Cruisers Forum
 


Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 04-05-2021, 06:23   #1
Registered User

Join Date: Jul 2017
Location: Pensacola Beach, FL
Boat: Bene 42CC
Posts: 44
Engine Overheat After Haulout

Folks, looking for some insight. Yesterday we did a sea trial and survey haulout on a Bene 42CC (Volvo D2-55) that I am buying. After re-splash, engine started normally and the captain confirmed that exhaust was pumping water. A few minutes underway, we got an overheat alarm and I got the headsail out and shut the engine down. Capt and surveyor checked things out and discovered that we damaged the impeller - luckily we had a spare and they did a quick swap. Engine restarted and ran normally afterwards. The hypothesis is that during the haul, we got air into the raw water system and should have "burped" the strainer.
Questions for the group:
1. Is this a common phenomenon after haulout?
2. As a future procedure, how quickly after starting should I burp the strainer? Is this written up anywhere or is it just tribal knowledge?
3. Should I be suspicious of anything in the raw water intake system?
Thanks in advance for not turning this into a debate on the merits of Benes or Volvos.
Hhew is offline   Reply With Quote
Old 04-05-2021, 06:44   #2
Registered User

Join Date: Dec 2011
Location: New York
Boat: Columbia 50
Posts: 627
Re: Engine Overheat After Haulout

It probably wasn’t actually moving water when he checked, just blowing out the last of what was in the muffler. Pulling the boat caused the raw water intake to lose prime, and you burnt up the propeller from running dry.
Very common, and you should ‘burp’ it on splash, BEFORE starting the engine.
Strainers draw water from the top - if there’s air in there, and the impeller is old, good possibility it won’t self-prime, thus burning up.
Make sure the strainer is at a height where it will fill just by removing the cover plate - I had a cape dory 28 where the strainer was located too high - would lose prime sailing in moderate waves, when the intake was uncovered from heeling - royal pain to prime that sucker......had to close the sea pck, fill the strainer with water, seal it up, start the motor and immediately open the sea cock.


Matt
mlydon is offline   Reply With Quote
Old 04-05-2021, 06:56   #3
Registered User

Join Date: Sep 2008
Location: Chesapeake Bay
Boat: Hunnter Legend 37.5
Posts: 859
Re: Engine Overheat After Haulout

Just had this problem yesterday after getting my boat back in the water. Probably going to replace the thermostat and mixing elbow, now, too, as a result. I even had a new impeller placed prior to running. Oh, well. Live and learn.
bensolomon is offline   Reply With Quote
Old 04-05-2021, 07:00   #4
Registered User
 
TheOffice's Avatar

Join Date: Jun 2012
Location: Annapolis
Boat: Hylas 49
Posts: 1,019
Re: Engine Overheat After Haulout

Had to burp my Vetus every haulout. Just loosened the screws on the pump. Eventually pumps seals were bad.
TheOffice is offline   Reply With Quote
Old 04-05-2021, 07:14   #5
Marine Service Provider

Join Date: Jun 2019
Location: Southern California
Posts: 317
Images: 2
Re: Engine Overheat After Haulout

This is the most common thing I see in my world, airlocks. easy fix...close the intake before you haul out, open when you are back in the water.
Coolerking is offline   Reply With Quote
Old 04-05-2021, 09:01   #6
Registered User

Join Date: Feb 2015
Posts: 37
Re: Engine Overheat After Haulout

All good advice above. As a preventive measure we always close the seacocks prior to haulout to preserve the prime.
brmoney is offline   Reply With Quote
Old 04-05-2021, 09:01   #7
Registered User

Join Date: Feb 2016
Location: Southport, NC
Boat: Pearson 367 cutter, 36'
Posts: 633
Re: Engine Overheat After Haulout

Not familiar with your engine, but another possible solution is to lubricate the impeller with Dawn dishwashing liquid before re-start, assuming it's easy to get to. I do this with new impellers on my Westerbeke 40 and have never had an issue. The Dawn lubricates the impeller until water reaches the water pump.
AJ_n_Audrey is online now   Reply With Quote
Old 04-05-2021, 16:20   #8
Registered User

Join Date: Dec 2014
Posts: 683
Re: Engine Overheat After Haulout

A good idea is to install a bleeder valve; after and higher than the intake filter to allow "burping". Connect, via a small valve, a clear half inch hose that is arranged vertically and has its hose top higher than your outside LWL. To bleed or burp the system, you just slowly open the valve and watch the water enter, flood the system and rise up in the clear tube stopping when at the LWL. This does require that the filter is actually below the LWL. Also the impeller pump must be after the filter, not before it. Don't forget to then close the small valve to prevent the impeller pump from sucking in air via the clear hose!

The hose can be used for at least two other applications.
The first one is that if you spend a long time at a jetty, you can connect the local fresh water supply to the hose top (after you have also opened the skin fitting valve to prevent over pressurizing the system). Run the engine and then after the engine has been fresh water flushed (taste the exhaust water) turn off the engine and let the fresh water run for a minute or so. This will reduce salt water corrosion and organic build up in the system plus it can be used to "back flush" and clean the intake filter.

The second advantage is that by opening the skin fitting valve and the clear half inch hose valve and blowing lung powered air down the half inch hose, you can remove all the water from the system down to the open intake skin fitting valve (which is then closed while air is bubbling out). Helpful for doing maintenance on the filter hoses etc. or even the intake impeller.
It's all pretty simple and I have had a number of other boaties copy it.
billgewater is online now   Reply With Quote
Reply

Tags
engine

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Coolant leak after overheat Ryban Engines and Propulsion Systems 2 28-05-2017 10:30
4.236 Initial Overheat - Plumbing ? Fluenta Engines and Propulsion Systems 17 11-11-2013 09:55
Audible Overheat Alarm For Engine Pam Baker Engines and Propulsion Systems 3 25-04-2013 05:33
Perkins 4.236 Overheat meuritt Engines and Propulsion Systems 3 27-02-2013 22:31
Dangerous Overheat? brianontheroad Engines and Propulsion Systems 13 29-07-2008 01:50

Advertise Here


All times are GMT -7. The time now is 16:26.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.