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27 July 2022, 22:34
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#1
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Member
Country: UK - England
Boat name: Redneck
Make: Excel
Length: 3m +
Engine: 20 efi & 9.8 2s
Join Date: Jul 2020
Posts: 3,282
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Water pump damage.
Firstly, this isn't about my OB! Mine is running as good as ever.
If an OB is run with either a damaged impeller or run "dry" with no water for a short period of time ie: before overheat mode kicks in - what damage other than a knackered impeller and/or knackered pump can or is likely to happen?
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28 July 2022, 11:08
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#2
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Member
Country: UK - Wales
Town: Pembroke
Boat name: Rapscallion
Make: Humber Destroyer 6.0
Length: 5m +
Engine: E-TEC 150
Join Date: Jul 2006
Posts: 360
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Probably depends how the engine is running at the time.
If at idle and shut down quickly, damage likely limited to impeller, pump housing, bonding of housing liner to housing, local o-rings etc.
If under load / high rpm might be less lucky if overheat warning is missed or engine doesn't go into "self protect" mode, possible head gaskets and a host of other increasingly expensive problems right through to seizure and cracked heads / block.
Glad it's not yours [emoji846]
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28 July 2022, 11:23
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#3
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Member
Country: UK - England
Boat name: Redneck
Make: Excel
Length: 3m +
Engine: 20 efi & 9.8 2s
Join Date: Jul 2020
Posts: 3,282
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Thanks John, taking a look at a friends OB next weekend. He had a hole in his water bin when he was flushing out and didn't notice the water loss.
Fired it up, went to the loo, made a coffee, came back and noticed it wasn't peeing water and could smell burning plastic.
He shut it down straight away but us now sh1t scared to fire it up again.
I've advised not to even try, until "we" at least take a look at the impeller and pump housing.
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28 July 2022, 12:50
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#4
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Member
Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 70hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 4,607
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The impeller will be toast. At the very least get a new impeller, water pump liner and any gaskets. I'm sure it will be fine as it was probably started from cold if a few minutes. Longer than that who knows? Always worth keeping an eye on the engine when running it on land.
Harry Dwyer managed to set fire to his!
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28 July 2022, 16:09
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#5
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Member
Country: UK - Wales
Town: Pembroke
Boat name: Rapscallion
Make: Humber Destroyer 6.0
Length: 5m +
Engine: E-TEC 150
Join Date: Jul 2006
Posts: 360
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Quote:
Originally Posted by Steve509926
Thanks John, taking a look at a friends OB next weekend. He had a hole in his water bin when he was flushing out and didn't notice the water loss.
Fired it up, went to the loo, made a coffee, came back and noticed it wasn't peeing water and could smell burning plastic.
He shut it down straight away but us now sh1t scared to fire it up again.
I've advised not to even try, until "we" at least take a look at the impeller and pump housing.
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I assume your mate stopped the motor and it didn't sieze?
Definitely don't run it until you've rebuilt the waterpump as @spartacus says. Check the fit of the new liner into the pump housing which is likely plastic, as the housing may have melted / distorted - if in doubt replace it.
Assuming it didn't sieze, your mate has probably escaped any power head damage but to be sure check it is turning over freely and do a compression check.
If that all checks out, your mate got lucky. Give it a good long test run before using in anger - and buy a new wheely-bin [emoji1787]
And I'm with Spartacus - avoid if at all possible leaving engines on "flush" (especially on muffs) running unattended
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28 July 2022, 16:50
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#6
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Member
Country: UK - England
Boat name: Redneck
Make: Excel
Length: 3m +
Engine: 20 efi & 9.8 2s
Join Date: Jul 2020
Posts: 3,282
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I was astounded when he told me he left it running! Saying that, he is the type of person to leave his car running when he nips into the corner shop!
Thanks both for the advice, hopefully it will be OK. Any suggestions as to where to get the parts, 9.9 Merc 4 stroke 2006
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28 July 2022, 19:40
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#7
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Member
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Excel 435
Length: 4m +
Engine: Suzuki Outboard/25/4
Join Date: Oct 2011
Posts: 7,508
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If the impeller has broken up bits could be a pain to remove from the water ways
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28 July 2022, 21:24
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#8
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Member
Country: UK - England
Boat name: Redneck
Make: Excel
Length: 3m +
Engine: 20 efi & 9.8 2s
Join Date: Jul 2020
Posts: 3,282
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Quote:
Originally Posted by jeffstevens763@g
If the impeller has broken up bits could be a pain to remove from the water ways
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Is there anyway to backflush an OB to dislodge any bits that may be stuck?
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29 July 2022, 07:23
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#9
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Member
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Excel 435
Length: 4m +
Engine: Suzuki Outboard/25/4
Join Date: Oct 2011
Posts: 7,508
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If it’s worn slowly it will be ok if it’s torn up there might be some big bits lodged you can flush from the thermostat housing to a degree the tell tale will be a bugger if it’s got that far good luck
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08 October 2022, 12:51
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#10
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Member
Country: UK - England
Boat name: Redneck
Make: Excel
Length: 3m +
Engine: 20 efi & 9.8 2s
Join Date: Jul 2020
Posts: 3,282
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We finally had a chance this morning to take a look at, and replace the impeller and the housing. Good job we did as I don't think it would have lasted any longer.
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08 October 2022, 13:06
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#11
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Member
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 12,109
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Quote:
Originally Posted by Steve509926
We finally had a chance this morning to take a look at, and replace the impeller and the housing. Good job we did as I don't think it would have lasted any longer.
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I think the technical term for that is “f***ed”…
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08 October 2022, 13:13
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#12
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Member
Country: UK - England
Boat name: Redneck
Make: Excel
Length: 3m +
Engine: 20 efi & 9.8 2s
Join Date: Jul 2020
Posts: 3,282
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Quote:
Originally Posted by Pikey Dave
I think the technical term for that is “f***ed”…
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Yep, it was well and truly fragmented
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08 October 2022, 15:49
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#13
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Member
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Excel 435
Length: 4m +
Engine: Suzuki Outboard/25/4
Join Date: Oct 2011
Posts: 7,508
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Been run dry by the looks just read the first post da
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