Reply
 
Thread Tools Search this Thread
 
Old 12 July 2015, 14:47   #11
RIBnet admin team
 
willk's Avatar
 
Country: Ireland
Make: Redbay Boats
Length: 9m +
Engine: 370hp
Join Date: Feb 2008
Posts: 12,928
RIBase
Quote:
Originally Posted by ShinyShoe View Post
No idea - but replacing an impellor that is old but intact, and replacing one that has disintegrated are two different tasks. The disintegrated one will have kindly filled all the nice little tubes around the cylinder head with bits of impellor that then impede water flow.
No, it will fill the raw seawater strainer basket with bits - assuming that the engine cooling circuit is closed (most serious kit is)
__________________

__________________
"Who knows what evil lurks in the hearts of men?"
.
willk is offline   Reply With Quote
Old 12 July 2015, 18:52   #12
ncp
Member
 
ncp's Avatar
 
Country: USA
Town: California
Make: Avon 5.4m Searider
Length: 5m +
Engine: Yamaha 90
Join Date: Aug 2011
Posts: 1,191
Quote:
Originally Posted by willk View Post
If so, the hose connection may have been for a water supply to allow the engine to be run while being davit launched, RNLI stylee...
Quote:
Originally Posted by zip View Post
Yep, ex military boat.
So I can run the boat out of the water with that hose outlet attached to a water source?
Yes, standard garden hose. I flush mine on the trailer in the driveway after every use. Just don't close the seacock, the raw water pump will suck the hose flat!


Quote:
Originally Posted by zip View Post
I have been told to replace a impellor on a Konrad 520 isn't that difficult.
There is no impeller in the Konrad 520 drive leg.

There is no transmission in the Konrad 520 drive leg.

This is what makes these drives so robust - nothing but the oversized gears in there.
__________________

__________________
ncp is offline   Reply With Quote
Old 12 July 2015, 20:38   #13
zip
Member
 
Country: USA
Town: Pacific Beach
Boat name: Dash II
Make: Willard
Length: 7m +
Engine: Cummins
Join Date: Aug 2007
Posts: 565
Tom, assuming the engine is running?

Where is the impeller?
__________________
zip is offline   Reply With Quote
Old 12 July 2015, 21:06   #14
ncp
Member
 
ncp's Avatar
 
Country: USA
Town: California
Make: Avon 5.4m Searider
Length: 5m +
Engine: Yamaha 90
Join Date: Aug 2011
Posts: 1,191
Quote:
Originally Posted by zip View Post
Tom, assuming the engine is running?

Where is the impeller?
On engine, gear driven.

On a Cummins, it can be any of three different pumps - M72, GC1, 1716 (listed smallest to largest). All have different inlet and outlet sizes and run different impellers.

At 180 or 210hp, you only need the smallest pump, the M72. The GC1 is meant for the 250/270hp rating while the 1716 is meant for the aftercooled 300hp and up engines. I currently have a rebuilt 1716 on my boat (largest of the pumps but that's what came with it) but have also run a GC1 (for a couple of months while the 1716 was getting rebuilt). I have a brand new (due to warranty issue) in my garage as a spare.

Raw water pump is on the port side under the fuel injection pump.
Attached Thumbnails
Click image for larger version

Name:	new gc1 plumbing.jpg
Views:	63
Size:	142.0 KB
ID:	106951  
__________________
ncp is offline   Reply With Quote
Old 13 July 2015, 05:25   #15
Member
 
Country: UK - Scotland
Town: north ayrshire
Boat name: charlie girl
Make: reiver 3.8/regal3760
Length: 10m +
Engine: 40hp 2st 2x6lp 315
Join Date: Jul 2009
Posts: 1,506
Quote:
Originally Posted by willk View Post
No, it will fill the raw seawater strainer basket with bits - assuming that the engine cooling circuit is closed (most serious kit is)
Seawater strainer is usually sited before pump to prevent debris entering pump
A disintegrated impeller usually warrants a cooler strip to remove the bits of impeller
__________________
beamishken is offline   Reply With Quote
Old 14 July 2015, 10:16   #16
zip
Member
 
Country: USA
Town: Pacific Beach
Boat name: Dash II
Make: Willard
Length: 7m +
Engine: Cummins
Join Date: Aug 2007
Posts: 565
Well alrighty then. I had no idea. If I ever get a boat, probably have more questions.
Thanks.
__________________
zip is offline   Reply With Quote
Old 21 July 2015, 12:41   #17
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 4,962
Quote:
Originally Posted by beamishken View Post
Seawater strainer is usually sited before pump to prevent debris entering pump
A disintegrated impeller usually warrants a cooler strip to remove the bits of impeller
Well it must depend on the motor then cos my Volvo has the strainer after the pump as willk has said. It's surprising what can get through the pump - I've even had a fish in the strainer!

To the op, I flush my inboard after each outing and then fill it with antifreeze mix to retard corrosion of the raw water system. I collect the antifreeze mix for reuse before launching. Obviously you can only do this if you trailer the boat or lift it out after use.
__________________
JW.
jwalker is offline   Reply With Quote
Old 21 July 2015, 13:22   #18
Member
 
Country: UK - Scotland
Town: north ayrshire
Boat name: charlie girl
Make: reiver 3.8/regal3760
Length: 10m +
Engine: 40hp 2st 2x6lp 315
Join Date: Jul 2009
Posts: 1,506
Quote:
Originally Posted by jwalker View Post
Well it must depend on the motor then cos my Volvo has the strainer after the pump as willk has said. It's surprising what can get through the pump - I've even had a fish in the strainer!

To the op, I flush my inboard after each outing and then fill it with antifreeze mix to retard corrosion of the raw water system. I collect the antifreeze mix for reuse before launching. Obviously you can only do this if you trailer the boat or lift it out after use.
Ah I see I've never owned a volvo powered boat but had several with mercruiser diesels & yanmar diesels & my pal's ford powered boat all have the strainer before the pump

You can inhibit with antifreeze in the water on a total loss basis if your worried about hard frost or corrosion we close the sea cocks & pour the antifreeze into the strainer & wait till you see the coloured water out of the exhaust
__________________

__________________
beamishken is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 14:07.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.