Raw Water Valve/Impeller Confusion - 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 > Engines > Gas > Atomic 4
 Not a Member? 


Like Tree1Likes
Reply
 
LinkBack Thread Tools
  #1  
Old 04-02-2013
Senior Member
 
Join Date: Mar 2013
Location: NC
Posts: 386
Thanks: 32
Thanked 19 Times in 19 Posts
Rep Power: 2
FirstCandC is on a distinguished road
Raw Water Valve/Impeller Confusion

I realize you are supposed to start the A-4 and THEN open your water intake valve, but doesn't that cause damage to your impeller? On every outboard I have ever flushed, the manual states that you should always have water coming in prior to starting.
Also, how long should you run the engine before opening the valve?
Thanks.
__________________
1977 C&C 27 MKIII
Sea Mist
Reply With Quote Share with Facebook
  #2  
Old 04-02-2013
Faster's Avatar
Just another Moderator
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 14,743
Thanks: 69
Thanked 203 Times in 195 Posts
Rep Power: 10
Faster has a spectacular aura about Faster has a spectacular aura about Faster has a spectacular aura about
Re: Raw Water Valve/Impeller Confusion

If you are confident the engine will start almost immediately, then you can open the seacock before you start and your impeller will thank you.

If, on the other hand, the engine doesn't actually catch in the first few seconds of cranking, then you should shut the RW off as you continue attempts to start - you should open the through hull immediately after the engine is running.
downeast450 likes this.
__________________
Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
Reply With Quote Share with Facebook
  #3  
Old 04-02-2013
Senior Member
 
Join Date: Mar 2013
Location: NC
Posts: 386
Thanks: 32
Thanked 19 Times in 19 Posts
Rep Power: 2
FirstCandC is on a distinguished road
Re: Raw Water Valve/Impeller Confusion

Thanks. The one time that it did start, it really pulled a lot of water out of the bucket, so I guess the water pump is doing ok.
__________________
1977 C&C 27 MKIII
Sea Mist
Reply With Quote Share with Facebook
  #4  
Old 04-02-2013
MikeOReilly's Avatar
Senior Member
 
Join Date: Apr 2010
Location: Thunder Bay, Ontario
Posts: 1,113
Thanks: 103
Thanked 51 Times in 45 Posts
Rep Power: 5
MikeOReilly is on a distinguished road
Re: Raw Water Valve/Impeller Confusion

I've never heard that you should start an Atomic-4 before opening the water intake as standard practice, and I owned one for nearly 10 years. Never did that. If you're having troubles starting, where there is a risk the cooling water can fill the muffler and then back up into the cylinders, then yes, shut off the intake. But that's only if the engine is turning over (and not starting) for a while: more than 30 seconds I would think, depending on your exhaust system's setup.

Starting the engine without water lubricating the impeller will cause it to wear. If you're having to run without coolant (water) for a while, then you could take the impeller out.
__________________
Why go fast, when you can go slow.
Reply With Quote Share with Facebook
  #5  
Old 04-02-2013
tommays's Avatar
Senior Member
 
Join Date: Sep 2008
Posts: 4,253
Thanks: 1
Thanked 26 Times in 26 Posts
Rep Power: 7
tommays will become famous soon enough
Re: Raw Water Valve/Impeller Confusion

If the motor is not firing in about 3 seconds its BROKEN and that is on a COLD DAY

The manual choke lets it pull in fuel very EASY
__________________
1970 Cal 29 Sea Fever

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

1981 J24 Tangent 2930
Tommays
Northport NY


If a dirty bottom slows you down what do you think it does to your boat
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #6  
Old 04-02-2013
Senior Member
 
Join Date: Mar 2013
Location: NC
Posts: 386
Thanks: 32
Thanked 19 Times in 19 Posts
Rep Power: 2
FirstCandC is on a distinguished road
Re: Raw Water Valve/Impeller Confusion

The choke is stuck- I mean REALLY stuck. Going to try to fix that this weekend, and change the oil, gas, etc.
BTW Tommays you are my HERO, I love your blog.
__________________
1977 C&C 27 MKIII
Sea Mist
Reply With Quote Share with Facebook
  #7  
Old 04-02-2013
deniseO30's Avatar
Move over Joan Rivers!
 
Join Date: Nov 2006
Location: Bristol pa
Posts: 6,147
Thanks: 52
Thanked 89 Times in 79 Posts
Rep Power: 9
deniseO30 will become famous soon enough deniseO30 will become famous soon enough
Re: Raw Water Valve/Impeller Confusion

I think the A4 uses the Oberdorfer pump. when it comes to replacing the impeller DO NOT get the blue ones from Globe they are too short. GET OEM Oberdorfer.
jus sayin...
__________________
Denise, Bristol PA, Oday 30. On Tidal Delaware River, Anchor Yacht Club. New Website!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

my current "project"!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #8  
Old 04-03-2013
Senior Member
 
Join Date: Mar 2013
Location: NC
Posts: 386
Thanks: 32
Thanked 19 Times in 19 Posts
Rep Power: 2
FirstCandC is on a distinguished road
Re: Raw Water Valve/Impeller Confusion

Noted!
__________________
1977 C&C 27 MKIII
Sea Mist
Reply With Quote Share with Facebook
  #9  
Old 04-09-2013
Lubrdink's Avatar
S/V Glenn E
 
Join Date: Aug 2011
Location: Jefferson County, KS
Posts: 77
Thanks: 20
Thanked 3 Times in 3 Posts
Rep Power: 4
Lubrdink is on a distinguished road
Re: Raw Water Valve/Impeller Confusion

I'm going to replace my impeller for the first time this week. We ran the A4 last year after purchase so not sure how long it's been since it was replaced. Does anyone know if, under normal wear and tear, whether the impeller will pull off easily or will it require a puller? I hope the former but want to be prepared just in case.
Thanks,
__________________
"Sailing with a hero"
Honoring S/Sgt Glenn English, Jr, Congressional Medal of Honor for heroism that cost his life in Viet Nam, 9/7/70.
Newport 27 built 1970-Hull # N270088
Reply With Quote Share with Facebook
  #10  
Old 04-09-2013
Faster's Avatar
Just another Moderator
 
Join Date: Sep 2005
Location: New Westminster, BC
Posts: 14,743
Thanks: 69
Thanked 203 Times in 195 Posts
Rep Power: 10
Faster has a spectacular aura about Faster has a spectacular aura about Faster has a spectacular aura about
Re: Raw Water Valve/Impeller Confusion

The impeller should not need a puller, but if its been there a while you may need to use a couple of screwdrivers to pry the impeller straight out.. Remember to protect the gasket surface of the housing if you need to resort to this.
__________________
Ron

1984 Fast/Nicholson 345 "FastForward"

".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
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
Changing A Raw Water Impeller (How To) Maine Sail Gear & Maintenance 37 04-29-2014 07:54 PM
Raw Water Pump Impeller casey1999 Diesel 14 01-24-2013 12:34 PM
Raw water impeller Hobos Gear & Maintenance 2 09-14-2008 07:10 AM
raw water impeller change davidcms Gear & Maintenance 5 09-07-2008 12:22 PM
Sea Water Pump Impeller nauticalrich Gear & Maintenance 3 03-19-2003 08:20 AM


All times are GMT -4. The time now is 08:11 AM.

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.