2006 Volvo Penta 3.0 GLP-D Impeller problems

[Skyhawk1755]

I replaced the impeller after it blew up on me, there was only one fin left on it and half of another one. I opened up the thermostat housing and removed a few pieces of impeller from there but not enough to equal the fins lost. Later I found a whole fin laying there in the bilge after I got the boat back together. I ran the boat on the flush hose fitting in the driveway and let it run for a while and it never got over 160 on the temp gauge, so I took it to the lake today to run it and was letting it warm all the way up before backing off the trailer to make sure that it wouldn't overheat pumping it's own water instead of being on the house. It got to about 150 or 155 and I noticed some smoke coming off the exhaust manifold so I shut it down. I found a few drops of what appeared to be oil there and that is what was smoking. I didn't think it was supposed to run that hot so I was done for the day. I don't think the thermostat was open yet because the hose going to the circulation pump was warm and didn't feel like it had water in it. Is the exhaust manifold only cooled down after the thermostat is open? If its cooled from the start then where should I start looking for the cause of the heat and is there an alarm for the exhaust that would sound if it got too hot? I have an IR thermometer and could check surface temps on the water hose again. Any help would be greatly appreciated.

 

[Fun Times]

Re: 2006 Volvo Penta 3.0 GLP-D Impeller problems

You may have a blockage in the riser kind of like this guy did. So check for this as well, Good luck. http://forums.iboats.com/volvo-pent...urts-coolant-hose-2nd-time-season-203607.html

 

[Skyhawk1755]

Re: 2006 Volvo Penta 3.0 GLP-D Impeller problems

You may have a blockage in the riser kind of like this guy did. So check for this as well, Good luck. http://forums.iboats.com/volvo-pent...urts-coolant-hose-2nd-time-season-203607.html

That guy is having pressure issues. My boat seems to be running fine but the manifold seemed to get hotter than it should have but didn't sound an alarm and the temp gauge was showing 150 to 155. The question I guess is would it sound an alarm if the manifold was overheating and how hot should it get? I thought that the manifold would run fairly cool and not hot enough to burn oil off the top of it.

 

[Skyhawk1755]

Re: 2006 Volvo Penta 3.0 GLP-D Impeller problems

I Think I got it. The impeller housing was leaking a little due to me not using proper torx, I think it was sucking air. I will take it out next weekend and make sure.

 

[skydiveD30571]

Re: 2006 Volvo Penta 3.0 GLP-D Impeller problems

The exhaust is always water cooled, regardless of thermometer position. With no water, it doesn't take long for hot exhaust gas to burn up the rubber bellows connecting the elbow to the y-pipe. Your engine has exhaust temp switches on the rear of each elbow, before the exhaust pipe travels down the back of the engine. It is a brass insert with a beige/black wire coming off it. They are a simple switch designed to trip at a certain temp. You can begin having an exhaust overheat before that sensor is tripped.

The small hose traveling from the thermostat to the exhaust manifold is a common place to get plugged up, especially with dirt or something bigger like impeller pieces that managed to travel through the engine block. A blockage like this is usually evident when engine block temperature remains normal but 1 exhaust side gets much hotter than normal. Just to be sure, pull that hose off and make sure the hose, t-stat housing outlet, and manifold inlet are all clear of any obstructions.

 

[Skyhawk1755]

Re: 2006 Volvo Penta 3.0 GLP-D Impeller problems

When I first put the impeller in I didn't remove the hose from the thermostat housing to the manifold because there was a crimp on hose clamp on the manifold side of the hose and didn't want to undo that without a way to replace it. I did take it off after I found that leak coming from the impeller housing and it was clear, I replaced the crimp on hose clamp with a normal one. I never let it get very hot because I thought it was supposed to be cool. Is the bellows # 21 and the Y pipe # 22 on this parts list? Intake And Exhaust Manifold 3.0GLP-D - 7744800 - Volvo Penta I want to make sure I am on the same page and didn't burn something else up that I didn't know about.

 

[skydiveD30571]

Re: 2006 Volvo Penta 3.0 GLP-D Impeller problems

My fault, somehow I missed the "3.0" in the title. I understand you have 1 manifold and riser, my apologies.

Yes, the rubber bellows is part #21 and is usually affected by exhaust overheats. If you see no leaking water, you are probably fine. Part #19 is the temperature switch that I mentioned.

It sounds like you caught the problem before anything happened. Next time out I'd just keep an eye on the water pump to make sure you fixed the leak, and keep an eye on that exhaust temp for a few minutes after startup (you'll just have to feel the exhaust elbow, it shouldn't get too hot to touch.

 

[Skyhawk1755]

Re: 2006 Volvo Penta 3.0 GLP-D Impeller problems

I ran it on the hose through the flush connection and after 15 to 20 minutes I could lay my hand on the manifold and it appears to be good now. It is my understanding that it works a little different using the flush port and will keep an eye on it saturday when it will have to pump it's own water.