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| Author: | su2skelsey [ Tue Jun 16, 2009 11:21 am ] |
| Post subject: | overheating |
I have a 2004 268 Vista, VP with 5.7 Gi engine. Last year was the first year I had the boat and she ran without any issues. This year when I splashed her she ran fine at idle, then the first time I throttled her up she overheated. So I thought impellor. I looked at the impellor and it looked okay. I would have replaced it, but the service center where I bought the part sold me the wrong one. Since the impellor looked okay, I though it might be the thermostat. I replaced the thermostat and after some issue with new thermostat... I replaced that as well. So now at idle the boat temperature is fine, as soon as I throttle it up in overheats... I throttle it back down and the temp drops. After reading a couple thread it appears that I should probably go ahead and replace the impellor and take the piece out of the equation, even though it looks brand new. Another question I have is could there be a blockage somewhere or a kink in the hose... Is there some typical place where the hose might kink on these engines. Water is definitely coming in and going out... just not at throttle. Any idea's would be appreciated... Scott |
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| Author: | captkevin [ Tue Jun 16, 2009 11:55 am ] |
| Post subject: | Re: overheating |
Replace the impeller - can't always tell by looking at it if they are good or bad. |
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| Author: | Cap'n Morgan [ Tue Jun 16, 2009 11:59 am ] |
| Post subject: | Re: overheating |
Are your risers hotter than normal? One side hotter than the other? What is the temp reading when you say "it overheats" ? |
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| Author: | su2skelsey [ Tue Jun 16, 2009 12:01 pm ] |
| Post subject: | Re: overheating |
i did get the right one... so i will replace it on thursday and try to get this thing working before the weekend. |
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| Author: | pet575 [ Tue Jun 16, 2009 2:13 pm ] |
| Post subject: | Re: overheating |
This doesn't sound like an impeller to me. It sounds like either a faulty thermostat (I realize you just replaced it) or some type of blockage in the system. Usually you cool down at higher speeds when the impeller is bad and heat up at lower speeds. This would appear to the be the opposite. |
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| Author: | Graham R [ Tue Jun 16, 2009 2:25 pm ] |
| Post subject: | Re: overheating |
Someone reported a similar issue recently; turned out to be the impellor, the rubber part had debonded from the metal insert that locates on the pump shaft. At low engine speeds, it was OK, pumping enough water. But as RPM built up, the rubber part of the impellor was slipping on the metal insert, so it wasn't pumping enough water. Graham |
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| Author: | pet575 [ Tue Jun 16, 2009 3:47 pm ] |
| Post subject: | Re: overheating |
Heard a similar story with a warning that it was an after-market manufacturer's impeller. Guess that could be a possibility... |
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| Author: | captkevin [ Tue Jun 16, 2009 4:24 pm ] |
| Post subject: | Re: overheating |
Do you boat in salt water? Didn't even consider that - guess if you do risers are a consideration - |
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| Author: | bkfw190 [ Tue Jun 16, 2009 5:23 pm ] |
| Post subject: | Re: overheating |
man- sounds like the same thing i'm going thru right now! a have a 1995 5.0 fl that was running a perfect 160 deg. on shore with the garden hose and again on the water as long as i'm going under 25 mph and 2500 rpm's. my first ride out was a rough water ride so i didn't run into this problem until i got to open it up the following time out then- next thing i knew, the temp was sky high!!! the temp went down as soon as i brought the speed back down. both risers were extremely hot to the touch but the raw water hose to the therm. housing was cool! i told this to the local mechanic that suggested that i disconnect the hoses at the pump and housings and backflush the lines. as soon as i did this, i flushed out dozens of yellow jacket bees from the outdrive water intake!! i thought that this was it so i put everything back together only to have the same problem. my next step is/was removing the theromostat and running it that way (which i did today). so far, i have gone longer distances with a max temp. of 150 or so but because of water conditions, i couldn't give it the ultimate test-yet! all i can say is- glad i bought extra thermostat gaskets and made a copy of it to cut out more gaskets for future tests. ( oh yah- i replaced the impeller and thermostat earlier this spring) |
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| Author: | Aussie_Horizon_190 [ Tue Jun 16, 2009 7:55 pm ] |
| Post subject: | Re: overheating |
Wondering if it is the regular circulating water pump on the front of the motor... but the impellor blades inside this are meant to be stainless steel so should not be a problem for many, many years. |
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| Author: | robbo3 [ Tue Jun 16, 2009 8:12 pm ] |
| Post subject: | Re: overheating |
I had a new Volvo impeller put in last year that was shot at the end of summer. We're trying a Jabsco one this year. |
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| Author: | su2skelsey [ Tue Jun 16, 2009 8:49 pm ] |
| Post subject: | Re: overheating |
I am not in salt water... the risers were hot to the touch... when i hit 200 degrees i shut everything down... I guess i could try to back flush... and put in the new impellor...and look for kinks in the lines.... It was working fine when at the end of last year... now at the beginning of this year... I am having issues. I am just wondering if I did something stupid when I winterized the boat... There is no leaking from any parts... I do have to replace the gasket on the thermostat housing they don't last long at all. I even took the thermostat out and ran it without a thermostat.. to see if it was a bad thermostat... It turns out it was a bad thermostat... with the thermostat in it started to overheat after are 15 minutes at idle. Now I am over that issue and it only overheats when I throttle up... I am working on this on Thursday... I'll let you know what I find out if anything... Thanks, Scott |
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| Author: | Aussie_Horizon_190 [ Tue Jun 16, 2009 10:20 pm ] |
| Post subject: | Re: overheating |
hmmmm... still sounding like the circulating pump to me. The external raw water pump is shifting enough water for low revs, but can't move enough at higher revs which indicates again the circulating pump as a potential problem. As it is not used in salt water, I am wondering if the circulating pump may be blocked by sand or weed or something..? The outlets if the circulating pump where it bolts to the front of the block are pretty small (approx 1") and one 3/8". About the weirdest thing I ever saw on a circulating pump was the impellor completely corroded away - the shaft span around fine, but it never moved any water - looked perfect until I opened it up! Wondering if it is something weird like this... either way, would remove the circulating pump, open it up, clean and check. You can get a gasket set or rebuild kit from NAPA easy enough - only costs a few bucks and not a big job. |
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| Author: | Graham R [ Wed Jun 17, 2009 7:08 am ] |
| Post subject: | Re: overheating |
If the manifolds/ risers were hot to the touch (as well as the motor overheating), doesn't it point to the raw water pump not pumping enough water? On the raw water cooled engines (if I remember right) the raw water goes from the raw water pump to the top of the thermostat housing, the manifolds being fed with raw water directly from there. Otherwise the manifolds would not get any cooling water until the thermostat opened. When the thermostat open, it starts to pass some of the raw water through the engine. A restriction in the circulating pump ( or thermostat) would only affect how much water passes through the engine, not through the manifolds. The outlets for the manifolds in the thermostat housing can get pretty blocked up with rust (as I found after 1 season in salt water, when I changed to FWC). Graham |
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| Author: | su2skelsey [ Wed Jun 17, 2009 8:55 am ] |
| Post subject: | Re: overheating |
i am wondering now, if i didn't switch the hose to the water pump when i winertized it... is that possible.. could the engine even run? i am just trying to figure this out? |
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