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2011 wakesetter 247 with L96 engine


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where is the thermastat located, I have replaced the impeller and at idle my temps are getting high when I throttle up to speed temps fall back down, need help

johnnylake

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Those symptoms sound backwards to a stuck/ bad thermostat. Why did you change your impeller? Sounds like a you have debris in the transmission cooler.

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i thought that was the logical starting point to replace impeller, do i check hoses going into and out of trans ?

also where is the thermastat located local dealer no help, also looking for number for indmar 

any help will be appreciated

 

johnnylake

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I agree. Did the impeller look chewed up? If so, the missing parts are in the transmission cooler restricting flow. Not 100% sure on your motor, but the older boats the trans cooler is about the size of a beer can right after the impeller. Just follow the hose.

I'll yield to others on the location of the thermostat, but I assume its on the top of the motor where the raw water hoses converge. Wonder if @formulaben  has another fancy photo with the thermostat labeled for a L96 motor.

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The thermostat for the L96 vee drive engines is located on the front of the engine on lower port side.  You can follow the raw water pump outlet hose or the circulation pump hose directly to it.

If you are experiencing overheating at idle and the temperature drops when you throttle up, it is more likely that your air purge hose,  or pipe, on the intake manifold is clogged with debris.  It is a very small pipe that runs along the front of the intake manifold that attaches to each cylinder head.  There is a small rubber hose attached to the pipe on the port side that will either go to the muffler, to the exhaust risers, or to a transom fitting to allow air to be purged from the cooling system at idle.  There are some posts on TMC that go into more detail.  It is a very common issue with raw water cooled L96 engines.

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formulaben
8 hours ago, BlindSquirrel said:

Wonder if @formulaben  has another fancy photo with the thermostat labeled for a L96 motor.

I wish I did, for the most part all I have is Chevy 350/Indmar stuff.

Here is what I do have:

NON-MONSOON MOTORS ONLY

  • Verify the vent line, aka “pee hole” line to transom is clean. On the transom you’ll see a little metal port about the size of a button. After running the engine and shutting down it will continue to vent water like its peeing for a few minutes. If it isn’t venting water it’s plugged up. There’s a hose that will run to the top of the engine. Take that hose off and blow it out with compressed air.
  • Verify the shaft seal is NOT plumbed into the transmission cooler. On an L96 the transmission cooler is on the vacuum side of the cooling system so if the shaft seal is plumbed into the transmission cooler you’ll suck air. If it is plumbed into the transmission cooler you can get a brass plug to screw into the transmission cooler and a T from your dealer to plumb the shaft seal into the correct place.
  • Check your engine serial number. Indmar published Service Bulletin SB2012-3IN to address a cooling issue with the L96 motor. It affects 2012 and 2013 L96 (6.0) and LS3 (6.2) engines with tube and tube exhaust manifolds and 7-digit serial numbers before serial number 2249300.

 

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I pulled the thermastat out and ran the boat it never got hot stayed cool all day, i ordered a new thermastat but will it hurt the motor, temps stayed around 100 instead of around 170 ?

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formulaben

I don't think it will hurt the motor, but it might run a little rich due to the lower temperature.  Keep in mind that some ECUs have power limiting (limp mode) with high and low temps.

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6 hours ago, johnny lake said:

I pulled the thermastat out and ran the boat it never got hot stayed cool all day, i ordered a new thermastat but will it hurt the motor, temps stayed around 100 instead of around 170 ?

Test your thermostat with hot water and a thermometer.  It should open at the stated temperature.

If you still have overheating problems, you may be sucking air before the impeller.  Check the impeller plate and every hose connection between the hull fitting and the pump.  What that means is remove the hose, inspect the hose and the barbs, and reinstall the hose with two clamps at each barb.  Any tiny air leak can cause overheating.

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