Outboard - Change Water pump or just impeller - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
  #1  
Old 04-11-2008
Finallybuyingaboat's Avatar
Senior Member
 
Join Date: Aug 2007
Posts: 156
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
Finallybuyingaboat is on a distinguished road
Outboard - Change Water pump or just impeller

This will be the first of 100s of questions I will have over the coming weeks as I slowly start to re-assemble my first sailboat that I slowly disassembled last fall!

Anyway, I need to buy an outboard, and a friend has an 8 hp Evinrude Yachtwin from 1989. However, when running, it does not pump very much water according to him. Would I need to replace the whole water pump or just the impeller? Not holding anyone to anything, but would it be worthwhile to try and just change the impeller before I change the whole pump?

My buddy isn't mechanically inclined,so he is of little help. How hard can this be? A few hours work if I have the manual?
Reply With Quote Share with Facebook
  #2  
Old 04-11-2008
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 9 Times in 9 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
Replace the impeller... however, if the impeller is missing vanes...they're probably in the cooling system and will need to be flushed out.
__________________
Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
Reply With Quote Share with Facebook
  #3  
Old 04-11-2008
Junior Member
 
Join Date: May 2007
Location: San Diego
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
kelt348 is on a distinguished road
Send a message via AIM to kelt348
If its still pumping water you should be fine with just replacing the impeller. If you have any questions about it, you have to take the water pump apart to change the impeller so it might just be worth throwing in a whole new assembly. Its not all that hard to do, just take your time and dont force anything. you should replace the gear oil as well
Reply With Quote Share with Facebook
  #4  
Old 04-11-2008
petegingras's Avatar
Senior Member
 
Join Date: Mar 2007
Location: Rouge Island
Posts: 139
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
petegingras is on a distinguished road
just did replace my impeller, 3.3 hp Mercury, gonna need a gasket too. I have failed in my rebuild, as i can't get the gear arm to correctly attach to the transmission arm. The manuel said, "dealer recommended". I see why, i will continue the rebuild.
__________________
s/v Libertine
Hunter 44DS
Reply With Quote Share with Facebook
  #5  
Old 04-13-2008
Classic30's Avatar
Once known as Hartley18
 
Join Date: Aug 2007
Location: Melbourne, Australia
Posts: 4,471
Thanks: 26
Thanked 42 Times in 42 Posts
Rep Power: 8
Classic30 will become famous soon enough Classic30 will become famous soon enough
With an outboard of that vintage, not pumping much water can mean a few things, and could even be as simple as a blockage in the tell-tale.

If it were me, I'd take it to an outboard mechanic for a service and test run. Just for peace of mind when you're a few miles out with no wind to get you home again..
__________________
-
"Honestly, I don't know why seamen persist in getting wrecked in some of the outlandish places they do, when they can do it in a nice place like Fiji." -- John Caldwell, "Desperate Voyage"
Reply With Quote Share with Facebook
  #6  
Old 04-13-2008
DrB DrB is offline
Senior Member
 
Join Date: Mar 2007
Location: New England
Posts: 966
Thanks: 0
Thanked 6 Times in 6 Posts
Rep Power: 8
DrB will become famous soon enough
Impeller then Pump

My approach is to try the easiest thing first, than work my way up the complicated ladder UNLESS I know it's the complicated thing.

Water being expelled out of the back of the motor means at least the pump is running. The impeller could be shot or as Harley18 says, it could be a bunch off things.

If it is pretty easy to pull and look at the impeller, do that first. If that checks out, and you have a nearby Evenrude Mechanic, lug it over there and see if they can give a quickly look and do a diagnosis.

Another idea is that the engine is fine and the amount of water coming out of the back is normal. Your friend may be saying that the water amount is low, when in reality it is not. The mechanic would know for sure.

DrB
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Perkins Raw water pump ranes Gear & Maintenance 2 04-01-2008 07:59 PM
Water Pump Yanmar 2GM20F puff6022 Gear & Maintenance 13 02-27-2008 09:16 AM
2GM20F - Fresh Water Circulating pump Bill R Island Packet 5 09-17-2007 12:53 PM


All times are GMT -4. The time now is 12:27 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.