Over heating Diesel - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > General Interest > General Discussion (sailing related)
 Not a Member? 


Reply
 
LinkBack Thread Tools
  #1  
Old 02-26-2006
Junior Member
 
Join Date: May 2001
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Captnbn is on a distinguished road
Over heating Diesel

I have a friend who is cruising and recently experienced some overheating issues with his Perkins 4-108 while heading from Sawyer Key to Key West. He indicated he'd checked the impeller, the raw water strainer, exhaust and even cleaned his heat exchanger. The problem seemed to go away, but he was curious as to what else he could have checked. I indicated I would post his question, so thanks to anyone that can provide some insight. He also said that he had on a couple of occassions found crab pot lines tanled around his keel and prop.
Reply With Quote Share with Facebook
  #2  
Old 02-26-2006
marinedtcomRob's Avatar
CEO - SailNet.com
 
Join Date: Oct 2005
Location: Durham, CT
Posts: 42
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
marinedtcomRob is on a distinguished road
other items to check re overheating on Perkins 4.108

I too have a Perkins 4.108 on my Little Harbor 38. The other two items to consider checking would be the thermostat to make sure it opens at the rated temperature (do this on a stove, placing the removed thermostat in a pot of water with a cooking thermometer) and check and / or replace the temperature sender. What you listed as done probably fixed the problem, but if not, these are to two remaining items I can think of to look into.

Regards,

Rob Proctor
SailNet.com
Reply With Quote Share with Facebook
  #3  
Old 02-27-2006
administrator's Avatar
Administrator
 
Join Date: Jan 2000
Location: maryland
Posts: 1,888
Thanks: 3
Thanked 17 Times in 9 Posts
Rep Power: 10
administrator has disabled reputation
I concur with Rob on his advice. The thermostat is often the culprit - especially on boats that sit for long periods in salt water. On engines that do not get flushed, barnacles have a tendency to grow inside the housing around the thermostat. Here's a picture of barnacles growing inside a thermostat housing cover. The barnacles can impede the opening of the thermostat, thus causing the engine to run hotter that it should. "Salt never sleeps"
Attached Thumbnails
Over heating Diesel-barnacle.jpg  

Last edited by administrator; 02-28-2006 at 05:14 PM.
Reply With Quote Share with Facebook
  #4  
Old 02-27-2006
Senior Member
 
Join Date: May 2004
Location: Long Is.
Posts: 329
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 11
gc1111 is on a distinguished road
I have a Westerbeke 4-107 which is a Perkins "marinized" by Westerbeke. I don't know if this applies to the 4-108, but I had an overheat problem last summer. It turned out to be the oil cooler heat exchanger which had clogged with old disintegrated zincs. This engine has 3 heat exchangers, the main fresh water cooling, a transmission fluid cooler, and the direct oil cooler. If any one of them restricts water flow the engine overheats. Normally I would notice this in the amount of water in the exhaust (my boat exhausts out the side, above the water) but it had been bad since I bought the boat and I thought it was normal (until it was fixed). I guess this is a tribute to the safety factor that was built into the heat disposal design.
Reply With Quote Share with Facebook
  #5  
Old 02-28-2006
Senior Member
 
Join Date: Nov 2001
Posts: 161
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 13
Valdare is on a distinguished road
We just had a great discussion on the Morgan board reguarding this subject. One new thing that came out for most was that the 4-108 needs to be blead. Not many of the participants were awear that after bleeeding the system properly another 1/2 gallon of anti freeze mixture will be necessary. Check out the archives for spacifics.

John
Reply With Quote Share with Facebook
  #6  
Old 02-28-2006
Junior Member
 
Join Date: May 2001
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Captnbn is on a distinguished road
Thanks to all for replying. As of now it appears that cleaning the heat exchanger solved the problem although he is going to check the thermostat.
Reply With Quote Share with Facebook
  #7  
Old 03-01-2006
Cruiserwannabe's Avatar
Senior Member
 
Join Date: Jan 2006
Posts: 248
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
Cruiserwannabe will become famous soon enough
Alot of very respectable answers here to which I would like to add cavatation,and possible head and or gasket problems but you would probly notice more loss of cooling fluid or cooling in with the oil resulting in a creamy color on your engine oil dipstick, none of which should be taken lightly,find the problem!
good luck Brad
Reply With Quote Share with Facebook
  #8  
Old 03-02-2006
p32 p32 is offline
Junior Member
 
Join Date: Sep 2004
Posts: 20
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
p32 is on a distinguished road
Check the mixing elbow, that's the piece where the raw water enters the engine exhaust flow. Usually the exhaust is a rubber hose after the mixing elbow. Mixing elbows have a rough and relatively short life and if they get plugged up, it doesn't matter how clean your heat exchanger is, there will not be sufficient raw water to exchange the heat.
Reply With Quote Share with Facebook
  #9  
Old 03-20-2006
sailandoar's Avatar
Senior Member
 
Join Date: Mar 2006
Location: Cape Fear, NC, USA
Posts: 208
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
sailandoar is on a distinguished road
Back Pressure!!!

Excessive back pressure can cause loss of power and overheating.

Following up on the previous post by 'P32'. Back pressure due to corrosion or carbon in the exhaust outlet/mixing elbow is often a culprit. The elbow should be checked as part of annual or bi-annual maintenance. Another cause of excessive back pressure can be the exhaust hose or the exhaust outlet. Assuming that things are properly constucted initally something like an overheating episode can cause the exhaust hose to partailly collapse and raise back pressure. Changing trim of the vessel can bury the exhaust port on certain points of sail and increase back pressure.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
fuel consumption gas vs diesel jklewissf Gear & Maintenance 25 05-11-2013 07:28 PM
Diesel vs 4 stroke outboard??? bugged Gear & Maintenance 21 11-28-2010 06:15 PM
Diesel Stoves santeana Living Aboard 5 12-01-2004 02:57 AM
gas vs diesel reid5009 Living Aboard 1 02-07-2003 12:43 PM
diesel tachometer diesel MHRitter Gear & Maintenance 1 09-17-2002 11:52 AM


All times are GMT -4. The time now is 07:27 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.