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I really need some help with Volvo Penta MD2003 overheat.


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#1 Sea Scouter

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Posted 30 September 2013 - 12:33 PM

MD2003, fresh water (closed system)

Tendency to overheat at idle or low R's after about 15 minutes, might not overheat when running >2000 rpm

 

I thought I was handy when...

I flushed the freshwater system... removed gel jizz out of bottom block drain. Flushed 3 times until clear. Refilled with the silicate free stuff.

Nope

R & R heat exchanger with boil out at the hot rod shop

Nope

Changed thermostat

Nope

Ran without thermostat

Nope

Rebuilt fresh water coolant pump. Might have had an air leak

Nope

Flushed again.

Nope

 

PLENTY of raw sea water flow. Engine runs just about as it always has.

 

I need some ideas.

Thank you in advance.

 



#2 Trov„o

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Posted 30 September 2013 - 02:22 PM

water pump rotor?



#3 A_guy_in_the_Chesapeake

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Posted 30 September 2013 - 03:09 PM

If the water pump is working and there are no blockages, ( as evidenced by your mention of raw water flow), my next step would be to look for symptoms of a blown head gasket. 



#4 Sea Scouter

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Posted 01 October 2013 - 01:57 AM

I'm likin' the head gasket...

No evidence of juice in the exhaust but I'll check for bubbling in the reservoir.

It's not a terrible job to pull the head.

Thanks



#5 Babel fish

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Posted 01 October 2013 - 10:08 AM

I have had the same motor in my previous boat, we inspected the boat prior to buying.....the owner did a great job of hiding the motor over heat problem.
So.....on the short trip to deliver the boat we had an cloud of steam.....not your same problem but the solution may intrest you.

The mechanic talked me through some of the problems .
The water pump rotor would break down every time the motor was run, eventually not pumping water....check this, replace and observe, feel water temp out of exhaust.
The head in my boat was corroded , he even told me about not using different coolants and that the coolant should be changed out every 24 months.
.....I had to replace the head, and lots of the rubber seals.
I found a site that had some good info....google the problem using the motor name and brand......find a good mechanic.

After the fix, the motor ran like a charm and served us well. Hope this helps

#6 lydia

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Posted 01 October 2013 - 10:40 AM

Wrong impellor fitted probarly the fresh water one.
Only explains overheat with little water circulating at low revs.
look for obstruction but not blockage in fresh water system otherwise

#7 Sea Scouter

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Posted 01 October 2013 - 02:57 PM

A few clarifications...

 

Really two systems, right? Fresh water is really the closed coolant system runing the ethylene glycol stuff. The orther system is the raw water system pumping cool water from the big lake.

 

The closed side pump was inspected and the impeller was in good shape and the 'shells regasketed and sealed with RTV. It's a big inpeller... larger than an automotive type. It is original from 1986.

The raw water impeller has been replaced. PLENTY of water coming out of exhaust.

 

Boat has been in fresh water for it's entire lifetime. I dd notice some silica goo on my first flushing.



#8 Babel fish

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Posted 01 October 2013 - 10:53 PM

Sounds like you have had fun.....did you do the google thing, you will find your problem in various forms is covered ....have alook.

Did you put the heat exchanger back properly with the right gaskets and make sure it was aligned, did you check the exhaust fitting on the engine.

Find a mechanic......a good one

#9 Mr. Fixit's brother,, Mr. Fixit

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Posted 01 October 2013 - 10:59 PM

Check all your hoses on the raw water side making sure the inner wall is intact and not collapsing at low rpm/pressure.

#10 NoStrings

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Posted 02 October 2013 - 05:53 AM

MD2003, fresh water (closed system)
Tendency to overheat at idle or low R's after about 15 minutes, might not overheat when running >2000 rpm
 
I thought I was handy when...
I flushed the freshwater system... removed gel jizz out of bottom block drain. Flushed 3 times until clear. Refilled with the silicate free stuff.
Nope
R & R heat exchanger with boil out at the hot rod shop
Nope
Changed thermostat
Nope
Ran without thermostat
Nope
Rebuilt fresh water coolant pump. Might have had an air leak
Nope
Flushed again.
Nope
 
PLENTY of raw sea water flow. Engine runs just about as it always has.
 
I need some ideas.
Thank you in advance.
 


I did all of that, then pulled off the exchanger housing/exhaust manifold. There was a clot of corrosion immediately behind, or in front of the thermostat. You couldn't see it with the coolant pump removed. The clue was using an IR heat gun. The exchanger was running at sea water temp because coolant couldn't circulate through the exchanger, yet the head temp was 215.

#11 olaf hart

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Posted 02 October 2013 - 12:34 PM

Had the same problem on a saltwater raw water cooled 2003.

 

There was a plug of scale blocking every one of the connections between the coolant pipes and the engine.

 

May not be an issue on a FWC motor, but I suspect there is a lot of turbulence in those joints between the copper pipes and the block, the ones with the crappy half moon clamps.

 

Was easy enough to take them apart and clean them, there was no scale to speak of inside the block and head.



#12 cold water sailor

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Posted 03 October 2013 - 11:39 PM

check your hose routing

 

A friend of mine bought a used boat this  spring that the previous owner had over heating problems over the years.    He even installed  a larger  heat ex changer.

