Cooling problem 2001 volvo 5.0

[Bekro]

I replaced the impeller by a new one on my volvo 5.0 carb 2001. Difficult to find the proper prop because there're two models (even for volo penta company to find out!) Finaly changed with the proper one but now the engine is cooling down at high speed. I've checked the thermostat (although it seems you can't get it out of the housing any sugestions?) and seems to be working. Are there any other option where I need to look at. When the engine runs at iddle speed the temp raise up to 120....higher speed it drops down to 100<br /><br />Thanks

 

[Don S]

Re: Cooling problem 2001 volvo 5.0

That's way to cold, it should be up around 160°-175° time to replace the thermostat. How did you "Check" the thermostat, if you couldn't remove it???<br />What's the model number of your engine?<br /><br />Here is the thermostat check from the 2001 service manual word for word.<br /><br />A 160° F (71° C) thermostat is standard.<br />Inspection Procedure: Check for proper rating and style, corrosion,<br />restricted movement, or broken spring.<br />Test Procedure - Immerse the thermostat and a thermometer in a<br />container of water. Heat water. Thermostat should start to open<br />between 157-163° F (70-73° C), and should open to 5/32 in. (3,96 mm)<br />minimum (A) at 182° F (83° C).<br />Repair Procedure: None, replace unit.<br /><br />Just checked the 00 and the 01 manuals, same thermostat housing. I am assuming you have raw water cooling. Here is how to access the stat.<br /><br />

 

[Bekro]

Re: Cooling problem 2001 volvo 5.0

Many thanks Don, yesterday I removed the thermostat from the housing and it seems to be this is working properly. The only think I can think of when the engine remains to cold must be the thermostat so I will replaced it to be secure. Are there other things which could be the source of this I didn't think of?

 

[garycinn]

Re: Cooling problem 2001 volvo 5.0

Do you have the Volvo o-ring installed properly? That was the case on my Merc.

 

[Bekro]

Re: Cooling problem 2001 volvo 5.0

Thanks Gary but the problem occurs after I replaced the impeller so nothing was changed on the thermostat that moment, when I removed the thermostat out of the housing the ring was in the correct position.

 

[Don S]

Re: Cooling problem 2001 volvo 5.0

I removed the thermostat from the housing and it seems to be this is working properly.

Did you actually put it in water and see what temp it started opening at? Or did you put it in some 160° water and it opened. Just changing the impeller will not cause an engine to run cold. The thermostat opening too early or sticking open will cause it to run cold.<br />Best bet would be just to replace the thermostat with the proper OEM stat. The Volvo part number is 3587597 and lists for only #15.

 

[Bekro]

Re: Cooling problem 2001 volvo 5.0

Don just ordered a new one just to be sure, the dealer had another suggestion it might be there will be air in the thermostat house (which there wasn't with the old impellor)during higher speed.<br />By the way I live in the Netherlands just the thermostat is $40 without ring and gasket!!<br />Note I checked the thermostat from close to open...<br />Hope I'll be able to test because overhere the summer is already over again.

 

[pemar.s]

Re: Cooling problem 2001 volvo 5.0

Forgot the topic already but finnaly able to check the new thermostat.....still the same problem temperature drops at higher speed.

 

[Don S]

Re: Cooling problem 2001 volvo 5.0

Pemar.s. Are you and Bekro one and the same person????? <br /><br />Is this a raw water cooled engine?<br /><br />When you are talking temps, are you giving temps in C° or F°. That alone could make this an overheat or overcooling problem if we aren't talking in the same format.

 

[pemar.s]

Re: Cooling problem 2001 volvo 5.0

Yes the same person, don't ask me how this is possible allready send a mail to iboat.<br />I will talk temp F from now on. During slow speed the temp raise up to appr 160 F. But at higher speed it drops down to 100 F. This is raw water cooling. And as mentioned impellor and thermostat are replaced by new ones. And the temp gauge seems to work properly because this indicates the 160 at slow speed and drops down...

 

[paulie0735]

Re: Cooling problem 2001 volvo 5.0

Don, this sounds to me like the plumbing has been routed incorrectly. The only time I have seen this happen is when somebody has replaced the hoses and put them back on wrong! I’m betting he’s done something wrong when hooking the hoses back up. Could be very easy to do on an engine 6 years old, who knows what kind of misfit hoses and fitting have found there way onto this over that time.

 

[Don S]

Re: Cooling problem 2001 volvo 5.0

What is the temperature of the water you are boating in? <br />Other than the thermostat sticking open or being installed improperly, or being the wrong one, I know of no reason for it to cool too much.<br />Do you have the serial number for your engine? I know you say you have a 2001, but it may be a 2001 boat, but the engine could be 2000.<br />Paulie, if you reverse the hoses on the raw water pump, it will not pump water at all, and will burn up the impeller in short order. (Don't ask how I know that).<br />The system is pretty straight forward, not much to cause over cooling.<br /><br />

 

[paulie0735]

Re: Cooling problem 2001 volvo 5.0

Seems its only started since he worked on it, that’s what made me think he has put it back together wrong, but yeah looking at the diagram its hard to see how you could get it wrong, but something is a miss, that or the sender is faulty or the sender is being starved of water or only getting aerated water at the high rpm and that’s bring the reading down... bit like some temp gauges not reading hot when the engine has no water in it at all! Certainly is an odd one.

 

[mcleaves]

Re: Cooling problem 2001 volvo 5.0

Originally posted by paulie0735:<br />... that or the sender is faulty or the sender is being starved of water or only getting aerated water at the high rpm and that’s bring the reading down...<br />

I like this possbility. What are the riser temps like when you read 100 degrees vs. when it reads 160?<br /><br />If I have it right, at 100 degrees the therm SHOULD be closed and nothing but raw water should be passing through your risers and therefore be cooler thank 160.<br /><br />Regardless though, they should be cool or warm to the touch at all times. If they are HOT when temp is low then you must have air in there and it's just not reading properly.<br /><br />M

 

[pemar.s]

Re: Cooling problem 2001 volvo 5.0

Thanks for all your feedback guys!<br />Checked the hose connections again (with the dawing)but it is almost impossible to make the wrong connection and this is correct.<br />Don asked me the engine nr 5.0 GL PEFS 3869056<br />Everything replaced is origonal volvo penta, the outboard (fresh) water temp is appr 50-55 F (it's the Netherlands)<br />The riser temp are not hot so that's why I have the feeling the temp indication is correct. I will do some testing again when the time and the weather allows me to go boating, hope some one comes up with a good idea in the meantime