Sending units
#11
Registered
Actually this one is probably the correct one: https://www.cpperformance.com/p-1307...si-gauges.aspx
#12
Registered
Not sure what the OP is running but on my engs, on the thermostat housing, there's a temp switch and a temp sender. They look very similar and the connection is the same type (ring terminal on a post with a nut). The temp switch actuates the warn horn if temp gets to high.
#13
Charter Member#568
Charter Member
Thread Starter
This whole thing started because of the engines inability to build any heat in the oil or water despite having thermostats in both systems (water has a crossover with bypass and stat which I know some people dislike because of these problems, but I'm trying to learn exactly why some work and some don't before abandoning the setup). I initially thought it would just be a matter of selecting the correct t-stat to get some water temp, so I went out with 3 different stats to get some temp readings and couldn't get the gauge to even move. The gauge starts at 100° so I was either under 100 or there was a gauge / sender problem. Just for the hell of it I decided to run without the t-stat to see what would happen. In the few minutes it took to get the boat on plane and trimmed out the temp gauge was at 200°. I could tell by touching the engine that it was definitely hotter but this seems a bit extreme to go from <100 with a stat to >200 without one in a couple mins. This is why I was looking to rule out the sender as a problem. After going out again today with a temp probe I'm inclined to believe the sender is correct and those are the actual temps.
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- if anyone has any thoughts on why I can only get 80° with a stat but hit 200° without one and nothing in between I'd like to know.
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As far as the sending units go, it would still be nice to figure out exactly what the correct one is for this type gauge in a non marine application so it can be purchased locally and not have to go mail order through CP.
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Griff, all the electric gauges say Gaffrig Precision Instruments. All the mechanical gauges just say Gaffrig which I thought was interesting that they were labeled differently.
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- if anyone has any thoughts on why I can only get 80° with a stat but hit 200° without one and nothing in between I'd like to know.
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As far as the sending units go, it would still be nice to figure out exactly what the correct one is for this type gauge in a non marine application so it can be purchased locally and not have to go mail order through CP.
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Griff, all the electric gauges say Gaffrig Precision Instruments. All the mechanical gauges just say Gaffrig which I thought was interesting that they were labeled differently.
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Straight bottoms and flat decks
Straight bottoms and flat decks
Last edited by bck; 10-22-2019 at 02:52 AM.
#14
Charter Member#568
Charter Member
Thread Starter
Sorry about the terrible photo but battery was too low for flash so i had to try shining a flashlight on it.
This is the t-stat housing which has a diverter in it so bypass water doesn't go right on the thermostat. In theory...
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Straight bottoms and flat decks
Straight bottoms and flat decks
#15
Registered
What if there is not such a thing ? If I was having a problem I would want to make sure I had the correct sending unit. You would have already had it by now if you ordered it from CP.
#16
Charter Member#568
Charter Member
Thread Starter
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So the end result is my senders are good but I'll use the winter to look into them and find out what they actually are just out curiosity if nothing else. I seem to just be on the extreme ends of the cooling problems people typically complain of when running combinations of stats / bypasses / crossovers. As a side note, I also changed props and bumping the rpm up 500-600 rpm brought the oil temp from too low to register up to 200°.
So the end result is my senders are good but I'll use the winter to look into them and find out what they actually are just out curiosity if nothing else. I seem to just be on the extreme ends of the cooling problems people typically complain of when running combinations of stats / bypasses / crossovers. As a side note, I also changed props and bumping the rpm up 500-600 rpm brought the oil temp from too low to register up to 200°.
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Straight bottoms and flat decks
Straight bottoms and flat decks
Last edited by bck; 10-22-2019 at 09:49 AM.
#17
Charter Member # 55
Charter Member
Those are similar to my gauges, except the position of the numbers. Mine use a stock Merc sender. If you look at mine, you will see my 165* position is the same as your 200* location. So, yes I do think you probably have the wrong sender for your gauge. If you pull the gauge it should have a sticker on the side that tells you what ohm sender it needs.
#18
Charter Member # 55
Charter Member
If you go to the Industrial Series gauges, the 100-250* gauge has the same layout as yours and it should use the same sender. http://www.livorsi.com/pdf/lmi%20volume%2018_rev5.pdf
#19
Charter Member#568
Charter Member
Thread Starter
I'll pull the gauge and see if I can find the sticker you mention. Thanks for the info.
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Straight bottoms and flat decks
Straight bottoms and flat decks