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08-26-2018, 11:05 PM | #1 |
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Temp senders on my '51 8CM
I need to replace 1 or both of my temp senders on my 51 Mercury. There is the factory one to the original dash gauge, and there is a second one to an aftermarket gauge mounted under the dash. Neither work. The aftermarket one is on the drivers side of the engine. Does this look like a universal type? I don't understand how the wire connects and also can't find a replacement online for sale. Any help is appreciated.
First picture is aftermarket, second pic is factory. |
08-27-2018, 05:00 AM | #2 |
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Re: Temp senders on my '51 8CM
I would replace both with a dual gage panel under the dash and two mechanical gages .you can buy them at auto zone about twenty dollars each . do not use teflon tape or pipe thread sealer on the fittings . I have done the same in my 53 f-100 the new gages are better then the stock gage and you can see temps from both sides . only my opinion.
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08-27-2018, 05:31 AM | #3 |
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Re: Temp senders on my '51 8CM
That sounds good to me.
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08-27-2018, 06:14 AM | #4 |
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Re: Temp senders on my '51 8CM
The stock one is electric. The after market is a capillary tube. I agree, two after market ones under the dash would work well. You can add an oil pressure gauge too if you want....Mark
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08-27-2018, 07:09 AM | #5 |
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Re: Temp senders on my '51 8CM
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08-27-2018, 07:24 AM | #6 |
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Re: Temp senders on my '51 8CM
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08-27-2018, 07:58 AM | #7 |
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Re: Temp senders on my '51 8CM
Capillary's on mine are GR8. m
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08-27-2018, 08:35 AM | #8 |
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Re: Temp senders on my '51 8CM
Gauges in my 53' Merc......bought mine at O'Reilly's...capillary's...no issues
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08-27-2018, 09:11 AM | #9 |
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Re: Temp senders on my '51 8CM
I have the same setup you now have. The stock gauge is connected to the one-pole sensor and an auxiliary mechanical gauge is connected to the other side. My stock gauge has always worked fine, and I didn't like the idea of having a "dead" gauge in the cluster. I am very satisfied with this setup and he gauges track each other well. One of the things that surprised me is that the stock gauge seems to react to temperature changes faster than the auxiliary gauge.
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08-27-2018, 09:25 AM | #10 |
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Re: Temp senders on my '51 8CM
The old King Sealy system was a damn good set up. They lasted years with no troubles and I'm sure that there are quite a few that are still in service. A lot of folks find it odd that they read full HOT when the ignition switch is off but that's the way they were designed. The right side sender was the one that gave an actual temperature reading. The sender on the left side head is just a high temp on/off type switch. When the temp reaches the high temp set point it just indicates full hot on the gauge. Since the two sides are independent outside of the radiator, they needed to monitor both sides for over temp so this is what KS came up with. I've found quite a few good senders & gauges from parts cars and even some NOS KS parts on flea-pay.
I just can't stand add on gauges hanging down from the dash. Just a personal thing though. Last edited by rotorwrench; 08-27-2018 at 02:16 PM. |
08-27-2018, 09:58 AM | #11 |
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Re: Temp senders on my '51 8CM
rotorwrench,
If you can explain how to re-collaborate the gauge I will gladly reinstall the original sending units and re-hook it up to the gauge in the dash. I played with it for over two years, to include buying two sets of sending units (not cheap) and a second dash gauge then gave up with the original set up. I do have to admit that I do like to see the difference in the temperatures for the two sides (+/- 5 degrees). I do have a laser temp gauge and have confirmed the temps on the gauges. It may not be pretty but it gives me peace of mind when driving. |
08-27-2018, 10:05 AM | #12 |
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Re: Temp senders on my '51 8CM
So what is the issue Merc, are the sensors you have not working? You would think with that many senders and a second gauge one of the combinations would have worked!
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08-27-2018, 10:09 AM | #13 |
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Re: Temp senders on my '51 8CM
Reading 3/4 of the gauge at normal running temp (180), would like to re-calibrate it to read the middle of the gauge at 180.
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08-27-2018, 10:09 AM | #14 |
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Re: Temp senders on my '51 8CM
Related .... Have a '47 AB and understand from various forum postings and my own experience that the right side of the engine typically warms-up faster and runs a little hotter than the left. I suspect that the right and left sides would seldom show the same temp if one was using the same gauge on both .... never tried it. (My OE gauge uses only the right side and my after-market the left side)
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08-27-2018, 10:16 AM | #15 |
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Re: Temp senders on my '51 8CM
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08-27-2018, 10:20 AM | #16 |
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Re: Temp senders on my '51 8CM
Merc Cruzer: I am about to email to another forum member my description (with photos) of how I recalibrated (adjusted is a better description) my OE fuel and oil pressure gauges. My OE temp gauge was okay at the time but the adjustment technic would be the same. Assuming your OE gauges are the same as mine, it requires disassembling the dash gauge cluster and removing the gauge face, working on a "live/hot" gauge and is a "delicate" procedure, but can be done.
You could also adjust your fuel and oil gauges if desired. If you're interested, email me at [email protected] and I will copy you with my procedure/photos. Last edited by Drbrown; 08-27-2018 at 10:26 AM. |
08-27-2018, 10:22 AM | #17 | |
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Re: Temp senders on my '51 8CM
Quote:
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08-27-2018, 10:44 AM | #18 | |
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Re: Temp senders on my '51 8CM
Quote:
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08-27-2018, 02:40 PM | #19 |
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Re: Temp senders on my '51 8CM
My old hand me down 1951 Mercury that my Pop traded for in 1954, never did indicate in the middle. The 1950 & 51 Mercury cars didn't have any temp amounts on the indicator. It just had a tick for cold, mid point, and hot. It always gave a reading between mid point and hot. All of our other 8BA powered vehicles were pretty much the same. You always knew when they got hot when that cloud of steam came out from under the hood. I never really worried about it much otherwise.
To calibrate one, it would have to be calibrated for Hot at the over heating point. Where it rides in between is anybody's guess. |
08-27-2018, 05:37 PM | #20 |
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Re: Temp senders on my '51 8CM
My '51 also reads about 3/4 when it's at 180. I think that is the way they were originally set up. I would hesitate to try to change the gauge to work differently that it was originally designed.
Also, I have heard nothing but bad things about the reproduction temprature senders. If they work at all, it's only for a very short time. Better to try to find an NOS or good used original unit. I was able to repair a non-functional original unit by disassembling it and cleaning and filing the points. There is an adjustment screw inside the sending unit as well; if you want to try to adjust it, you sould begin there. |
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