Engine Check Out - SailNet Community
 
LinkBack Thread Tools
post #1 of 6 Old 05-14-2007 Thread Starter
Member
 
Join Date: Mar 2006
Posts: 70
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
 
Engine Check Out

Finally after 13 months my boat is headed back into the water. During her time on the hard the engine was only run long enough to siphon antifreeze through the cooling system. Now I want to check out / service the engine before the yard puts her back in the water.

The engine is a Yanmar 3GMD. This model doesn't have a heat exchanger just raw water cooling. My question is this: Should I be concerned about using pressurized water,(from a hose) applied to the input side of the raw water pump while I'm checking things out?

Once I know the engine runs satisfactorly, I'll wait until she is back in the water to complete the maintenance.
Duke
Duke 7184 is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 6 Old 05-14-2007
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 15 Times in 12 Posts
Rep Power: 14
         
Very unlikely, but it depends on how the water is going to get into the cooling system and how high the water pressure is. If you're not using a strong mechanical fitting to attach the water supply to the through-hull, I doubt that you will generate enough water pressure to damage the cooling system.

If your marina has very high water pressure*, and you've screwed the hose into the through-hull or used some other very secure method to attach the hose to the through hull, you might have a problem. However, I think it is far more likely that a hose or hose clamp would give than the metal inside the cooling system... but YMMV.

*At my previous house, the water came in at almost 110 PSI, and we needed a pressure regulator added to the water system to prevent it from damaging the pipes and fixtures. Normally, water systems are at about 60 PSI IIRC.

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.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #3 of 6 Old 05-14-2007 Thread Starter
Member
 
Join Date: Mar 2006
Posts: 70
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
 
SD,
I thought about using a 5 gal. bucket inside the boat; using a buddy to keep the water at an appropiate level and allowing the raw water pump to draw form the bucket using a seperate line.

I don't care much for this idea because it adds so much clutter around the engine where I need all the space I can get.
Duke
Duke 7184 is offline  
Quote Quick Reply Share with Facebook
post #4 of 6 Old 05-14-2007
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 15 Times in 12 Posts
Rep Power: 14
         
It also can cause problems if you're clumsy and knock the bucket over... besides, that isn't really going to tell you if everything is in good working order, which using an adapter to the thru-hull will... like you raw water strainer, and such... if you have an obstruction in the raw water lines, better to find out about it now, than when you're in the water IMHO.

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.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #5 of 6 Old 05-15-2007
Senior Member
 
Omatako's Avatar
 
Join Date: Sep 2003
Location: Auckland New Zealand
Posts: 2,552
Thanks: 1
Thanked 33 Times in 30 Posts
Rep Power: 12
 
Sorry to be contradictory but it is better to find some way of allowing the raw water pump to draw it's own water. If you use pressure to push water into the system the cooling system will work even if the impeller is shagged because the water will flow past the spinning impeller under pressure.

Better to find some way of creating an artificial "pond" to draw from like a toilet plunger head pushed up against the hull over the intake skin fitting, connected to a hose which is inserted into a bucket which is filled from the hose and which is held at about the same level as the skin fitting (gasp)

That way you'll sort of simulate the same conditions your engine will be confronted with when in the water.

Hope this makes some sense.
Andre
Omatako is offline  
Quote Quick Reply Share with Facebook
post #6 of 6 Old 05-15-2007
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 15 Times in 12 Posts
Rep Power: 14
         
Andre-

A very good point...but often more difficult for the person to rig up than a hose connected to the through hull fitting.

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.
sailingdog 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
Surveying a Diesel Engine Tom Wood Buying a Boat Articles 0 01-26-2003 07:00 PM
Surveying a Diesel Engine Tom Wood Gear and Maintenance Articles 0 01-26-2003 07:00 PM
Replacing the Diesel Engine Sue & Larry Gear and Maintenance Articles 0 06-12-2000 08:00 PM
Safety Check Mark Matthews Seamanship Articles 0 01-25-2000 07:00 PM
Safety Check Mark Matthews Gear and Maintenance Articles 0 01-25-2000 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