engine overheating - SailNet Community
LinkBack Thread Tools
post #1 of 4 Old 05-13-2010 Thread Starter
Senior Member
Join Date: Apr 2010
Location: Maui, HI
Posts: 105
Thanks: 3
Thanked 1 Time in 1 Post
Rep Power: 6
engine overheating

to put some context : I am a rookie and this is my first boat.
Got a Beneteau 43' from 92 with a Perkins Prima 50hp with 1000 hours.

now we went out a couple of time and motored without any issues for a dozen of hours (since we got the boat).

Last week, coming back to the marina, alarm rings and lot of white smoke.
did not think about dropping anchors, we made our way to the slip in 5-10 minutes. There was not water anymore from the exhaust.
Friends told me : Impaler or filter. Fine.
Today we check both. nothing wrong. we put the impaler back for a test. now everything is running fine (for 2 minutes, at the deck). well, i will change the impaler anyway, but still wondering : if nothing is wrong anymore, what happened ? i suppose i would have prefer something obvious, something broken.
Seaweed in the Intake ? got away by itself in the last couple of days ? simple overheating of the engine (too high ? did not remember being specifficaly aggressive and it ran literally for 5 minutes before the alarm beeped) ? Stuck impaler that does not show it and putting in and out solved the issue ?
The level of coolant seemed kind of low, but ive got hard time believing it s the issue as we motored with this for a dozen of hours two weeks ago.

Any help / opinion appreciated.
thevdeub is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
post #2 of 4 Old 05-13-2010
Senior Member
celenoglu's Avatar
Join Date: Dec 2008
Posts: 684
Thanks: 0
Thanked 15 Times in 14 Posts
Rep Power: 7
Since everything is fine now, it seems to be a blockage in the sea water intake. The most possible cause is a nylon bag blcing the sea water intake. Smaler particles are generally sucked by the impeller and are kept by the filter, but a layer of nylon bag or similar covers the intake from the outside and is never released before you stop the engine. although your impeller seems in a good condition, it might have over heated because no water was present. It is a god idea to change the impeller which might have been "burned" during the accident.
celenoglu is online now  
Quote Quick Reply Share with Facebook
post #3 of 4 Old 05-13-2010 Thread Starter
Senior Member
Join Date: Apr 2010
Location: Maui, HI
Posts: 105
Thanks: 3
Thanked 1 Time in 1 Post
Rep Power: 6
I see. We are sailing in SF bay, lot of floating garbage ...
If that happen again, what could be the best thing to do ? stop the boat and let the pressure go down to try to get ride of this ? any easy way to expel the water from the intake to push the blocking bag out ?
thevdeub is offline  
Quote Quick Reply Share with Facebook
post #4 of 4 Old 05-13-2010
Senior Member
Gene T's Avatar
Join Date: May 2006
Location: Left Coast USA
Posts: 666
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
It is a good idea to pay attention to the sounds your boat makes. Easy to tell when you lose water flow. The exhaust sound will change. That will happen way before the engine overheats.

If you loose water flow first thing is to look below and see if you have a leak. Then shut off the engine. Wait a min for the intake to clear and restart the engine. I have never had this happen but you could get a plastic bag in the intake. You will loose suction as soon as the engine is shut off. If you have water flow after starting the engine, you should know within a min of starting it then that was probably the problem. But: other things can happen. The impeller can slip on its collar and look ok but fail to pump. This generally happens on starting the engine however. You really need to run the engine up to temp and not just for a few min at the dock. Make sure your dock lines are good and run it in gear. How hard you push it is up to what you feel comfortable with but I have run it pretty hard in order to warm up the engine properly at the dock. Take the time to understand how the cooling system works. If you understand how your fuel system and cooling system work you will be able to troubleshoot your engine much more easily.


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

Currently in Long Beach, CA
Gene T is offline  
Quote Quick Reply Share with Facebook

Quick Reply

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


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

Email Address:


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
Runaway Diesel Engine Ben Hilke Gear and Maintenance Articles 0 07-19-2004 09:00 PM
Caring for the Cruising Outboard Doreen Gounard Gear and Maintenance Articles 0 04-22-2003 09:00 PM
Surveying a Diesel Engine Tom Wood Buying a Boat Articles 0 01-26-2003 08:00 PM
Surveying a Diesel Engine Tom Wood Gear and Maintenance Articles 0 01-26-2003 08:00 PM
Replacing the Diesel Engine Sue & Larry Gear and Maintenance Articles 0 06-12-2000 09:00 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