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Boat running hot at idle

Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=33700
Printed Date: October-08-2024 at 12:42pm


Topic: Boat running hot at idle
Posted By: marmon77
Subject: Boat running hot at idle
Date Posted: May-28-2014 at 1:06pm
1988 Ski Nautique 2001 is running hot at idle but not when I'm underway. I've replaced the impellar made sure it was installed the corect way, tightened all the hoses. Like stated I can run the boat, pull kids but 30 seconds or so after idleing the temp shoots up and I have to shut the boat off. Any ideas? Thanks



Replies:
Posted By: Hollywood
Date Posted: May-28-2014 at 1:47pm
If all the hoses are good and tight as you say then check the strainer is not loose, cracked or has a bad/missing gasket. You are getting air from somewhere, start over. Trans cooler fittings in good shape?

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Posted By: backfoot100
Date Posted: May-28-2014 at 2:06pm
Originally posted by Hollywood Hollywood wrote:

If all the hoses are good and tight as you say then check the strainer is not loose, cracked or has a bad/missing gasket. You are getting air from somewhere, start over. Trans cooler fittings in good shape?


+1 on what Kevin says.
Also may have a leak in the RWP shaft seal.

Disconnect the inlet hose to the RWP from the cooler and do the bucket test. If it cools at idle then you know the RWP and the hose hooked to it is good. Then you know you have an issue somewhere between the cooler and the hull fitting.

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When people run down to the lake to see what's making that noise, you've succeeded.



Eddie


Posted By: marmon77
Date Posted: May-28-2014 at 2:26pm
Thanks guys I'll check the trans hoses and then do the bucket test. Could the RWP be the problem? Even with the new impellar, could the tolerences internally be such that it's not "feeding" the engine at idle?


Posted By: Hollywood
Date Posted: May-28-2014 at 3:47pm
If that were the case it would overheat at high speed.

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