Water Temp guage for 2004 F115

[dray0151]

Looking to install a water temp gauge on my 2004 F115TLRC. It has the standard Temp Sensor installed on the starboard side top of block. Currently has a water pressure line installed toward the bottom of the block on the same side. Is there
another port to install a temp gauge or can I remove the pressure fitting and line and install temp sending unit there?
There is a 17mm plug on this side also down close to where the water pressure line is installed just above the anode cover , it as far as I can tell is called just a straight plug and appears to go into the water chambers?

[throrope]

I wish I could answer your question.

With my first car in case my belt let go, I kept a spare in the trunk. Then I realized it wouldn't let go if I put the new one on the car.

An alternative could be replacing the thermostats, flushing the system of clutter and crap, testing the alarms and avoid needing a gauge.

[dray0151]

I flush the engine after each use and plan on replacing the thermostat, but felt a temp gauge was more useful than a water pressure gauge just from my automotive background. Thanks fro your reply i still want to hear from Rodbolt or Boscoe!

[rodbolt17]

I would rather have the water pressure over the temp.
test the alarm system occasionally do the maint and roll.

[boscoe99]

The F115 has one provision (hole) only for either a temperature sender or a water pressure fitting. No practical way to have both.

I agree with rodnut that my preference would be for the pressure gauge over the temperature gauge. Test the over temperature system to verify that it is working and rely upon it.

Having said that, there are non-Yamaha temperature gauge senders than can be mounted to the block to indirectly measure water temperature. Teleflex being one.

The big nut you are seeing right above the anode covers the port where an oxygen sensor can be installed. It cannot be used for a water pressure gauge since that is part of the exhaust system.

If you want to test your over temperature warning system go to Radio Shack and buy a 220 ohm resistor. Remove the connector to the engine temperature sensor. Jumper the resistor across the two terminal pins that are within the connector. Start the motor. Just let it idle. Wait for up to about a minute and a half. The horn should sound. If a Yamaha tachometer is installed either a light should illuminate or an LCD bar should be flashing. You now know that the system is hunky dory.

[dray0151]

Thanks to you both for the response. I will probably go ahead and just routinely test the system since nothing allows for both gauges on the 115. I already have a new thermostat on the way to replace the old one since it is hard to remove and I don't want to pry it out and not have the replacement.

I'll have to check on the resistor since Radio Shack is not around me I'm sure I can find it somewhere else.

[scofflaw]

I like a temp. gauge as well. That hot horn on the yamaha is like 1960's car technology. AKA Idiot lights. I bought the Yam setup ..gauge/sender assembly and marinetexd the sender to a recess on the head. Not in a water jacket but now have a reference on the gauge what normal is. Works for me

[boscoe99]

I like a temp. gauge as well. That hot horn on the yamaha is like 1960's car technology. AKA Idiot lights. I bought the Yam setup ..gauge/sender assembly and marinetexd the sender to a recess on the head. Not in a water jacket but now have a reference on the gauge what normal is. Works for me

Did you scrape the paint from the area where the sender was attached? Did you use any thermal transfer compound? All to facilitate the transfer of heat that is.

[99yam40]

If he put a big gob of marine tex on it, it may take awhile, but it all should get to the same temp as the block eventually.
not much wind under there to carry the heat away

[boscoe99]

If he put a big gob of marine tex on it, it may take awhile, but it all should get to the same temp as the block eventually.
not much wind under there to carry the heat away

Yep. On the other hand if the temperature starts to rise there may be a delay (excessive?) in seeing it. But if the alarm system is working he would get the notice from that.

[rodbolt17]

I would much prefer an audible over a visual indicate.
over the years I have looked at the temp guage wondering how long has it been pegged.

[throrope]

I would much prefer an audible over a visual indicate.
over the years I have looked at the temp guage wondering how long has it been pegged.

Same here.

[scofflaw]

I monitor my gauges , no different than driving your pickup cross country. What else you suppose to be doing. Watch the traffic, watch your gauges.

[boscoe99]

CruzPro electronic boat instruments, alarms, digital gauges and monitors makes a standalone digital display temperature gauge that can be connected to an alarm system. Visual and audio. Would be a belt and suspenders approach if used in conjunction with the Yamaha alarm system.

Set it for 5 degrees below the Yamaha alarm just to let you know that something else is about to happen.

[scofflaw]

Seems as though my running temp, monitored on the Yamaha gauge, which has no numbers ,just a couple of reference points.is miles away from the overheat section.

I had the same sender/ gauge. setup installed identically in the old motor before it blew. Its normal running temp was much closer to the alarm temp area, which makes me think that block wasn't flowing water all that well. Didn't realize this until I put that gauge on the newer motor.