52 PM   #9
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I dunno, if chunks got as far as the exhaust hose, I'm not gonna worry about them. I just don't want them blocking the tubes in the HX's.

Yeah, There are several alarms that I would like to have installed. So far, I don't have any of them I just glance at the coolant temp gauge fairly frequently

so you don't understand how things work. That impeller sends water through the coolers and out the exhaust. Water keeps the exhaust from melting your exhaust hose. I made a simple suggestion to check your hose for damage having run dry for a time.
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Old 05-14-2022, 04:03 PM   #10
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I had an impeller really break up several yrs ago. I hadvvery goid luck usingca shop vac to get pieces out.
First vac from pump housing discharge... the disconnected outlet of Ht Xchr and blew back towards pump... vac from pump again. Repeated a couple times until nothing more came out.
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Old 05-14-2022, 07:45 PM   #11
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Here's the pile of impeller bits that I pulled out of the oil cooler. I think there's more than one generation of failed impeller here!
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Old 05-15-2022, 11:51 AM   #12
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Sometimes some of those pieces can go the other way and then after firing the engine they get suck into the new impeller, damaging it.. Take a good look up stream of the pump.
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Old 05-20-2022, 08:31 PM   #13
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Here's the pile of impeller bits that I pulled out of the oil cooler. I think there's more than one generation of failed impeller here!

That's a classic. I once had rookie first mate start the generator with the intake closed. The punishment was to collect all the bits to account for the full impeller, reassembling the puzzle.
And of course, really for my assurance that no impeller bits left behind!
Semper Fi!
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