Thermostat sizing
Thread Starter
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Mountain Pass
Joined: Jul 2015
Posts: 182
Likes: 0
From: Queensland, Australia
Thermostat sizing
Hi, I have a 78 F100 Cleveland 351.
My local part store has
1. DT14C - Low - 71 Deg C
2. DT14A - Medium - 82 Deg C
3. DT14B - High - 91 Deg C
Which thermostat do you Guys consider to get?
I'm in Australia. Winters are mild, Summers are hot, for example tomorrow is set to be 36 Deg C / 96.8 Deg F.
The thermostat I have in it does not seem to work. The temp gauge does not move for an hour. Thanks,
My local part store has
1. DT14C - Low - 71 Deg C
2. DT14A - Medium - 82 Deg C
3. DT14B - High - 91 Deg C
Which thermostat do you Guys consider to get?
I'm in Australia. Winters are mild, Summers are hot, for example tomorrow is set to be 36 Deg C / 96.8 Deg F.
The thermostat I have in it does not seem to work. The temp gauge does not move for an hour. Thanks,
Postmaster
Joined: Mar 2011
Posts: 2,698
Likes: 7
From: Taxachusetts
You'll want the DT14B one...91* C = 195.8* F Ford # D9TZ-8575-A, 192* F. These engines wear/work better with operating temps around 88.9* C
See here:
https://www.ford-trucks.com/forums/1...-question.html
See here:
https://www.ford-trucks.com/forums/1...-question.html
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
Yeah even if it doesn't get cold where you live, the engine needs to get warmed to operating temperature as quickly as practical and to a certain minimum. It sounds strange but cylinder and pistons will wear rapidly when running at lower temperatures, and sludge and acids will accumulate.
Elder User
Joined: Aug 2016
Posts: 723
Likes: 3
From: Cape Town, South Africa
I live in a similar climate to you, run a 351c with Ozzy closed chamber heads and a compression ratio of 10.2.
I used to use a Stant 180 deg F t/stat, part number 13008, but only because I didn't know better, and neither did the shop I bought it from.
But, no matter what my speed was, 30mph or 80mph, the temp stayed at 82 deg C.
I then got the correct 180 deg F t/stat, stant part number 13468, and again the temps stayed at 82 deg C at all speeds.
That said, the main difference was that the incorrect t/stat delayed the engine from warming up quickly (20 minutes or so ?), and the new, correct t/stat, allowed the engine to warm up like a new modern car (5 minutes ?).
The oil temp stays at 90 deg C normally, and the auto tranny oil temp stays at 80 deg C normally.
Today was 34 deg C, and in slow crappy traffic, the coolant saw 90, the engine oil saw 100 and the tranny saw 100.
Within minutes of escaping the traffic, they all returned to average.
I like the 82 deg C t/stat, but there's nothing wrong with a 91 deg C one.
Tedster9's comments are spot on.
Assuming your temp gauge is accurate, then 1 hour is not good at all.
You might find the attached useful :
I used to use a Stant 180 deg F t/stat, part number 13008, but only because I didn't know better, and neither did the shop I bought it from.
But, no matter what my speed was, 30mph or 80mph, the temp stayed at 82 deg C.
I then got the correct 180 deg F t/stat, stant part number 13468, and again the temps stayed at 82 deg C at all speeds.
That said, the main difference was that the incorrect t/stat delayed the engine from warming up quickly (20 minutes or so ?), and the new, correct t/stat, allowed the engine to warm up like a new modern car (5 minutes ?).
The oil temp stays at 90 deg C normally, and the auto tranny oil temp stays at 80 deg C normally.
Today was 34 deg C, and in slow crappy traffic, the coolant saw 90, the engine oil saw 100 and the tranny saw 100.
Within minutes of escaping the traffic, they all returned to average.
I like the 82 deg C t/stat, but there's nothing wrong with a 91 deg C one.
Tedster9's comments are spot on.
Assuming your temp gauge is accurate, then 1 hour is not good at all.
You might find the attached useful :
Thread Starter
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Mountain Pass
Joined: Jul 2015
Posts: 182
Likes: 0
From: Queensland, Australia
Thermostat Plastic Thing
Hi,
I started to take a look at replacing the thermostat today.
I noticed that the new thermostat had a plastic like blob connected to to a link and the link went through the small hole on the rim of the thermosata.
Looked like a minutre float, round 5mm long 4mm diameter.
The okd thermostat did not have this.
Which meant the hole was open all the time.
If there was one connected to the old thermostat, I dont know where it is now, hope its not blocking ant water passage?
Thanks,
I started to take a look at replacing the thermostat today.
I noticed that the new thermostat had a plastic like blob connected to to a link and the link went through the small hole on the rim of the thermosata.
Looked like a minutre float, round 5mm long 4mm diameter.
The okd thermostat did not have this.
Which meant the hole was open all the time.
If there was one connected to the old thermostat, I dont know where it is now, hope its not blocking ant water passage?
Thanks,
Thread Starter
|
Mountain Pass
Joined: Jul 2015
Posts: 182
Likes: 0
From: Queensland, Australia
Hi,
hope I dont jinx myself asking this, things are running good at present.
Just to confirm for future reference and that the fact I dont have the original gauge working anymore.
What temperature value, is it time to start worrying about engine overheat?
Thanks,
hope I dont jinx myself asking this, things are running good at present.
Just to confirm for future reference and that the fact I dont have the original gauge working anymore.
What temperature value, is it time to start worrying about engine overheat?
Thanks,
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Lead Driver
Joined: Nov 2000
Posts: 6,640
Likes: 349
From: Albuquerque
Look like an air relief float. If you run a 192 thermo in a hot climate you a likely to encounter vapor lock depending on the fuel available. There are thermos that have been discussed here with a block off dohickey on the bottom that is apparently the way Ford designed them. Just search for thermos under 335 series.
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Lead Driver
Joined: Jul 2011
Posts: 8,679
Likes: 191
From: On the Edge of the Desert
I run the 195*F thermostat in my Cleveland. I live in the desert southwest where summertime temps can reach over 120*. I, as the others, would recommend the hotter thermostat first, then the one just lower as a second, alternative option.
Proper tuning is going to play a key roll in how well the engine operates at high temperature. Proper ignition timing, fuel mixture and fuel grade to keep it from pinging/ detonating.
I would call overheating anything past 215*F. 101* Celsius
Proper tuning is going to play a key roll in how well the engine operates at high temperature. Proper ignition timing, fuel mixture and fuel grade to keep it from pinging/ detonating.
I would call overheating anything past 215*F. 101* Celsius
Cargo Master
Joined: Nov 2011
Posts: 3,354
Likes: 49
From: Great American SouthWest
I'm also in a warm climate (115+) and I put the proper 192 thermostats in all the trucks. They don't run any hotter, but actually run better!
They warm up quicker, and the warmed-up engine runs better than the cold engine
They actually run cooler in the very hot temps than "no thermostat", as the coolant is held in the radiator a bit longer-at least long enough to actually shed the heat
They warm up quicker, and the warmed-up engine runs better than the cold engine
They actually run cooler in the very hot temps than "no thermostat", as the coolant is held in the radiator a bit longer-at least long enough to actually shed the heat
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