Yanmar still overheating - 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 > On Board > Gear & Maintenance
 Not a Member? 


Like Tree3Likes
Reply
 
LinkBack Thread Tools
  #1  
Old 08-12-2013
THEFRENCHA's Avatar
Senior Member
 
Join Date: Jan 2003
Posts: 111
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 12
THEFRENCHA is on a distinguished road
Yanmar still overheating

Hello looking for your advices AGAIN on my yanmar
That is my 3rd I had never any problem with both my 3GM series but this 3YM 30 is absolutely not reliable on long cruises!

Not even mentioning today the poor electric wires and harness o
From Yanmar I solved this problem with a direct push start button connect directly on solenoid !

At first I had very little water at exhaust and overheating after 5 minutes run even at low RPM A good engine rince with phosphatic acid took care of this and now I have very good water flow
Yesterday coming back from Cape Cod to Boston with no wind and perfectly flat sea. 60 miles under power.

Highest possible RPM is 3600 so fine according to the Yanmar specs , and then I should cruise at 3200

Here is my problem If cruising at 2600 absolutely no temp problem
At 2800 I get some grayish smoke but no overheat and all is well
At 3000 I get lots of grayish smoke, perfect water flow, BUT then afetr 10 minutes, engine overheat and alarm comes on.

When I shut engine down, engine cools in 20 minutes and if I restart and cruise at 2600 all is fine for hours.

Could it be the coolant? Level is fine but I that is the original coolant with now 250 hours in 4 years. Does a coolant degrades by itself?.

And what is your recommendation of best coolant for the Yanmar 3ym30 ?

Lots of questions but I know that many owners of Yanamar had to deal with this problem so your advices will save me time in researches.

Thanks
Reply With Quote Share with Facebook
  #2  
Old 08-12-2013
Tim R.'s Avatar
Senior Member
 
Join Date: Mar 2003
Location: Portland, Maine
Posts: 1,540
Thanks: 1
Thanked 26 Times in 25 Posts
Rep Power: 12
Tim R. is on a distinguished road
Re: Yanmar still overheating

I would start by removing the coolant and checking the heat exchanger core. The flush only cleans one side of it. You could have scale/build-up on the fresh water side.
__________________
Tim R.
Out cruising
1997 Caliber 40LRC

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

-----------------------------------------------------
Reply With Quote Share with Facebook
  #3  
Old 08-12-2013
Senior Member
 
Join Date: Feb 2007
Location: michigan
Posts: 281
Thanks: 3
Thanked 1 Time in 1 Post
Rep Power: 8
cruisingdream is on a distinguished road
Re: Yanmar still overheating

I wouldn't think it was the coolant, but your coolant should be changed every couple years also there are additives for diesel engine coolant that helps maintain laminar flow of coolant around the cylinders (prevents bubbles forming around cylinders) which prevents overheating and errosion of the cylinder walls.

The grey smoke is probably the big indicator (probably steam) you may have good water flow out the exhaust but may still have a partially plugged heat exchanger with a good flow from the water pump masking the fact that it is plugged.
Reply With Quote Share with Facebook
  #4  
Old 08-12-2013
asdf38's Avatar
Senior Member
 
Join Date: Jul 2010
Posts: 676
Thanks: 1
Thanked 4 Times in 4 Posts
Rep Power: 5
asdf38 is on a distinguished road
Re: Yanmar still overheating

Ok this is sort of a long shot by were you coming into the harbor at about 8pm last night with like 5 people and a kayak on deck?

That's my recollection of a pretty damn similar boat coming into Boston last night while I was out. We sailed past pretty close. (If so you were dragging the line to the kayak. Heh).
__________________
1979 Contessa 26
Boston, Ma
Reply With Quote Share with Facebook
  #5  
Old 08-12-2013
THEFRENCHA's Avatar
Senior Member
 
Join Date: Jan 2003
Posts: 111
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 12
THEFRENCHA is on a distinguished road
Re: Yanmar still overheating

Nope . By 8 already at the bar at CPYC!
No kayak and only 3 people on board
Easy to spot my boat White hull White deck and ..a big French flag painted on both side of bow


