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getting hot when shut off |
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The Dude 
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Joined: October-19-2004 Location: Houston Status: Offline Points: 1334 |
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 Topic: getting hot when shut offPosted: March-16-2017 at 11:57pm |
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Greetings:
I replaced the manifolds and risers last fall and didn't notice this problem right away but the last few times I've been out I've noticed the temp really rises when I shut the engine off . For instance, after pulling a skier on Tuesday, I shut the engine off to get the skier in the boat. When I turned the key back on the temp is up at about 210. It's running about 160 the rest of the time (whether under load or idling). Is this something I should be worried about? Any ideas? |
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Mullet Free since 93
95 Sport |
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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: March-17-2017 at 12:49am |
No. |
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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: March-17-2017 at 1:44am |
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I think the better question would be did it do this before you replaced the manifolds? Are they pcm's or aftermarket?
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MrMcD
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Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3735 |
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Posted: March-17-2017 at 4:52am |
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I have had two 351W powered Nautiques and they always will climb in temp a little after a hard run, 40 MPH barefoot runs really do this if you shut down quickly but I have never seen 210. Maybe 180-190 but never 200+.
I had a Malibu between the Nautiques and it ran the 350 Chevy, it did the same thing after hard runs, 160-180 but never 200+. I'm curious what others have had for experience. |
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2001SAN
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Joined: June-26-2012 Location: Ireland Status: Offline Points: 244 |
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Posted: March-17-2017 at 5:08am |
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My GT40 never climbs above 160. We normally cruise around 30 or at wakeboard speeds (20-25).
D. |
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A little knowledge is a dangerous thing...
2001 Super Air Nautique 1989 Fairline Corniche 31 www.bannrivercruises.co.uk |
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11061 |
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Posted: March-17-2017 at 9:34am |
Your engine is a big chunk of metal that's constantly producing lots of heat while it's running The cooling system only pumps water through the engine while it's running since the raw water pump depends on engine rotation to turn it. So......you're cruising along at 160 or so degrees and you turn the engine off. Your forced cooling water flow through the engine is gone. The non running engine is a big chunk of metal still giving up plenty of heat to the water that's in the block so the stagnant water heats up and your water temp gauge sees this. When you turn the key back on.to start the engine it's gonna be reading the temperature of that pretty much stagnant water.. As soon as the engine is running, you have your forced cooling flow again and your temp goes back down to normal That's a short, somewhat simplified explanation |
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The Dude
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Posted: March-17-2017 at 1:59pm |
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Thanks everyone.
PCM manifolds and risers. It was doing this before I replaced them, but not to the same level. More like what you guys described--a climb of 20 degrees. This is more like a 40 degree climb. |
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TRBenj
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Joined: June-29-2005 Location: NWCT Status: Offline Points: 21171 |
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Posted: March-17-2017 at 2:22pm |
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How far the temp climbs is going to be a function of water temp, air temp, how hard you ran it prior to shutting down, and how long you've been shut down for. 20-40deg certainly seems within the normal category of what I've seen. The cooling system is wholly ineffective when the engine is off.
I wouldn't give it any more thought. |
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SNobsessed
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Joined: October-21-2007 Location: IA Status: Offline Points: 7102 |
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Posted: March-17-2017 at 8:08pm |
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Restart it as soon as the skier boards. That will minimize the heat soak time.
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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The Dude
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Joined: October-19-2004 Location: Houston Status: Offline Points: 1334 |
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Posted: March-17-2017 at 8:38pm |
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y'all are awesome.
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Mullet Free since 93
95 Sport |
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The Dude wrote: