Page 1 of 3
1
23
>
Search this Thread
08 August , 20:20
#
1
smallribber
Member
Country:
UK - England
Town:
Colchester
Length:
5m +
Join Date:
Sep
Posts:
3,124
That old Change your impeller every year debate
I Charged the battery and it started after about 4 attempts. Petrol in tank very old.
It seems to run ok and pumps water like a trojan .
https://www.youtube.com/watch?v=sqck0FSX2wQ
Makes you think !
Got my Brothers boat ready for him to go boating in. He does nothing to it and I don't think he has started it in over a year. He/We have owned the boat over 6 years and it has never had a new impeller. Not sure how long the one in it had been in before we bought the boat.I Charged the battery and it started after about 4 attempts. Petrol in tank very old.It seems to run ok and pumps water like a trojan .Makes you think !
__________________
08 August , 21:03
#
2
The Gurnard
Member
Country:
UK - Scotland
Town:
Stirling
Boat name:
The Gurnard
Make:
Quicksilver
Length:
4m +
Engine:
mariner 25hp 2s
Join Date:
Jul
Posts:
1,671
Example my 6HP Yamaha Four stroke averages around 200 hours per year. I check the impeller every winter and decided to change it after three years of use..approx 600 hours of running. It was still in reasonable conditions but the ends of the blades were wearing flat and it was starting to loose its spring feeling when I bent them..if that makes sense.
So yes..you are correct they could be fine..but if it was my OB ..I would at least check their condition. Simply because if they fail at sea..(and you have no idea what shape they are in ?) ..they could cause a loss of life. If not yours or your brothers ..someone elses if the RNLI are attending to your problem and someone else gets into serious trouble. Admittedly .. very unlikely .. but not something I could live with if it happened to me .. simply because I ignored checking a vital part of the engine that does wear out.
Does my reply make you think ?
PS..I don't replace my plugs every year either..I keep them going until I think they are done..but I check them regular too ..and carry a spare set on the boat
I am no expert Big Plumbs but would imagine the impeller is like everything..if you dont use the boat much..it will last for years. I do my own servicing and check my impellers every winter but only replace them when I think they require replacing.Example my 6HP Yamaha Four stroke averages around 200 hours per year. I check the impeller every winter and decided to change it after three years of use..approx 600 hours of running. It was still in reasonable conditions but the ends of the blades were wearing flat and it was starting to loose its spring feeling when I bent them..if that makes sense.So yes..you are correct they could be fine..but if it was my OB ..I would at least check their condition. Simply because if they fail at sea..(and you have no idea what shape they are in ?) ..they could cause a loss of life. If not yours or your brothers ..someone elses if the RNLI are attending to your problem and someone else gets into serious trouble. Admittedly .. very unlikely .. but not something I could live with if it happened to me .. simply because I ignored checking a vital part of the engine that does wear out.Does my reply make you think ?PS..I don't replace my plugs every year either..I keep them going until I think they are done..but I check them regular too ..and carry a spare set on the boat
__________________
08 August , 21:14
#
3
gpsguru
Member
Country:
UK - England
Boat name:
Bluefin
Make:
Ribcraft
Length:
5m +
Engine:
150hp
MMSI:
Ex Directory
Join Date:
Oct
Posts:
347
Quote:
Bigplumbs
Originally Posted by
Makes you think !
Certainly, modern merc 4 strokes are impellor change every 3 years or every 300 hours and TBH I have never changed an impeller as part of an annual service, but I do inspect it every year ............
At 6 years you really need to have a good inspection for the rubber cracking at the root of the vanes ...........
Certainly, modern merc 4 strokes are impellor change every 3 years or every 300 hours and TBH I have never changed an impeller as part of an annual service, but I do inspect it every year ............At 6 years you really need to have a good inspection for the rubber cracking at the root of the vanes ...........
__________________
08 August , 21:42
#
4
ShinyShoe
Member
Country:
UK - England
Length:
3m +
Join Date:
Sep
Posts:
2,767
Quote:
Bigplumbs
Originally Posted by
It seems to run ok and pumps water like a trojan .
Makes you think !
- why would someone think it would have failed in storage.
- how long will it be till a vein tears off and stops pumping properly.
- when a vein tears off will little bits of the rubber break off and block up the water channels
- if it was as simple as failing when testing in a tank rather than underway then people wouldn't replace routinely
I'm thinking:- why would someone think it would have failed in storage.- how long will it be till a vein tears off and stops pumping properly.- when a vein tears off will little bits of the rubber break off and block up the water channels- if it was as simple as failing when testing in a tank rather than underway then people wouldn't replace routinely
__________________
08 August , 22:31
#
5
smallribber
Member
Country:
UK - England
Town:
Colchester
Length:
5m +
Join Date:
Sep
Posts:
3,124
Quote:
ShinyShoe
Originally Posted by
I'm thinking:
- why would someone think it would have failed in storage. They think the Rubber holds its bent position
- how long will it be till a vein tears off and stops pumping properly. Who Knows
- when a vein tears off will little bits of the rubber break off and block up the water channels Could do like all the other rubbish that is sucked into the raw water intake
- if it was as simple as failing when testing in a tank rather than underway then people wouldn't replace routinely Many don't replace routinely
Answers below in red
__________________
08 August , 22:33
#
6
smallribber
Member
Country:
UK - England
Town:
Colchester
Length:
5m +
Join Date:
Sep
Posts:
3,124
Quote:
The Gurnard
Originally Posted by
Example my 6HP Yamaha Four stroke averages around 200 hours per year. I check the impeller every winter and decided to change it after three years of use..approx 600 hours of running. It was still in reasonable conditions but the ends of the blades were wearing flat and it was starting to loose its spring feeling when I bent them..if that makes sense.
So yes..you are correct they could be fine..but if it was my OB ..I would at least check their condition. Simply because if they fail at sea..(and you have no idea what shape they are in ?) ..they could cause a loss of life. If not yours or your brothers ..someone elses if the RNLI are attending to your problem and someone else gets into serious trouble. Admittedly .. very unlikely .. but not something I could live with if it happened to me .. simply because I ignored checking a vital part of the engine that does wear out.
Does my reply make you think ?
PS..I don't replace my plugs every year either..I keep them going until I think they are done..but I check them regular too ..and carry a spare set on the boat
I am no expert Big Plumbs but would imagine the impeller is like everything..if you dont use the boat much..it will last for years. I do my own servicing and check my impellers every winter but only replace them when I think they require replacing.Example my 6HP Yamaha Four stroke averages around 200 hours per year. I check the impeller every winter and decided to change it after three years of use..approx 600 hours of running. It was still in reasonable conditions but the ends of the blades were wearing flat and it was starting to loose its spring feeling when I bent them..if that makes sense.So yes..you are correct they could be fine..but if it was my OB ..I would at least check their condition. Simply because if they fail at sea..(and you have no idea what shape they are in ?) ..they could cause a loss of life. If not yours or your brothers ..someone elses if the RNLI are attending to your problem and someone else gets into serious trouble. Admittedly .. very unlikely .. but not something I could live with if it happened to me .. simply because I ignored checking a vital part of the engine that does wear out.Does my reply make you think ?PS..I don't replace my plugs every year either..I keep them going until I think they are done..but I check them regular too ..and carry a spare set on the boat
Very wise words. I wonder however about the old adage if it ain't broke don't fix it
Or as I have herd it...... if it ain't broke don't break it
Very wise words. I wonder however about the old adage if it ain't broke don't fix itOr as I have herd it...... if it ain't broke don't break it
__________________
08 August , 23:06
#
7
ShinyShoe
Member
Country:
UK - England
Length:
3m +
Join Date:
Sep
Posts:
2,767
Quote:
Bigplumbs
Originally Posted by
Very wise words. I wonder however about the old adage if it ain't broke don't fix it
Or as I have herd it...... if it ain't broke don't break it
What about timing belts?
Do you change oil in your car?What about timing belts?
__________________
08 August , 23:09
#
8
Fenlander
RIBnet admin team
Country:
UK - England
Town:
Cambridgeshire
Boat name:
Nimrod II
Make:
Aerotec 380
Length:
3m +
Engine:
Yam 15 Tohatsu 9.8
Join Date:
Nov
Posts:
8,994
I'm always a bit nervous with any used new to me outboard re the impeller condition even if it pumps OK so as part of getting the outboard to a known position I'll change it using a genuine OE one. With the Yamaha 15 2-stroke I bought this year I put in the full kit with upper pump housing liner and lower plate so it starts off as new.
Now I've done this, with our low leisure use hours compared to Gurnard, I'll probably only drop the lower unit 2 yearly and replace the impeller then whatever the condition. For me it's not worth the trouble of just inspecting at such an interval but then leaving the old one in.
__________________
09 August , 00:13
#
9
Poly
RIBnet admin team
Country:
UK - Scotland
Boat name:
imposter
Make:
FunYak
Length:
3m +
Engine:
Tohatsu 30HP
MMSI:
Join Date:
Sep
Posts:
11,632
Quote:
gpsguru
Originally Posted by
At 6 years you really need to have a good inspection for the rubber cracking at the root of the vanes ...........
If those leg bolts have been sitting for over 6 years I&#;d be keen to check they will actually move when needed.
BP presumably your inlet has a &#;grill&#; on it to filter out the big bits that won&#;t make it through the passages. There is no guarantee the bits that break off will be small enough to cause you no problem.
FWIW - I don&#;t religiously change impellers annually. I actually think many people don&#;t. But with an engine of that age having been sitting doing nothing for a long time - I wonder why you would take the risk.
If those leg bolts have been sitting for over 6 years I&#;d be keen to check they will actually move when needed.BP presumably your inlet has a &#;grill&#; on it to filter out the big bits that won&#;t make it through the passages. There is no guarantee the bits that break off will be small enough to cause you no problem.FWIW - I don&#;t religiously change impellers annually. I actually think many people don&#;t. But with an engine of that age having been sitting doing nothing for a long time - I wonder why you would take the risk.
__________________
09 August , 06:17
#
10
smallribber
Member
Country:
UK - England
Town:
Colchester
Length:
5m +
Join Date:
Sep
Posts:
3,124
Quote:
Poly
Originally Posted by
If those leg bolts have been sitting for over 6 years I&#;d be keen to check they will actually move when needed.
BP presumably your inlet has a &#;grill&#; on it to filter out the big bits that won&#;t make it through the passages. There is no guarantee the bits that break off will be small enough to cause you no problem.
FWIW - I don&#;t religiously change impellers annually. I actually think many people don&#;t. But with an engine of that age having been sitting doing nothing for a long time - I wonder why you would take the risk.
Why would you do something that does not need doing why would you take the risk of messing something up when you pull it to pieces. Always a risk
There is theory and then their is facts and the evidence you see
If you have 10 boats + to look after and 12 engines you tend to only do what is necessary
Because it is pumping water very well and changing it is unnecessary.Why would you do something that does not need doing why would you take the risk of messing something up when you pull it to pieces. Always a riskThere is theory and then their is facts and the evidence you seeIf you have 10 boats + to look after and 12 engines you tend to only do what is necessary
__________________
09 August , 06:47
#
11
Bushrider
Member
Country:
Germany
Town:
StPetersburg Russia
Boat name:
Ocean Devil
Make:
Scorpion 8.6m
Length:
8m +
Engine:
Yanmar 315hp
zen contains other products and information you need, so please check it out.
MMSI:
Join Date:
Aug
Posts:
646
RIBase
I installed on all my outboards water pressure gauges .
Gave me during the year additional piece of mind .
__________________
soon Evinrude ETEC G2 150H.O.
09 August , 07:08
#
12
smallribber
Member
Country:
UK - England
Town:
Colchester
Length:
5m +
Join Date:
Sep
Posts:
3,124
Quote:
Bushrider
Originally Posted by
I installed on all my outboards water pressure gauges .
