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05-14-2022, 12:42 PM
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#1
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Member
City: Vonore
Join Date: Jul 2018
Posts: 16
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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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05-14-2022, 01:00 PM
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#2
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Guru
City: Gulf Islands, BC Canada
Vessel Name: Soo Valley
Vessel Model: Grand Banks 36
Join Date: Jul 2019
Posts: 2,821
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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.
__________________
SteveK AKA Soo Valley
You only need one working engine. That is why I have two.
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05-14-2022, 01:09 PM
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#3
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Member
City: Vonore
Join Date: Jul 2018
Posts: 16
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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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05-14-2022, 01:10 PM
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#4
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TF Site Team
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 15,821
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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.
__________________
Boat Nut:
If you are one there is no explanation necessary.
If you aren’t one, there is no explanation possible.
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05-14-2022, 01:11 PM
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#5
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TF Site Team
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 15,821
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Quote:
Originally Posted by although
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.
__________________
Boat Nut:
If you are one there is no explanation necessary.
If you aren’t one, there is no explanation possible.
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05-14-2022, 01:24 PM
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#6
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Guru
City: Cape May, NJ
Vessel Name: Irish Lady
Vessel Model: Monk 36
Join Date: Dec 2007
Posts: 4,451
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Sometimes a chewed up cam on the water pump will tear up an impeller like that.
__________________
Archie
Irish Lady
1984 Monk 36 Hull #46
Currently in Cape May, NJ
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05-14-2022, 02:35 PM
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#7
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TF Site Team
City: Saltspring Island
Vessel Name: Retreat
Vessel Model: C&L 44
Join Date: Nov 2007
Posts: 5,091
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Quote:
Originally Posted by Comodave
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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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.
__________________
Keith
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05-14-2022, 02:55 PM
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#8
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TF Site Team
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 15,821
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Quote:
Originally Posted by koliver
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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Yes, that can melt also.
__________________
Boat Nut:
If you are one there is no explanation necessary.
If you aren’t one, there is no explanation possible.
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05-14-2022, 03:52 PM
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#9
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Guru
City: Gulf Islands, BC Canada
Vessel Name: Soo Valley
Vessel Model: Grand Banks 36
Join Date: Jul 2019
Posts: 2,821
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Quote:
Originally Posted by although
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.
__________________
SteveK AKA Soo Valley
You only need one working engine. That is why I have two.
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05-14-2022, 04:03 PM
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#10
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TF Site Team
City: Seneca Lake NY
Vessel Name: Bacchus
Vessel Model: MS 34 HT Trawler
Join Date: Nov 2014
Posts: 6,472
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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.
__________________
Don
2008 MS 34 HT Trawler
"Bacchus"
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05-14-2022, 07:45 PM
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#11
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Member
City: Vonore
Join Date: Jul 2018
Posts: 16
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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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05-15-2022, 11:51 AM
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#12
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Guru
City: Gibsons, B.C., Canada
Vessel Name: Island Pride
Vessel Model: Palmer 32'
Join Date: Oct 2007
Posts: 3,903
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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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05-20-2022, 08:31 PM
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#13
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Newbie
City: Santa Barbara
Join Date: May 2020
Posts: 4
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Quote:
Originally Posted by although
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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