Where are you in Boston harbor ? Hail me radio next time !Always nice to meet a sailnet fellow member
Reply With Quote Share with Facebook
  #6  
Old 08-12-2013
THEFRENCHA's Avatar
Senior Member
 
Join Date: Jan 2003
Posts: 111
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 12
THEFRENCHA is on a distinguished road
Re: Yanmar still overheating

Thanks Tim R and cruisingdream
Do you mean that there are 2different and separated section in a heat exchanger ?
1 for the seawater flow and 1 for the coolant?
Meaning that I flushed with acid by way of the water pump
Should I drain the coolant and re flush by way of the coolant tank

I was under the impression that coolant and water mix at the entrance of heat exchanger not after

Thanks
Reply With Quote Share with Facebook
  #7  
Old 08-12-2013
Mechsmith
 
Join Date: Jun 2009
Location: Almost Heaven West Virginia
Posts: 198
Thanks: 1
Thanked 13 Times in 12 Posts
Rep Power: 6
Mechsmith is on a distinguished road
Re: Yanmar still overheating

The inside of the heat exchager is probably scaled up or partially plugged.

This is common with auto and truck type radiators.

I have often had radiators that although they would "flow test" adequetly would not shed the heat. I have had no luck with the various chemicals once one was fouled.

The cure is either replace the heat exchanger or get it cleaned (rodded out) professionally.

This assumes no leaks allowing air into the "sealed" part of the system. Or loose belts, stuck thermostats etc.
cruisingdream likes this.
__________________
Seafarer 29 KCB
Reply With Quote Share with Facebook
  #8  
Old 08-12-2013
THEFRENCHA's Avatar
Senior Member
 
Join Date: Jan 2003
Posts: 111
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 12
THEFRENCHA is on a distinguished road
Re: Yanmar still overheating

So now I get it ! Heat exchanger is for coolant only
Is this right?
Reply With Quote Share with Facebook
  #9  
Old 08-12-2013
Mechsmith
 
Join Date: Jun 2009
Location: Almost Heaven West Virginia
Posts: 198
Thanks: 1
Thanked 13 Times in 12 Posts
Rep Power: 6
Mechsmith is on a distinguished road
Re: Yanmar still overheating

Inside portion of heat exchanger carries engine coolant. Water from the world passes over the outside.

Similar to an automobile. Engine coolant inside block and radiator. Air from the world outside.

Cooler should be profesionally cleaned ie "rodded out" or replaced depending on condition.

Rule out. Compression leak "forms bubbles in coolant) Loose water pump drive belt. (coolant won't circulate properly) defective thermostat. Inadequate flow through (raw water system) (bad impeller, collapsed hose etc.

You have two water pumps. One for raw water to circulate through the tank and out the exaust. The other to circulate coolant through the block and the heat exchanger.
__________________
Seafarer 29 KCB
Reply With Quote Share with Facebook
  #10  
Old 08-12-2013
asdf38's Avatar
Senior Member
 
Join Date: Jul 2010
Posts: 676
Thanks: 1
Thanked 4 Times in 4 Posts
Rep Power: 5
asdf38 is on a distinguished road
Re: Yanmar still overheating

Quote:
Originally Posted by THEFRENCHA View Post
So now I get it ! Heat exchanger is for coolant only
Is this right?
The heat exchanger is where heat exchanges between sea water and coolant. So it's got both and it provides a lot of metal surface area for heat to transfer from the coolant to the saltwater while not allowing them to mix. So it's for two
Completely seperate paths, if either one clogs its a problem.

Aww ok I thought it looked like your Irwin.
__________________
1979 Contessa 26
Boston, Ma
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
Yanmar 3GMF Overheating gordofloats Diesel 20 05-23-2012 12:13 PM
Yanmar 1GM10 Overheating BayLAzr Diesel 8 07-29-2011 02:40 PM
Yanmar 2 qm 15 overheating mystery NickAllinson Gear & Maintenance 9 06-26-2011 10:39 PM
Yanmar 3HN35F OVERHEATING kjango Gear & Maintenance 11 05-26-2009 10:29 PM
Yanmar 2GM overheating Northeaster Gear & Maintenance 11 07-18-2007 03:07 PM


All times are GMT -4. The time now is 09:08 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.