2001 Air Nautique GT40 351 is overheating at idle?
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Boat Maintenance
Forum Discription: Discuss maintenance of your Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=26013
Printed Date: November-19-2024 at 2:28am
Topic: 2001 Air Nautique GT40 351 is overheating at idle?
Posted By: mjm103092
Subject: 2001 Air Nautique GT40 351 is overheating at idle?
Date Posted: May-17-2012 at 2:49am
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PLEASE HELP!!!!!!!! I have a 2001 351 GT40 and it is overheating at idle. There is a crack on the bottom of the exhaust manifold, due to a winter freeze! Will this cause a pressure issue due to air getting in at the manifold. This boat has a RAW WATER PUMP SYSTEM. It only overheats at idle about 200 degrees. Now when I am moving it stays around 160 degrees. I put a new impeller in it and I think the T-stat is good. THANKS ------------- Matt Moore |
Replies:
Posted By: 8122pbrainard
Date Posted: May-17-2012 at 8:47am
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Matt, The crack in the manifold will not cause the overheat. The water flow is going the other way and is exiting the engine at that point. Check all your hoses at every connection and tighten the hose clamps with a socket wrench. Check your strainer and make sure it's seal is good. Unlike a auto engine, the marine with a raw water system is not pressurized. There's just enough pressure from the RWP to get the water through the system. Sorry to hear about the crack. Post a picture - it may be repairable by brazing or you will need a new one. Some have even had good luck with epoxy. If repaired, the manifold should be pressure checked to make sure the wall between the water jacket and the exhaust cavity isn't cracked as well. No winterization or was there water still in the manifold? Welcome to CCfan. Our usual question is, we what pictures!  Also if you haven't already, make a diary submission.------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: ultrarunner
Date Posted: May-17-2012 at 11:58pm
| Pull the T-stat out and run it, that'll quickly troubleshoot that component. |