Still Overheating |
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cmacbuck69
Senior Member Joined: June-19-2013 Location: Jax, FL Status: Offline Points: 105 |
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Posted: May-30-2015 at 2:32pm |
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I went through the whole rigamaroll with the overheating problem and had it nailed at 160 with the bucket in the driveway. I finally have it back on the water and with s load on it the gauge is showing around 200 again. Any thoughts on this? I have gone through and tightened al of the hose clamps to make sure I was not sucking air at connections... So frustrated!
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Chris,
Overheating at speed can be a T stat problem or blockage. Sucking air on the suction side of the RWP typically shows up at idle. Have you taken an IR reading to confirm the temp? |
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cmacbuck69
Senior Member Joined: June-19-2013 Location: Jax, FL Status: Offline Points: 105 |
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I took the t-stat out completely and still overheated. I think my exhaust manifolds are corroded and may be the source of the blockage....
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peter1234
Grand Poobah Joined: February-03-2008 Location: United States Status: Offline Points: 2756 |
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Pete not to thread jack here but do you think there are times that the gauges are supposed to read from a ballast resister in the system or just straight 12 volts i am asking because my corvette usually reads an avg of 165 and if i use any one of 3 different temp scans and remote bulbs to read actual temp i find that the gauge reads higher than it ever has the only difference is that i removed a ballast resister in the ignition circuit when it says 210-220 every test i try says its 165 = or take
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former skylark owner now a formula but I cant let this place go
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Peter,
There are older gauges that utilize voltage stabilizers. The S/W gauges in my 64 X55 is an example. The idea is that no matter what the alternator (or generator) is putting out, the gauge still reads the same. The ballast resistor in the ignition circuit should not influence the gauges. |
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peter1234
Grand Poobah Joined: February-03-2008 Location: United States Status: Offline Points: 2756 |
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thanks i though so
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former skylark owner now a formula but I cant let this place go
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seacamper
Platinum Member Joined: June-24-2010 Location: Florida Status: Offline Points: 1056 |
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New RWP? What boat do you have? Do you have a dual exhaust? Is the amount of water coming out of each exhaust about the same on the hose? |
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1980 Ski Nautique Boat Bar
1988 Mastercraft Tristar Open Bow 1988 Mastercraft Tristar Closed Bow 1969 Seacamper Houseboat 1986 Harris Pontoon 2004 Seadoo GTX SC + Flydive Xboard 1999 Adventurecraft |
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LeftFieldEngineering
Senior Member Joined: December-20-2010 Location: Monson, MA Status: Offline Points: 384 |
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If it's not coming out equally, what does that mean? |
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seacamper
Platinum Member Joined: June-24-2010 Location: Florida Status: Offline Points: 1056 |
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Well, on my 75, it told me one side was putting out much more cooling water than the other, and it turned out to be a clogged output on my starboard riser. I have an Escort marinization, and I was able to get a hack saw blade into the back of the riser output, and knock loose a bunch of scale, which increased the water flow, and cooled the hot riser condition I was having, and seemed to knock 5 degrees off the temp gauge. Tom |
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1980 Ski Nautique Boat Bar
1988 Mastercraft Tristar Open Bow 1988 Mastercraft Tristar Closed Bow 1969 Seacamper Houseboat 1986 Harris Pontoon 2004 Seadoo GTX SC + Flydive Xboard 1999 Adventurecraft |
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Swatkinz
Platinum Member Joined: December-03-2003 Location: Lexington, SC Status: Offline Points: 1307 |
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Had this problem with my 88. Threw all kinds of parts at it. clamps, hoses, tstats, impellers, o ring seals, sending unit, etc. Checked and tested the RWP and then checked and tested all again. I had an infrared thermometer gauge that I ended up using to confirm that it was not running hot despite what the dash gauge said.
I ordered a replacement temp gauge but ended up selling the boat before installing the gauge to verify the problem. Frustrating experience.. good luck. |
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Steve
2011 Sport/Air 200 Excalibur 343 2017 Boatmate Tandem Axle Trailer Former CC owner (77, 80, 95, 88, all SNs) Former Malibu owner (07, 09) |
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cmacbuck69
Senior Member Joined: June-19-2013 Location: Jax, FL Status: Offline Points: 105 |
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Finally found the issue! I have been so focused on getting cold water into the engine that I overlooked the hot water getting out. The exhaust manifold riser was swollen so bad from corrosion that it was letting a small portion of hot water out of the engine. Two photos, 1 is the old riser and 2. the new riser. Replaced both risers, dunked her in the creek for a test run and she is running like a top! Valuable lesson. Halleluiah...Bourbons up!
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Seeing your from Jacksonville where were you running it?
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cmacbuck69
Senior Member Joined: June-19-2013 Location: Jax, FL Status: Offline Points: 105 |
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Black Creek. I live on the Southside now so ready to explore closer places now that she is running... I'll give Julingtona shot, but not sure outside of that. Are you from Jax?
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Gary S
Grand Poobah Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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No I'm just thinking it looks pretty clogged up for fresh water
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cmacbuck69
Senior Member Joined: June-19-2013 Location: Jax, FL Status: Offline Points: 105 |
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It's been run in brackish water 31 out of its 32 years...
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KRoundy
Platinum Member Joined: August-23-2010 Location: Lake Stevens Status: Offline Points: 1702 |
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Ah salt... so tasty, so awful for boats. Congratulations on finding the problem.
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Previous: 1993 Electric Blue/Charcoal Ski Nautique
Current: 2016 Ski Nautique 200 Open Bow |
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