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11-16-2014, 10:47 PM
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#1
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Senior Member
City: Seattle
Vessel Name: Nordvind
Vessel Model: Nova Heritage 36
Join Date: Oct 2014
Posts: 123
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I messed up!
So I closed my intake valves to clean the sea strainers. Got distracted and started my engines without opening them up. They ran for a few minutes before I remembered! They were still cool when water started flowing again. Is there anything I'm likely to have damaged from this?
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Nordvind | 1987 36' Nova | Volvo TMD41A
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11-16-2014, 10:59 PM
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#2
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Guru
City: Hotel, CA
Join Date: Sep 2011
Posts: 8,323
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Water pump impeller is the most obvious thing to come to mind.
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Craig
It's easier to fool people than to convince them that they've been fooled - Mark Twain
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11-17-2014, 12:04 AM
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#3
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TF Site Team
City: Ex-Brisbane, (Australia), now Bribie Island, Qld
Vessel Name: Now boatless - sold 6/2018
Vessel Model: Had a Clipper (CHB) 34
Join Date: Jun 2008
Posts: 10,101
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I did that just once. Found no damage. Well put it another way, the impeller lasted for another 8 years, but yes, like Craig says, I'd check that. That's about all that's likely to have suffered, but there is usually enough wetness around them to run 'dry' for some time, minutes anyway, without failure.
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Pete
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11-17-2014, 06:51 AM
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#4
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Guru
Join Date: Oct 2007
Posts: 22,553
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Change out the impeller , keep it as a known to work spare , store it in a sealed bag with a dozen cover screws and a spare gasket.
Change it out dockside , and you should be able to do it underway , if you someday run in shallow or silty water.
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11-17-2014, 06:58 AM
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#5
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Guru
City: gulf coast
Join Date: Jun 2014
Posts: 3,440
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Engines are not harmed because they have closed cooling. Impeller is most likely victim if any. Even exhaust hoses are unlikely to have gotten hot at idle .
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11-17-2014, 11:26 AM
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#6
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Guru
Join Date: Apr 2009
Posts: 1,920
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Next oil change take a look see of the impellers. If they're not difficult to change just do it. If they are difficult to change - bet you won't forget next time.
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Tim
Tampa Bay
Carver 355 ACMY Twin Cummins Diesels Sold
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11-17-2014, 11:39 AM
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#7
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Guru
City: Cary, NC
Vessel Name: Skinny Dippin'
Vessel Model: Navigator 4200 Classic
Join Date: Jul 2009
Posts: 5,841
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If I had to guess, I would wager that most, if not ALL of us have done that once or twice. Last time I did it, I was backing out of the slip and noticed the exhaust note sounded more like a school bus than the glurbly note I was used to hearing. I think I even got the motor up to operating temp before I remembered. No harm done. Not even a new impellor was needed, but YMMV. Easy enough to take a peek to make sure.
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2000 Navigator 4200 Classic
(NOT a trawler)
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11-17-2014, 11:49 AM
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#8
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Senior Member
City: Seattle
Vessel Name: Nordvind
Vessel Model: Nova Heritage 36
Join Date: Oct 2014
Posts: 123
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Thank you all for your input! This forum is such a valuable resource for new guys like me! A little more detail...
After opening up the valves and letting the engines warm, Checking temps with my IR Thermometer to confirm values were where I expected them to be, we set out on a 5 hour run to Pousbo. Everything went well. However, when I started up the next day I had a warning light on my port engine. (engines were cold at this point) Looks like a thermometer with wavy water lines underneath. After taking on fuel, and restarting the engines the light appeared again momentarily and then went out. We motored just over idle for a hour just so that I could monitor things in the ER. Everything seemed to be working as expected.
But I think before we head out again, I'll open up the raw water impeller housing, probably replace for peace of mind as many of you have suggested.
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Nordvind | 1987 36' Nova | Volvo TMD41A
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11-17-2014, 12:07 PM
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#9
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TF Site Team
City: California Delta
Vessel Name: FlyWright
Vessel Model: 1977 Marshall Californian 34 LRC
Join Date: Apr 2008
Posts: 13,728
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Do you notice a difference in the water flow from your exhaust? It might have lost a blade or two and pumps insufficient water at idle, but just enough at higher power settings. Good idea to replace both impellers as it's peace of mind and cheap insurance.
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11-17-2014, 01:14 PM
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#10
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Senior Member
City: Seattle
Vessel Name: Nordvind
Vessel Model: Nova Heritage 36
Join Date: Oct 2014
Posts: 123
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No I have not noticed any change in water flow out the exhaust, but your explanation makes sense to me.
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Nordvind | 1987 36' Nova | Volvo TMD41A
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11-17-2014, 06:47 PM
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#11
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Hospitality Officer
City: Pittwater
Vessel Name: Sarawana
Vessel Model: IG 36 Quad Cabin
Join Date: Sep 2010
Posts: 1,897
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[QUOTE=Peter B;284418] I did that just once. Found no damage. Well put it another way, the impeller lasted for another 8 years,
Eight years Pete! Cripes I will buy you a new one for Christmas.
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11-18-2014, 04:51 AM
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#12
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TF Site Team
City: Ex-Brisbane, (Australia), now Bribie Island, Qld
Vessel Name: Now boatless - sold 6/2018
Vessel Model: Had a Clipper (CHB) 34
Join Date: Jun 2008
Posts: 10,101
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[QUOTE=Andy G;284637]
Quote:
Originally Posted by Peter B
I did that just once. Found no damage. Well put it another way, the impeller lasted for another 8 years,
Eight years Pete! Cripes I will buy you a new one for Christmas.