Gave me during the year additional piece of mind .
Now that is interesting where do you install those.... Any pictures
__________________
09 August , 08:57
#
13
Fenlander
RIBnet admin team
Country:
UK - England
Town:
Cambridgeshire
Boat name:
Nimrod II
Make:
Aerotec 380
Length:
3m +
Engine:
Yam 15 Tohatsu 9.8
Join Date:
Nov
Posts:
8,994
>>>If those leg bolts have been sitting for over 6 years I&#;d be keen to check they will actually move when needed.
Yep that's the worry I'd consider BP... getting the lower unit off if it's been in place several years. Two problems... the lower unit bolts Poly mentions are inclined to snap off which is a whole world of pain and even worse the driveshaft splines can seize in the powerhead causing folks to employ all sorts of inventive but risky methods such as suspending the outboard upside down by the lower unit and hammering down on the underside of the power head.
This master bodger hammer jockey shows just how stuck they can get...
https://www.youtube.com/watch?v=-ka2A3RdGZ0
>>>Why would you do something that does not need doing why would you take the risk of messing something up when you pull it to pieces.>>>If those leg bolts have been sitting for over 6 years I&#;d be keen to check they will actually move when needed.Yep that's the worry I'd consider BP... getting the lower unit off if it's been in place several years. Two problems... the lower unit bolts Poly mentions are inclined to snap off which is a whole world of pain and even worse the driveshaft splines can seize in the powerhead causing folks to employ all sorts of inventive but risky methods such as suspending the outboard upside down by the lower unit and hammering down on the underside of the power head.This master bodger hammer jockey shows just how stuck they can get...
__________________
09 August , 09:31
#
14
Fender
Member
Country:
UK - England
Make:
Zodiac
Length:
under 3m
Engine:
Scull
Join Date:
Dec
Posts:
531
Quote:
Bigplumbs
Originally Posted by
Because it is pumping water very well and changing it is unnecessary.
Why would you do something that does not need doing why would you take the risk of messing something up when you pull it to pieces. Always a risk
There is theory and then their is facts and the evidence you see
If you have 10 boats + to look after and 12 engines you tend to only do what is necessary
The engine manufactures schedule for impeller replacement is where I'd start and personally I always err on the side of caution
__________________
09 August , 09:58
#
15
smallribber
Member
Country:
UK - England
Town:
Colchester
Length:
5m +
Join Date:
Sep
Posts:
3,124
Quote:
Fender
Originally Posted by
The engine manufactures schedule for impeller replacement is where I'd start and personally I always err on the side of caution
So ignoring reality and following that old Myth then.
__________________
09 August , 10:16
#
16
GuyC
Member
Country:
UK - England
Town:
Waterlooville
Boat name:
Tickler
Make:
Halmatic P22
Length:
6m +
Engine:
Inboard Diesel 240HP
MMSI:
Join Date:
Sep
Posts:
1,777
RIBase
Fender - don't rise to it.
__________________
09 August , 10:31
#
17
Fender
Member
Country:
UK - England
Make:
Zodiac
Length:
under 3m
Engine:
Scull
Join Date:
Dec
Posts:
531
Quote:
GuyC
Originally Posted by
Fender - don't rise to it.
Whatever people choose to do on the water is ultimately their prerogative, whether or not its the right thing is another matter
lol, I've said my pieceWhatever people choose to do on the water is ultimately their prerogative, whether or not its the right thing is another matter
__________________
09 August , 10:39
#
18
Dan Gurney
Member
Country:
UK - Scotland
Town:
Acharacle
Boat name:
Iolar
Make:
Redbay
Length:
6m +
Engine:
Suzuki DF175
Join Date:
Sep
Posts:
1,047
Quote:
Bigplumbs
Originally Posted by
So ignoring reality and following that old Myth then.
To be honest I think the original premis of this post has value... particularly with reference to the 'old fuel' debate. Though even on that topic I'm not sure that the fact it runs in a bucket means that it will run well under load; personally I'd top it up with as much fresh as I could.
On the subject of preemptive maintenance, I would like to add my voice to the 'pro' side. The idea that you would just wait for something as crucial as an impeller to fail and not even check it is borderline irresponsible. And once you've got to the stage of checking it then for the relatively low cost of the part then you may as well replace it.
To be honest I find much of what the OP posts on rib.net to be inexplicable, inconsistent, and often wilfully contrarian. For someone with such a self-professed breadth and depth of knowledge on all types of motors, from remote control aircraft to ion drives and beyond, to have such a cavalier attitude to maintenance doesnt seem to me to quite ring true. But that is merely an opinion. He evidently takes great delight in proving people/manufacturers 'wrong' and exploding the 'myth' of duty lifecycles for engine parts; and if you share that passion the fill your boots. Just try not to stray too far from shore cos someone else will have to come and get you.
What myth is that? The myth of preemptive maintenance?To be honest I think the original premis of this post has value... particularly with reference to the 'old fuel' debate. Though even on that topic I'm not sure that the fact it runs in a bucket means that it will run well under load; personally I'd top it up with as much fresh as I could.On the subject of preemptive maintenance, I would like to add my voice to the 'pro' side. The idea that you would just wait for something as crucial as an impeller to fail and not even check it is borderline irresponsible. And once you've got to the stage of checking it then for the relatively low cost of the part then you may as well replace it.To be honest I find much of what the OP posts on rib.net to be inexplicable, inconsistent, and often wilfully contrarian. For someone with such a self-professed breadth and depth of knowledge on all types of motors, from remote control aircraft to ion drives and beyond, to have such a cavalier attitude to maintenance doesnt seem to me to quite ring true. But that is merely an opinion. He evidently takes great delight in proving people/manufacturers 'wrong' and exploding the 'myth' of duty lifecycles for engine parts; and if you share that passion the fill your boots. Just try not to stray too far from shore cos someone else will have to come and get you.
__________________
09 August , 10:44
#
19
Dan Gurney
Member
Country:
UK - Scotland
Town:
Acharacle
Boat name:
Iolar
Make:
Redbay
Length:
6m +
Engine:
Suzuki DF175
Join Date:
Sep
Posts:
1,047
Quote:
Fender
Originally Posted by
Whatever people choose to do on the water is ultimately their prerogative, whether or not its the right thing is another matter
lol, I've said my pieceWhatever people choose to do on the water is ultimately their prerogative, whether or not its the right thing is another matter
Which is why I think it's important for other people to said their piece on these threads. Many folk new to boating use these boards as a reference (I did/do) so I think it's useful to highlight the fact that Mr Plumbs doesn't necessarily represent 'the orthodoxy' in all matters.
__________________
09 August , 11:59
#
20
beamishken
Member
Country:
UK - Scotland
Town:
north ayrshire
Boat name:
charlie girl
Make:
S/R5.4/regal
Length:
10m +
Engine:
Suzukidf70 2x6lp 315
Join Date:
Jul
Posts:
4,027
Quote:
Bigplumbs
Originally Posted by
Because it is pumping water very well and changing it is unnecessary.
How do you know it isnt necessary it could be ready to disintegrate any time?
Why would you do something that does not need doing why would you take the risk of messing something up when you pull it to pieces. Always a risk
If your that unsure of your abilities perhaps you should trust the work to someone more competent! Stripping the lower unit off regularly prevents it from siezing on and ensures you can fix it when you need to
There is theory and then their is facts and the evidence you see
If you have 10 boats + to look after and 12 engines you tend to only do what is necessary
Perhaps you should thin down your fleet so you can properly maintan what you have
__________________
Page 1 of 3
1
23
>
«
Mercury 40 Fuel Connector
| Top |
Old mariner 15 2 stroke tell tail
»
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
OnBB code isOnSmilies areOn[IMG] code isHTML code is Off
OffTrackbacks areOffPingbacks areOffRefbacks are
Forum Rules
For more information, please visit oem pump impeller.
Comments
Please Join Us to post.
0