 

Somewhere along the years the hoses containg  antifreeze got  re routed and zip tied  to the  overhead above  the  engine.  Made for  a tidier look in the  engine  room   but it put a air bubble in the line  that got sucked into the  centrifical water pump. Well centrifical  pumps  don't work well  with air and  it stopped circulating when the  air bubble  got in the  pump.  Previous owner  made system  work  by adding  extra  hose to the filler and adding  antfreeze from  two feet above  which was  enough to make  the air bubble pass..  Any ways new  owner rerouted hoses to normal elevations  and all is working fine    and no need  to prime  from up high.  Check the routeing of the hoses   they need to be  at the right  level to prevent an  air lock///



#13 Black Dog

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Posted 05 October 2013 - 08:53 PM

What is telling you have high temps? Maybe you have a bad gauge or sending unit.

Get a IR gun and check the temp that way.



#14 Babel fish

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Posted 05 October 2013 - 11:13 PM

So..have any of the suggestions worked, Where are you Sea Scouter ?

#15 Sea Scouter

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Posted 10 October 2013 - 03:54 AM

I was on vacation, and now I'm back.

Next stop will be the IR gun and find out what is really running hot.

To all those who suggested checking the goofy rubber washer gasket connector things, yes, those have ALL been replaced. Do you know that Volvo gets 4 or 5 bucks for those little square rubber washers?

At that time I also poked around in those passages in the block. Best I can tell you is that that the block appears to be more clean than some the of pots and pans in my kitchen.

I think I will also pull the temperature sending unit and test. Don't know how yet but the googles might have some spec for R when sending unit is hot vs. cold. And yes, I have googled the hell out of this problem.



#16 sailSAK

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Posted 10 October 2013 - 02:39 PM

What is telling you have high temps? Maybe you have a bad gauge or sending unit.

Get a IR gun and check the temp that way.

 

VP has a temperature alarm and a sending unit on engines with the "delux" instrument panel.  Are you getting both a buzzer and a high reading?  I think the factory sender is 10-180 ohm if memory serves.  I swapped my original VDO  gauges out for Teleflex.  Had to change the oil pressure sender but the temp one was the same.



#17 Babel fish

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Posted 10 October 2013 - 10:49 PM

What is telling you have high temps? Maybe you have a bad gauge or sending unit.
Get a IR gun and check the temp that way.

 
VP has a temperature alarm and a sending unit on engines with the "delux" instrument panel.  Are you getting both a buzzer and a high reading?  I think the factory sender is 10-180 ohm if memory serves.  I swapped my original VDO  gauges out for Teleflex.  Had to change the oil pressure sender but the temp one was the same.

My thoughts as well......is there steam !!.....if not how do you know it's hot ??

#18 NoStrings

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Posted 11 October 2013 - 06:44 AM

Check the head temps with the IR gun. If its hot, trust it. Pull off the manifold/ heat exchanger body and flush it.

#19 Sea Scouter

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Posted 02 November 2013 - 05:30 PM

Ran the IR gun and had to stare at the cooling system schema for a while. Here's what... Coolant n3ever really makes it back to the heat exchanger. A decade ago I had a leaky hot water heater and pulled it. In anticipation of replacement I ran a hairpin of 1/2" radiator hose up to the port settee. So, from the coolant pump, to the setee and back to the pump is the first route of the hot coolant. Except it was trapped in a kink and not returning to the pump for it's trip to the heat exchanger.

Thanks to all and the IR gun is also good on cats!



#20 Sea Scouter

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Posted 02 November 2013 - 11:51 PM

Turns out that I already shortened the hairpin maybe a few years ago. So that's not it. Shit.



#21 Mr. Fixit's brother,, Mr. Fixit

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Posted 03 November 2013 - 02:15 PM

If you haven't done this yet you need to inspect/replace any multi-ply cord reinforced hose in the system.  The inner wall can collapse causing a flow restriction at low rpm//pump pressure. As rpm increases it opens back up.  This problem baffled me once to the point I couldn't in good conscience charge the man the amount of time I spent scratching my noodle.



#22 sailSAK

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Posted 03 November 2013 - 05:17 PM

10142.jpg

 

Start taking it apart.  Thermostat first, hoses (there aren't many rubber ones here anyway), heat exchanger and then waterpump.  I recall hearing somewhere that the aluminum impeller in the waterpump used on these can crumble apart after years (electrolysis or something?)



#23 Mr. Fixit's brother,, Mr. Fixit

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Posted 03 November 2013 - 08:32 PM

No not many hoses except OP also has a run going to a future water heater. And there's still the raw water side.

 

10142.jpg

 

Start taking it apart.  Thermostat first, hoses (there aren't many rubber ones here anyway), heat exchanger and then waterpump.  I recall hearing somewhere that the aluminum impeller in the waterpump used on these can crumble apart after years (electrolysis or something?)



#24 sailSAK

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Posted 04 November 2013 - 02:16 AM

No not many hoses except OP also has a run going to a future water heater. And there's still the raw water side.

 

If it is plumbed properly this should not matter.  Line should run from the water pump (Part #8 on the diagram) to a plug on the cylinder head near the thermostat.  Flow can be on or off, and the cooling circuit will function the same.  I ran a hydronic cabin heater for years like this off my engine with a ball valve inline to adjust heat output.  The engine didn't care if the heater was full on or off. 



#25 Ishmael

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Posted 04 November 2013 - 04:23 AM

It's an easy fix. Take the raw water hose, and plumb it to the raw water pump on a Yanmar. When the Yanmar is finished with it, you can run it through your Volvo and it will keep it warm.

 

You're welcome.



#26 Sea Scouter

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Posted 05 November 2013 - 03:11 PM

The Yanmar is the best suggestion yet. God has a Yanmar in his old yawl.

On a more serious note, I'm going to block off the hose at '8' where the hairpin is presently.






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