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Thanks for the offer Andy, but you're too late. It was replaced last December when she came out after 3 yrs - the anti foul and prop speed did great. The impeller was "a bit second hand looking" the guy said, yet it was still pumping out plenty of raw water from the exhaust, and she never ran above normal temp, so I coulda got another few years maybe..?
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Pete
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11-19-2014, 05:52 PM
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#13
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Senior Member
City: Seattle
Vessel Name: Nordvind
Vessel Model: Nova Heritage 36
Join Date: Oct 2014
Posts: 123
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Well I've never done this before so it's a little intimidating. But I shut the water intake and popped the cover off the water pump exposing the impeller. It looks fine to me, but I figure I may as well change it now since I have it open and will need to reseal anyway. I took the part number off the OEM part which doesn't seem to match anything out there on the interwebs. I called my local Volvo parts/service people (Coastal Marine Engine) and gave them my engine model number. They say the impeller kit is $69. That seems very high considering the price of other kits I've seen. But I don't know if there is a cross reference guide for non-oem parts say from Jabsco or Sherwood?
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Nordvind | 1987 36' Nova | Volvo TMD41A
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11-19-2014, 06:18 PM
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#14
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Guru
City: Sydney
Vessel Name: Sojourn
Vessel Model: Integrity 386
Join Date: Oct 2011
Posts: 13,329
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[QUOTE=Peter B;284727]
Quote:
Originally Posted by Andy G
...It was replaced last December when she came out after 3 yrs - the anti foul and prop speed did great. The impeller was "a bit second hand looking" the guy said, yet it was still pumping out plenty of raw water from the exhaust, and she never ran above normal temp, so I coulda got another few years maybe..?
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Peter,I hope you kept it as a spare just in case.
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BruceK
2005 Integrity 386 "Sojourn"
Sydney Australia
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11-19-2014, 06:30 PM
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#15
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Master and Commander
City: Vallejo CA
Vessel Name: Carquinez Coot
Vessel Model: penultimate Seahorse Marine Coot hull #6
Join Date: Sep 2010
Posts: 12,559
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Easy enough boo boo. I put a note or a tag at the helm if I've shut off the raw-water intake, and always, so far, listening for/observing the gurgling/splashing exhaust immediately after every engine start.
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Kar-KEEN-ez Koot
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11-19-2014, 06:32 PM
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#16
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Guru
City: Seattle, WA
Vessel Name: Pau Hana
Vessel Model: 1989 PT52 Overseas Yachtfisher
Join Date: Aug 2012
Posts: 2,676
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Quote:
Originally Posted by tegdesign
Well I've never done this before so it's a little intimidating. But I shut the water intake and popped the cover off the water pump exposing the impeller. It looks fine to me, but I figure I may as well change it now since I have it open and will need to reseal anyway. I took the part number off the OEM part which doesn't seem to match anything out there on the interwebs. I called my local Volvo parts/service people (Coastal Marine Engine) and gave them my engine model number. They say the impeller kit is $69. That seems very high considering the price of other kits I've seen. But I don't know if there is a cross reference guide for non-oem parts say from Jabsco or Sherwood?
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Eric, there's a very good chance that the pump is a Sherwood. Is there a number on the pump or the impeller? Photos?
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Peter- Marine Insurance Guru at Novamar Insurance Group (206-350-5051) & tuna fishing addict!
1989 52' PT Overseas yachtfisher
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11-19-2014, 06:38 PM
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#17
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Senior Member
City: Seattle
Vessel Name: Nordvind
Vessel Model: Nova Heritage 36
Join Date: Oct 2014
Posts: 123
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I have photos...don't understand the forums http: photo upload. The photos I have are not on a website.
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Nordvind | 1987 36' Nova | Volvo TMD41A
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11-19-2014, 06:44 PM
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#18
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Guru
City: Seattle, WA
Vessel Name: Pau Hana
Vessel Model: 1989 PT52 Overseas Yachtfisher
Join Date: Aug 2012
Posts: 2,676
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No worries. I looked at your survey and got some info.
I did find this:
Water Pump Kit - Sierra
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Peter- Marine Insurance Guru at Novamar Insurance Group (206-350-5051) & tuna fishing addict!
1989 52' PT Overseas yachtfisher
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11-19-2014, 06:53 PM
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#19
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Senior Member
City: Seattle
Vessel Name: Nordvind
Vessel Model: Nova Heritage 36
Join Date: Oct 2014
Posts: 123
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Pau Hana, Thank you for the link. As always, impressive the depth of knowledge on this forum. But...what did you mean, looked at my survey? Is this Peter, as in, Peter my insurance guy??
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Nordvind | 1987 36' Nova | Volvo TMD41A
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11-19-2014, 06:56 PM
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#20
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Guru
City: Seattle, WA
Vessel Name: Pau Hana
Vessel Model: 1989 PT52 Overseas Yachtfisher
Join Date: Aug 2012
Posts: 2,676
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Yessir- I be he.
(or, I'm a professional stalker.... )
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Peter- Marine Insurance Guru at Novamar Insurance Group (206-350-5051) & tuna fishing addict!
1989 52' PT Overseas yachtfisher
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