|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
09-02-2015, 08:27 AM | #1 |
Junior Member
Join Date: Sep 2015
Location: Crystal Lake, IL
Posts: 13
|
Temperture sending units
My 40 V8 flathead has one temperature sending unit installed and the other hole is plugged with a bolt. My temperature gauge says I am running hot.
Do I need the other, 2 leaded sensor, for my gauge read correctly? I was also considering installing a after market sensor and gauge to double check the temperature. |
09-02-2015, 08:31 AM | #2 |
Senior Member
Join Date: Oct 2010
Location: Orem, Utah
Posts: 5,762
|
Re: Temperture sending units
The two lead sensor is not needed for the single lead sensor to work right. The two lead sensor is just a "circuit breaker" that opens above a certain temperature to send the gauge to HOT. I have a mechanical sender for a mechanical gauge in that two lead sensor hole to know more precisely the true temperature of the engine.
__________________
Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness |
Sponsored Links (Register now to hide all advertisements) |
|
09-02-2015, 08:39 AM | #3 |
Junior Member
Join Date: Sep 2015
Location: Crystal Lake, IL
Posts: 13
|
Re: Temperture sending units
Thank you. Since I am thinking of adding a gauge set, do you know of any 6 Volt gauges (to monitor charging) in the same style? All I can find are 8-18 v models.
|
09-02-2015, 08:49 AM | #4 |
Senior Member
Join Date: Dec 2012
Location: Massillon, Ohio
Posts: 783
|
Re: Temperture sending units
R2 I agree with Henry. Install a Stewart Warner or similar brand mechanical gauge. You will know for sure what your temp is. I also installed an oil pressure gauge next to the temp. Amazing what the real pressure is vs: what the dash gauge says.
|
09-02-2015, 09:05 AM | #5 |
Senior Member
Join Date: Oct 2010
Location: Orem, Utah
Posts: 5,762
|
Re: Temperture sending units
I use a cheap mechanical gauge from AutoZone. See this thread: https://www.fordbarn.com/forum/showthread.php?t=88541 I have also added a mechanical oil pressure gauge to monitor that more precisely.
__________________
Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness Last edited by Old Henry; 09-02-2015 at 09:17 AM. |
09-02-2015, 09:15 AM | #6 |
Senior Member
Join Date: May 2010
Location: Coral Springs FL
Posts: 10,943
|
Re: Temperture sending units
Sponsored Links (Register now to hide all advertisements)
|
09-02-2015, 09:40 AM | #7 | |
Junior Member
Join Date: Jul 2015
Posts: 6
|
Re: Temperture sending units
Quote:
|
|
09-02-2015, 10:03 AM | #8 |
Member
Join Date: May 2015
Location: Mission Viejo, CA
Posts: 88
|
Re: Temperture sending units
Newbie to flat heads and my 40 pickup is running hot, questions: Do the after market temp gauges come with the temp sensor? Or do I need to buy the sensor separate? Any recommendations where to purchase the sensors for a 40 ford pickup converted to 12 volt?
Looks like the auto zone temp gauges above work. Any other recommendations for after market temp gauges? Thanks in advance !! |
09-02-2015, 10:19 AM | #9 |
Senior Member
Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 10,317
|
Re: Temperture sending units
The "mechanical" (non-electric) gauges come with sending bulb that screws into the engine (it will also have and adapter or two with it) on the end of a long flexible tube. I have a SunPro gauge (like Henry shows) on my engine test stand and I believe the flexible tube is at least 6 feet long. I just looped it and used tie-wraps to keep it out of the way.SunPro gauges are pretty cheap and maligned by some, but they have worked fine for me. If you look hard enough, I believe you can get them with black faces. I don't think I've never seen an aftermarket electric temp gauge, so I can't help you there.
|
09-02-2015, 10:23 AM | #10 |
Senior Member
Join Date: Mar 2014
Location: Webster, NY
Posts: 215
|
Re: Temperture sending units
Hopefully the bolt you mention is just the OEM plug (11/16" hex), as was mine. I second the (Sunpro) mechanical gauge approach. The kit I bought (Sunpro CP8217) had the correct threaded adapter for the head. Note that the hex required a 16 MM socket/wrench (between 5/8" and 11/16") to tighten. I bought a "51" 6-volt bulb from BulbTown.com to replace the 12-volt bulb in the kit. I bought replacements for all the 6-volt bulbs used in my 1940 fire engine at the same time.
|
09-02-2015, 12:19 PM | #11 |
Senior Member
Join Date: May 2010
Location: Southern Illinois
Posts: 3,795
|
Re: Temperture sending units
I just installed an autometer brand mechanical temp gauge on an 8ba engine. Make sure the two mounting fittings that thread into the head are 3/8in NPT. Autometer did not and I had to buy it separately. For the price of the gauge you think they would include a 3/8th but they only provide you with 1/2in NPT.
I also have a mechanical temp gauge on a 59A engine and highway speeds it runs about 170 degrees and if I slow up for traffic it will climb to 180. Depends on speed of course. On a hot humid day sitting still it can get warm. |
09-02-2015, 02:02 PM | #12 |
Member
Join Date: May 2015
Location: Mission Viejo, CA
Posts: 88
|
Re: Temperture sending units
Thanks for your help. The Sunpro CP8217 seem like a good price.
|
09-02-2015, 02:08 PM | #13 |
Senior Member
Join Date: May 2010
Location: Southern Illinois
Posts: 3,795
|
Re: Temperture sending units
|
09-02-2015, 02:16 PM | #14 |
Member
Join Date: May 2015
Location: Mission Viejo, CA
Posts: 88
|
Re: Temperture sending units
Will I need any type of thread sealant to install the sensors?
|
09-02-2015, 04:31 PM | #15 |
Senior Member
Join Date: Oct 2010
Location: Orem, Utah
Posts: 5,762
|
Re: Temperture sending units
On the mechanical sensor any sealant will do, Teflon tape, pipe dope, etc. But, if you're replacing an electric sensor there has to be electrical contact through the threads to the engine block to ground the circuit so I use nothing and it still doesn't leak.
__________________
Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness |
09-02-2015, 05:06 PM | #16 |
Member
Join Date: May 2015
Location: Mission Viejo, CA
Posts: 88
|
Re: Temperture sending units
That's really good info, thanks much !!
|
09-02-2015, 06:04 PM | #17 |
Member
Join Date: Mar 2015
Location: Portland Oregon
Posts: 86
|
Re: Temperture sending units
In theory, your mechanical temperature gauge adapter/bulb/jam nut should not require any sealant as the adapter is pipe thread and the bulb seats on a shoulder within the adapter, much like a valve. If the threading on your sender hole is damaged you might consider repair or threading to the next adapter size up. Also, use a brass adapter, the steel ones keep our shop in business.
www.morrisgauge.com |
09-02-2015, 06:27 PM | #18 |
Senior Member
Join Date: Oct 2010
Location: Orem, Utah
Posts: 5,762
|
Re: Temperture sending units
Minimum temperature should be what your thermostat is set at. That would be ideal if that could be maintained but the temperature rises with many circumstances including outside ambient temperature, speed, wind direction (is more important than may be thought), steepness of a climb, etc. I know that with my 4 lb. radiator cap I can get up to 225° before boiling the coolant out. So, anything between my thermostat setting of 170° and that boil out temperature is fine with me.
__________________
Prof. Henry (The Roaming Gnome) "It is good to have an end to journey toward; but it is the journey that matters, in the end.” *Ursula K. Le Guin in The Left Hand of Darkness |
09-03-2015, 08:07 AM | #19 |
Senior Member
Join Date: Mar 2011
Location: Overland Park, Ks
Posts: 559
|
Re: Temperture sending units
I just purchased 50/50 antifreeze on the back of the container it shows boiling at 265 deg. I use a 7lb pressure cap on my 53, I also use a mechanical gauge, the markings on a mechanical are better.
|
09-03-2015, 10:22 AM | #20 |
Member
Join Date: May 2015
Location: Mission Viejo, CA
Posts: 88
|
Re: Temperture sending units
Since I don't know what radiator cap I have I'm thinking I should replace it. I was told 6lb for a 40 ford pickup. Would this be correct?
|
|
|
Sponsored Links (Register now to hide all advertisements) |
|