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21 March 2010, 22:40
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#1
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Member
Country: Ireland
Length: 5m +
Join Date: Nov 2006
Posts: 90
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changing impellor
I have a mariner engine for 2 years, should I change the impellor before I start using the boat for this season, there is a strong tell tale . The engine is 6 years old and I dont know when it was changed. Is this job for a mechanic or would I be able to do it myself?
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21 March 2010, 22:46
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#2
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RIBnet admin team
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 13,069
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Quote:
Originally Posted by davis
I have a mariner engine for 2 years, should I change the impellor before I start using the boat for this season, there is a strong tell tale . The engine is 6 years old and I dont know when it was changed. Is this job for a mechanic or would I be able to do it myself?
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Change it. It's not worth the risk of not doing it.
It's not difficult, but you'll need to buy the manual for your engine before you do it.
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21 March 2010, 22:52
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#3
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Member
Country: UK - Channel Islands
Town: jersey
Boat name: Martini II
Make: Arctic 28/FC470
Length: 8m +
Engine: twin 225Opti/50hp 2t
MMSI: 235067688
Join Date: Jun 2005
Posts: 3,030
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Leave it. It works so what's the point?
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21 March 2010, 23:22
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#4
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Member
Country: UK - England
Town: bedford
Make: tornado
Length: 5m +
Engine: outboard 60hp merc
Join Date: Oct 2007
Posts: 338
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If you don't know when it actually was changed after two years its vital that you change it, as if it fails it will cause your motor to overheat and seize, not good!
Best practice is to inspect every year and if ok then change it bi annually.
I change mine every year as by the time I have dropped the Lower leg off, for the £12 that a replacement costs I might as well do it.
It's a very straightforward task but I would advise that you get a manual or look on iboats.com for the DIY info.
One of the problems could be that its actually the original impellor and is in fact 6 years old.
If a vane breaks it can cause small bits to become jammed in the cooling passages of the block, another common cause of failure is that the centre bronze bush seperates from the rubber and hence doesn't pump. If it has been run at all without muffs or in water than it will have been stressed and could fail. Dropping the LU is also good practice as it prevents corrosion forming and sticking the two sections together.
Good Luck
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22 March 2010, 00:14
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#5
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Member
Country: Other
Town: Stanley, Falkland Is
Boat name: Seawolf
Make: Osprey Vipermax 5.8
Length: 5m +
Engine: Etec 150
Join Date: Mar 2006
Posts: 3,726
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An interesting discussion this one ... I have had my boat for 4 years and never touched the impeller and I think it may even still be original which would make it 10 years old. The local diver here told me a couple of years ago that his dive rib (1995 Humber with twins) had never been touched either.
I've got a spare impeller (two, in fact, one with the complete kit) but it's a round tuit job. Or rather it was ... I've now sold the boat so don't need to
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22 March 2010, 18:48
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#6
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Member
Country: UK - England
Town: yorkshire
Boat name: little vicky
Make: avon ex RNLI
Length: 3m +
Engine: tohatsu
Join Date: Mar 2008
Posts: 2,310
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i have known impellers last for many years too ,but another problem if you dont drop the lower unit every couple of years is that it can get seised on or the little woodruff key or peg that the impeller locates on can rust away if its steel .also its the upper and lower parts of the impeller that can wear out as much as the blades and the water pump lower plate ,i have bought impellers that have not been factory ones and they have lasted much longer than the dealer ones ,replaced some that would have gone on a lot longer ,,i even keep a spare impeller in the boat tool kit,
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22 March 2010, 21:49
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#7
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Member
Country: Other
Town: Principalite d'Chaos
Boat name: The Nashers Revenge!
Make: Windsor Brothers
Length: 6m +
Engine: Optimax 225
MMSI: "Mmmmm SI" she said!
Join Date: Jan 2004
Posts: 4,924
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For the amount of time it takes to drop the leg and change the impellor it's not worth taking the risk in my opinion. Even the cost is not a lot.
I do my DT200EFI every year, and can do the whole job in well under an hour.
I also believe Engines that are not used much should probably be changed more often as the impellor has more chance to set into position.
Plus as m chappelow says, it's a good chance to free off the woodruff key and clean the scale etc off the housing and plate.
The other thing dropping the leg does is ensure the drive shaft doesn't become stuck/corroded in the Crankshaft, cleaning the end of the shaft once a year and applying grease is good preventative maintenance.
Nasher.
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22 March 2010, 22:09
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#8
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Member
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,299
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Quote:
Originally Posted by Nasher
...clean the scale etc off the housing and plate.
... ensure the drive shaft doesn't become stuck/corroded in the Crankshaft
Nasher.
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Can't believe I'm hearing such things from a Soozook owner.
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23 March 2010, 16:47
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#9
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Member
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
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The other risk is that the rubber impeller gets brittle and starts falling apart, lodging rubber "plugs" somewhere up in the power head. It's happened to at least one person I know.
jky
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23 March 2010, 20:10
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#10
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Member
Country: UK - England
Town: High wycombe
Make: Zodiac
Length: 4m +
Engine: Mercury 40hp 4stroke
Join Date: Nov 2006
Posts: 65
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Impellor change
I just changed the impellor in my Mariner 50hp four stroke.
i was really worried about doing it as i had not done one before and was thinking of paying someone to do it, but finally attempted it myself and it turned out to be really straightforward.
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23 March 2010, 22:02
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#11
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Member
Country: Other
Town: Principalite d'Chaos
Boat name: The Nashers Revenge!
Make: Windsor Brothers
Length: 6m +
Engine: Optimax 225
MMSI: "Mmmmm SI" she said!
Join Date: Jan 2004
Posts: 4,924
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Quote:
Originally Posted by Dobieman
I just changed the impellor in my Mariner 50hp four stroke.
i was really worried about doing it as i had not done one before and was thinking of paying someone to do it, but finally attempted it myself and it turned out to be really straightforward.
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Good Man
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12 December 2010, 06:27
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#12
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Member
Country: Australia
Town: sydney
Boat name: perc
Make: quintrex
Length: 3m +
Engine: 15hp
Join Date: Dec 2010
Posts: 5
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when pulling a 15hp apart, to drop the box do you have to undo the 5 10mm bolts around the impeller housing and then undo the wedge shaped gear shift piece?
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18 December 2010, 20:27
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#13
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Member
Country: UK - N Ireland
Boat name: *
Make: replacement soon!
Length: no boat
Join Date: Jul 2010
Posts: 149
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water pump service
The link below my be of use to you and as I am just about to service my 2001 3 cyl 90 hp mariner 2 stroke; any signposting to a cheap but reliable supplier for the water pump service kit would be welcomed!!
Cheers
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