Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 04-08-2014, 13:11   #1
Registered User

Join Date: Oct 2012
Location: Alberta, Canada
Boat: Beneteau 393
Posts: 20
Westerbeke 44A4 - Overheat

Hi

My first marine engine problem...

My engine overheated even at 1100 RPM while I was heating the oil up for a oil change. There was raw water flow, what seemed like a normal amount.

The engine has been using a little bit of coolant over the last 6 months but lately hasn't used any. I figured out that the line was plugged between the reservoir and the cap. I cleaned that out and then started the engine back up. I had a continuous stream of bubbles coming up the reservoir line.

Where could the coolant be going? What is the best way to bleed the air out of the system.

Thanks

Richard
__________________

__________________
Richwink is offline   Reply With Quote
Old 04-08-2014, 13:30   #2
Registered User
 
mcerdos's Avatar

Join Date: Jan 2011
Location: Full time cruiser
Boat: Amel Super Maramu 53
Posts: 187
Re: Westerbeke 44A4 - Overheat

There could be a lot going on here. The coolant should not be filled at the expansion reservoir. If you are doing this it could be the cause of your bubbling. It should be filled at the cap. Some bubbling, at first, is normal.

It is differcult to help without knowing the age of the engine and the mainteince performed.

Here are some common things to check:
  1. Raw Water Impeller – the most common source. A spoke of the plastic impeller breaks off and clogs the raw water flow. Easy fix: buy a new impeller. Be sure to find and remove any missing impeller blades
  2. Mixing Elbow – Corrosion here blocks the flow. Solution is a new or boiled out elbow.
  3. Heat Exchanger – Scale builds up in the heat exchanger. Solution is to snake with a wire and dip in acid.
  4. Thermostat Sensor/Receiver – Is the thermostat stuck? Or is the engine even overheating? Check the exhaust temperature. How hot is the water? Shoot a heat sensor on the water reservoir.
  5. Fresh Water Tank/Coolant – Is it leaking?
  6. Hoses – Delamination inside engine hoses restricts the flow, causing the engine to overheat.
  7. Fresh Water Pump – An aluminum impeller inside the pump can corrode and limit flow.
  8. Oil Cooler – Similar to the heat exchanger. You cannot snake her out because the tubes narrow at the ends but dipping the cooler in an acid bath does the job.
  9. Over-propped – Too large a diameter or too much pitch can cause an engine to overheat prematurely. Correlates with not reaching full RPM’s. Is the prop clean and have any changes been made?
  10. Aeration – Air getting in from a leak in the line anywhere can lead to overheating.

Hope this helps get you started.
__________________

__________________
All the best,
Mark
www.creampuff.us
mcerdos is offline   Reply With Quote
Old 04-08-2014, 14:17   #3
Marine Service Provider
 
Scott Berg's Avatar

Join Date: Jul 2011
Location: Aboard
Boat: Seaton 60' Ketch
Posts: 958
Re: Westerbeke 44A4 - Overheat

Open the cap, start the engine and run up the temp till the thermostat opens (use a thermometer in the coolant) and watch to see if it 'burps' and the level drops. After the burp, kill the engine, top up, fill the overflow to the cool line, and try again.... If that doesn't work you need to go step by step as above; I'm just pointing you to the easy fix....


Sent from my iPad using Cruisers Sailing Forum
__________________
Scott Berg
WAØLSS
SV CHARDONNAY
Scott Berg is offline   Reply With Quote
Old 04-08-2014, 14:26   #4
Registered User
 
mcerdos's Avatar

Join Date: Jan 2011
Location: Full time cruiser
Boat: Amel Super Maramu 53
Posts: 187
Re: Westerbeke 44A4 - Overheat

Quote:
Originally Posted by Scott Berg View Post
Open the cap, start the engine and run up the temp till the thermostat opens (use a thermometer in the coolant) and watch to see if it 'burps' and the level drops. After the burp, kill the engine, top up, fill the overflow to the cool line, and try again.... If that doesn't work you need to go step by step as above; I'm just pointing you to the easy fix....


Sent from my iPad using Cruisers Sailing Forum
Yes. A very easy way to check the thermostat.
__________________
All the best,
Mark
www.creampuff.us
mcerdos is offline   Reply With Quote
Old 04-08-2014, 16:49   #5
Registered User

Join Date: Oct 2012
Location: Alberta, Canada
Boat: Beneteau 393
Posts: 20
Re: Westerbeke 44A4 - Overheat

Hi

Will do the cap test tomorrow. The overheat occurred at the dock in neutral at 1100.

The raw water was flowing really good coming out of the boat. There was some debris in the raw water heat exchanger so I cleaned that out.

The engine is 2002 with only 2100 hours on it. Normally runs like a top.

Hoperfully that cures it. Will let you know.

Richard
__________________
Richwink is offline   Reply With Quote
Old 05-08-2014, 17:40   #6
Registered User

Join Date: Oct 2012
Location: Alberta, Canada
Boat: Beneteau 393
Posts: 20
Re: Westerbeke 44A4 - Overheat

Hi

Cap test worked... Got all the air out and ran the engine for about 1/2 half hour. Also got a infrared thermometer which made checking this much easier.

Thanks Forum for all the help.

Richard
__________________
Richwink is offline   Reply With Quote
Old 05-08-2014, 18:45   #7
Registered User
 
mcerdos's Avatar

Join Date: Jan 2011
Location: Full time cruiser
Boat: Amel Super Maramu 53
Posts: 187
Re: Westerbeke 44A4 - Overheat

Quote:
Originally Posted by Richwink View Post
Hi

Cap test worked... Got all the air out and ran the engine for about 1/2 half hour. Also got a infrared thermometer which made checking this much easier.

Thanks Forum for all the help.

Richard
Glad to have helped. Also glad it was a simple fix and not expensive. The infrared thermometer is a great tool. I have a log book of "normal" temps.
__________________

__________________
All the best,
Mark
www.creampuff.us
mcerdos is offline   Reply With Quote
Reply

Tags
westerbeke

Thread Tools
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
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 06:33
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 02:50



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 03:08.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.