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  #1  
Old 06-01-2012, 05:37 PM
Justin D.'s Avatar
Justin D. Justin D. is offline
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Ilmor 5.7 Temperature Problems

Over Memorial Weekend I took my new X-15 to Lake Powell. When idling out of the marina my engine temperature started to climb up to 190-200 degrees. I quickly got the boat up to cruising speed and the temperature fell back down to 160. After another 5 minutes of cruising the engine temperature fell down to 120-130 degrees. So I took the boat down to an idle only to have the engine heat up to 190-200 again. I had no alarm when my engine temperature hit 200 and I noticed no performance issues with the engine. Any thoughts?
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  #2  
Old 06-01-2012, 06:18 PM
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ricford ricford is offline
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Check the strainer for blockage. Check impeller, even "new" ones can go bad if it's been sitting for a while. Check for water leaks around the engine.
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  #3  
Old 06-02-2012, 01:51 AM
Justin D.'s Avatar
Justin D. Justin D. is offline
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Would a bad impeller explain the engine temp dropping to 120 at cruising speeds as well? Im thinking it could just be a faulty thermostat?
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  #4  
Old 06-02-2012, 11:09 AM
JimmyDean JimmyDean is offline
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I had the same exact problem. It was an airlock in the filter basket. The dealer bypassed the basket and it seems to be working fine.
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  #5  
Old 06-02-2012, 11:31 AM
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Justin D. Justin D. is offline
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Is bypassing the strainer something i can do by myself? Or do I have to take it in to a Mastercraft dealership
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  #6  
Old 06-02-2012, 11:45 AM
JimmyDean JimmyDean is offline
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I think so. I had a friend do it and he used the shorter hose when he bypassed the strainer.
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  #7  
Old 06-02-2012, 11:53 AM
JimmyDean JimmyDean is offline
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I would still talk to the dealer. I have gotten mixed messages regarding this problem.
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  #8  
Old 06-02-2012, 12:26 PM
Justin D.'s Avatar
Justin D. Justin D. is offline
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Ill talk to my dealer about it. My boat is stored 6 hours away from the nearest Mastercraft Dealership so I really want to avoid hauling it all the way over there!
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  #9  
Old 06-03-2012, 04:14 PM
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X25 ED X25 ED is offline
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Quote:
Originally Posted by Justin D. View Post
Over Memorial Weekend I took my new X-15 to Lake Powell. When idling out of the marina my engine temperature started to climb up to 190-200 degrees. I quickly got the boat up to cruising speed and the temperature fell back down to 160. After another 5 minutes of cruising the engine temperature fell down to 120-130 degrees. So I took the boat down to an idle only to have the engine heat up to 190-200 again. I had no alarm when my engine temperature hit 200 and I noticed no performance issues with the engine. Any thoughts?
I assume you have a 2102 model? Then check the circulation pump, mine was broken and is replaced 2 weeks ago
good luck
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  #10  
Old 06-03-2012, 07:38 PM
Justin D.'s Avatar
Justin D. Justin D. is offline
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Did you replace the pump yourself or did you have your dealer do it?
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