over heating at idle

[whitetige]

i have 2003 20i and it will overheat if i launch and idle in no wake zone till the guy parking my truck gets down to dock. by the time i get out of no wake zone to hot and wont let me give it gas. if i launch and make it out of the no wake zone before it gets above 215 degrees. i can give it gas and it will be just fine. I think there might be an air leak before the impeller. impeller is brand new. And when in drive way, hooked to fake a lake it will idle just fine....... any suggesions

[TeamAllen]

Try this thread.

http://www.tigeowners.com/forum/show...ht=overheating

He found it was the wrong size impeller causing the issue. Good luck!

[sincity]

i have the same motor and same problem, these motors run anywhere between 175 and 190 degrees, if you idle through an extremely long no wake zone the temp wil climb above 200, and it will vavpor lock, it will idle but you cant give it gas, i had the boat into the dealer a couple of times, they never did fix the problem, there is one easy fix, if your boat does it again, either take some cold lake water and pour it on the fuel pump at the top of the water fuel separator or take a small sandwich bag with ice and place it on top of the pump, with in a few seconds you will be able to give it throttle, on lake mead we have a no wake zone about half a mile long. also, same thing with my boat, i can hook it up to the garden hose at home and it wont go above 185, i would imagine being at home hooked to a garden hose and not being in gear verses a no wake zone where your in gear makes the difference as far as heat goes, but for emissions reasons the 6.0 liter engines is designed to run hotter.

sin city

[whitetige]

i think i might of figured it out. The hose that goes from the pickup scoop, to the medal tube that sends water to the tranny. it goes under the transmission and it somehow got under a spot were the trans was pinching it.im working on gettin the hose out to replace it. but it is not easy.

[sincity]

hmmm, i will take a look at mine.
sincity

[jsz]

If your water pump has grooves from normal wear, it may not be pushing enough water through. Even with a new impeller, it will still not push as much water as it is supposed to. I have an '02 with 580 hours and my mechanic said I needed a new pump even though the grooves did not seem like a big deal to me.

A boat moving forward will pressurize the water coming to the pump just like water coming from a hose (in your driveway) is pressurized. While you are floating at idle, it is not. Grooves in the pump housing may be more dangerous when floating at idle. The lack of pressurized water may be enough to make you overheat.

[jsz]

1 more pic

[-PURREN-]

my pump housing was a bitg worn so i got it machined flat again

[Moki]

I have a different engine, but I was having problems with my new impeller being chewed up from the old housing. My housing is plastic, so it is rather cheap to replace. But, I would recommend replacing it.

[chpthril]

I have a different engine, but I was having problems with my new impeller being chewed up from the old housing. My housing is plastic, so it is rather cheap to replace. But, I would recommend replacing it.

TRD was also having problems till he took a hard look at the impeller housing. After replacement, never had any other issues. If you ever have a major impeller failure, odds are the housing is toast. They will get too hot and end up out of round and or have major grooves. Also look at the coloring, if it's bluish, it's done.