Reply
 
Thread Tools Search this Thread
 
Old 12 July 2015, 12:58   #1
zip
Member
 
Country: USA
Town: Pacific Beach
Boat name: Dash II
Make: Willard
Length: 7m +
Engine: Cummins
Join Date: Aug 2007
Posts: 565
Do you flush your diesel engine after use?

On the recent survey and attempted sea trail of a boat I have an interest in, I noticed a hose nozzle on top of the engine.
Is this used to flush engine after use, or just used for service?
__________________

__________________
zip is offline   Reply With Quote
Old 12 July 2015, 13:29   #2
Member
 
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,841
Quote:
Originally Posted by zip View Post
On the recent survey and attempted sea trail of a boat I have an interest in, I noticed a hose nozzle on top of the engine.
Is this used to flush engine after use, or just used for service?
Dunno about the specific engine in question, but the deciding factor is 'closed circuit' or 'raw water' cooled.

If 'closed circuit', which I'd guess that most inboard diesels are now, flushing after every use is not necessary. If raw water cooled, it would be desirable, but not catastrophic if it didn't happen.

Us leisure users can become overly concerned with flushing, washing, winterizing, fretting etc.
__________________

__________________
Mollers is offline   Reply With Quote
Old 12 July 2015, 13:46   #3
RIBnet admin team
 
willk's Avatar
 
Country: Ireland
Make: Redbay Boats
Length: 9m +
Engine: 370hp
Join Date: Feb 2008
Posts: 12,924
RIBase
Quote:
Originally Posted by zip View Post
On the recent survey and attempted sea trail of a boat I have an interest in, I noticed a hose nozzle on top of the engine.
Is this used to flush engine after use, or just used for service?
I'm gonna take a wild guess on this one: Was that a US Navy RIB?

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...
__________________
"Who knows what evil lurks in the hearts of men?"
.
willk is offline   Reply With Quote
Old 12 July 2015, 14:01   #4
Member
 
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,841
Quote:
Originally Posted by willk View Post
I'm gonna take a wild guess on this one: Was that a US Navy RIB?

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...
Good call. Run 'em up and bung 'em in.
__________________
Mollers is offline   Reply With Quote
Old 12 July 2015, 14:05   #5
zip
Member
 
Country: USA
Town: Pacific Beach
Boat name: Dash II
Make: Willard
Length: 7m +
Engine: Cummins
Join Date: Aug 2007
Posts: 565
Yep, ex military boat.
So I can run the boat out of the water with that hose outlet attached to a water source?
__________________
zip is offline   Reply With Quote
Old 12 July 2015, 14:15   #6
Member
 
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,841
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?
It may pay to have it confirmed before you flash her up out of water. It doesn't take too many seconds to cook an impellor if run dry.
__________________
Mollers is offline   Reply With Quote
Old 12 July 2015, 14:21   #7
zip
Member
 
Country: USA
Town: Pacific Beach
Boat name: Dash II
Make: Willard
Length: 7m +
Engine: Cummins
Join Date: Aug 2007
Posts: 565
ok. good info.

I have been told to replace a impellor on a Konrad 520 isn't that difficult.
I understand that difficulty is a relative term depending on someone's knowledge, abilities and other factors, but is it necessary to remove the whole lower end?
__________________
zip is offline   Reply With Quote
Old 12 July 2015, 14:24   #8
Member
 
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,841
Quote:
Originally Posted by zip View Post
ok. good info.

I have been told to replace a impellor on a Konrad 520 isn't that difficult.
I understand that difficulty is a relative term depending on someone's knowledge, abilities and other factors, but is it necessary to remove the whole lower end?
We're not familiar with Konrad outdrives over here, but I'd imagine that the principle is the same as any other leg.
Yeah, you need to drop the gearbox and the impellor housing will be sat at the bottom of the driveshaft on the top of the box. The only tricky bit can be disconnecting and reconnecting the gear selection rod.
__________________
Mollers is offline   Reply With Quote
Old 12 July 2015, 14:25   #9
Member
 
Country: UK - England
Length: 3m +
Join Date: Sep 2008
Posts: 2,250
Quote:
Originally Posted by zip View Post
ok. good info.

I have been told to replace a impellor on a Konrad 520 isn't that difficult.
I understand that difficulty is a relative term depending on someone's knowledge, abilities and other factors, but is it necessary to remove the whole lower end?
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.
__________________
ShinyShoe is online now   Reply With Quote
Old 12 July 2015, 14:28   #10
Member
 
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,841
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.
Gawd! Yeah, don't be tempted to sacrifice an impellor in a hose fitting/cooling experiment.
__________________

__________________
Mollers 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 13:15.


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