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,GT 40 Over Heating |
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Bakchose 
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Joined: November-04-2004 Location: Boston, MA Status: Offline Points: 554 |
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 Topic: ,GT 40 Over HeatingPosted: June-09-2021 at 8:39pm |
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So the 2000 Sport Nautique got put in this past Saturday. Ran it up the lake about 5 miles-ish.. ran better than great tied it up, ran up the 85 steps to get my dog first mate Maggie, got back to the boat and the check engine light was on and the temp was at 220. Turned it off. Ran to the old Necc. Got an impeller. Next day I installed the new impeller. The old one was good. Started the boat. The raw water stainer was bone dry. Checked the intake it's not blocked. One would think I need a new water pump. Could it be anything else? Stupid question. If I run it down the lake would there be enough water pushing though the system to get it to the boat ramp. Mostlikely not but I'd thought I'd ask.
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Gary S
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Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Posted: June-09-2021 at 10:25pm |
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Sounds like an air leak on the suction side of the pump John.Could be any hose clamp or even the strainer and its gasket assuming that after you removed the pump to change the impeller you put it back the right way. Are your hoses as old as the boat too? Awhile back I had a similar problem first start of the year. Took everything apart to check found nothing,put it back together and it worked fine.
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MrMcD
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Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3776 |
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Posted: June-10-2021 at 1:53am |
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I had a strainer gasket leak, mine worked fine above idle but heated up quick at idle. New gasket/Oring fixed it up.
Maybe some leaves are blocking your pick up under the boat.
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Bakchose
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Joined: November-04-2004 Location: Boston, MA Status: Offline Points: 554 |
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Posted: June-10-2021 at 8:00am |
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I checked the intake. Wasn't blocked at the hull. I'll check the seal on the strainer. You can install the impeller backwards? The old one is in good shape so the impeller wasn't the issue. I will reinstall it. Hopefully I can get out of work on time and work on the boat.
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: June-10-2021 at 8:08am |
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John,
If the impeller was installed backwards, it will lflip around in a few revolutions.
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11184 |
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Posted: June-10-2021 at 8:34am |
Gary is wondering if you put the pump in backwards (AKA upside down), not whether the impeller is in backwards.  If it's upside down, the suction hose is hooked to the discharge and the discharge to the suction and no pumping takes place. That wouldn't explain your initial problem since it ran fine and cooled with the boat at speed, but if you replaced the impeller and then put the pump in upside down, that might explain your lack of any flow now. It sounds like you have one of the suction side issues already mentioned that caused the low/maybe no flow at idle originally. Your pump should be installed with the head of the cam screw facing in towards the engine.  |
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Bakchose
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Joined: November-04-2004 Location: Boston, MA Status: Offline Points: 554 |
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Posted: June-10-2021 at 8:48am |
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The pump is installed correctly. I'm suspecting it's the strainer. It was very easy to unscrew and the zip tie holding it in place is broken.
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samudj01
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Joined: March-10-2009 Location: NC Status: Offline Points: 982 |
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Posted: June-10-2021 at 9:40am |
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Also check your belt on the pump that it is not loose. Had that issue before
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78 Ski Tique, 72 Skier w/302's, 93 SN w/351 & 17 GS22 w/zr409
Previous - 99 Sport Nautique w/GT40 and 87 Martinique w/351 |
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Gary S wrote: