Yanmar raw water cooling problem - Page 2 - SailNet Community
Reply
 
LinkBack Thread Tools
post #11 of 19 Old 06-08-2009 Thread Starter
Member
 
Join Date: May 2008
Location: Vancouver BC
Posts: 98
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
 
Not a lot of scoring. Some faint circular on the inside. Very little on the outer part. While definitely not a highly polished surface, but to my eye looked smooth enough for the gasket to work well.

Is it possible for pump to lose a prime from a leak later in the cooling system. I ask since when I changed the engine zinc the bolt that the zinc screws into was completely frozen. It is mounted into a small cover held on with 4 bolts. All of which moved easily. I was somewhat surprised that there was no gasket on that piece. It doesn't seem to leak, but could let air in I suppose.
noreault is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #12 of 19 Old 06-08-2009
Senior Member
 
Join Date: Jan 2007
Posts: 387
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
 
My cover was scored (circular, from the impeller wearing it) enough that you could see it easily, and catch it with a fingernail - maybe 1/32" - 1/16" or so.

Yours sound OK. I am not a mechanic, so maybe someome else can chime in. I think that if your raw water pump and impeller are in good shape, you shoudl not have water or air bypass it. I don't think any air leaks are good. However, air is always in the exhaust elbow, yet doesn't make it's way back through the heat exchanger, and then water pump. Your possible leak is quite far down the line, so it may not be an issue. I do think any leaks / loose clamps near the pump would facilitate the loss of prime.

Let us know how you make out.
Northeaster is offline  
Quote Quick Reply Share with Facebook
post #13 of 19 Old 06-17-2009
old guy :)
 
rikhall's Avatar
 
Join Date: Feb 2008
Location: Fredericton, NB, Canada
Posts: 1,060
Thanks: 13
Thanked 14 Times in 12 Posts
Rep Power: 8
 
No strainer on intake

Just my personal opinion.

I don't like a strainer on the outside of the boat covering the raw water intake. I prefer a Groco raw water strainer inside. With no covering strainer I can (worst case scenario) remove the hose and shove a close hanger wire down to clear it. We have the raw water strainer inside and we can see if there is sea weed or whatever in it.

Just my personal preference.

Irwin Citation 34
Mystery
rikhall is offline  
Quote Quick Reply Share with Facebook
post #14 of 19 Old 06-17-2009 Thread Starter
Member
 
Join Date: May 2008
Location: Vancouver BC
Posts: 98
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
 
Well thanks to all. Everything seems to be in good shape (knocking on wood as I say that). At least no lost of prime since the repair. My plan is to get a raw water strainer on the inside.
noreault is offline  
Quote Quick Reply Share with Facebook
post #15 of 19 Old 06-21-2009
Junior Member
 
Join Date: Oct 2007
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Excellent posts-very, very helpful
blueoctober is offline  
Quote Quick Reply Share with Facebook
post #16 of 19 Old 06-25-2009
Senior Member
 
Join Date: May 2007
Posts: 551
Thanks: 3
Thanked 3 Times in 3 Posts
Rep Power: 9
 
I completely agree. Exterior strainers cause many more problems than they solve.


Quote:
Originally Posted by rikhall View Post
Just my personal opinion.

I don't like a strainer on the outside of the boat covering the raw water intake. I prefer a Groco raw water strainer inside. With no covering strainer I can (worst case scenario) remove the hose and shove a close hanger wire down to clear it. We have the raw water strainer inside and we can see if there is sea weed or whatever in it.

Just my personal preference.
SteveInMD is offline  
Quote Quick Reply Share with Facebook
post #17 of 19 Old 06-25-2009
Cal 9.2 SilverSwan
 
roline's Avatar
 
Join Date: Jul 2000
Location: East Tennessee
Posts: 272
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 16
 
Speed seal does offer an alternative if your willing to pay the price. I like the idea of the Oring seal instead of sealants and gaskets. Paper gasket thickness should be around 0.003" thick possible glycerin treated paper for this application. We used it for rebuilding oil pumps to prevent excessive end play gaps to produce pressure loss.

Cal 9.2 #19 SilverSwan
roline is offline  
Quote Quick Reply Share with Facebook
post #18 of 19 Old 07-05-2013
Junior Member
 
Join Date: Jul 2013
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Re: Yanmar raw water cooling problem

A bit late to joint Q&A for this problem but I have a 1GM10 and have started with over heating after a new thermostat was fitted by the yard.

I have looked at the impeller housing and semi cleaned the gunk off a very thick gasket ( could this be the reason why it was over heating, not enough build up water preassure ? )and fitted a new yanmar gasket paper. Very thin. Problem was it wouldn't seal, so I applied a layer of gasket as an emergency as I was on a swinging mooring which wasn't safe. It worked for now but it hasn't run enough to get really hot and be checked.
I will have a go and clean everything up again and do checks.

My part to the questions. Is. At what point in time after starting engine. Did the water alarm sound off.

Regards
The Dysfunctional Sailor is offline  
Quote Quick Reply Share with Facebook
post #19 of 19 Old 04-15-2014
Junior Member
 
Join Date: Apr 2014
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Re: Yanmar raw water cooling problem

I had a similar problem with my 1982 Yanmar 3GMD but the cause was not the waterpump. The exhaust manifold was completely filled with black rusty slime - see photo. When I cleaned the inside mechanically (screwdriver, chisel, grinder etc) I discovered that the cover was pretty much rusted through - only the rust and slime had kept the water in - I'm glad the blockage happened when I was at the dock.. I am trying to get a new manifold from Yanmar - it's only available in Japan...
That's What Was Inside The Blocked Water Passage Photo by utopf | Photobucket
Hole In Cover Of Manifold Photo by utopf | Photobucket
uaglt is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Yanmar 2GM 20(F): Raw or Fresh Water Cooled version. How can I tell? captxtina Gear & Maintenance 8 06-04-2013 10:02 PM
Raw Water Cooling - No Water Coming Out montenido Gear & Maintenance 20 01-21-2009 04:16 PM
MD6A cooling water circuit.. groundhog Gear & Maintenance 0 09-11-2008 05:37 PM
Flushing/testing/preping an old water system on a new old boat tenuki Gear & Maintenance 8 04-19-2007 10:33 PM
Basic Thoughts on Tides Jim Sexton Seamanship Articles 0 11-17-2003 07:00 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome