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2004 2.8L head from UK, alternate temp sender option
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=89133		 Page 1 of 1
Author:  Mountainman [ Wed Aug 15, 2018 9:18 pm ]
Post subject:  2004 2.8L head from UK, alternate temp sender option
I gambled and bought a 2004 head from the UK.
Looks identical except there is only 1 water port on the intake side, and it had an identical to ours temp sender housed theirin.

Useful:
1. Puts to rest any worries about eliminating the egr cooling circuit as this head doesn't even have the port and the head is stamped with the exact same part #.
2. Gives us another option for temp sender home. Insulated from exhaust/ turbo heat, and directly inside the head. Maybe worse/archaic design/location?
Author:  GordnadoCRD [ Wed Aug 15, 2018 9:57 pm ]
Post subject:  Re: 2004 2.8L head from UK, alternate temp sender option
My new one from IDParts also only had one water port on the intake side, but with the Weeks kits, it was unneeded and blocked off.
Author:  Sir Sam [ Wed Aug 15, 2018 10:12 pm ]
Post subject:  Re: 2004 2.8L head from UK, alternate temp sender option
Mountainman wrote:
I gambled and bought a 2004 head from the UK.
Looks identical except there is only 1 water port on the intake side, and it had an identical to ours temp sender.

Useful:
1. Puts to rest any worries about eliminating the egr cooling circuit as this head doesn't even have the port and the head is stamped with the exact same part #.
2. Gives us another option for temp sender home. Insulated from exhaust/ turbo heat, and directly inside the head. Maybe worse/archaic design/location?


This blue sensor is the coolant temp sensor on my 2.5 in the MJ, is this the same location you are thinking of?

Image
Author:  WWDiesel [ Wed Aug 15, 2018 10:30 pm ]
Post subject:  Re: 2004 2.8L head from UK, alternate temp sender option
I was always of the opinion that this center outlet from the head to the EGR cooler and then back to the suction of the water pump could be detrimental to the head and the engine as it allows coolant to totally bypass the thermostat and the radiator cooling circuit. This could allow coolant temperatures in the head due to this circular environment to rise to undesirable levels. A very poor design to say the least! :roll:

That is why it is best to totally remove the EGR system and all it's plumbing...
Author:  Mountainman [ Wed Aug 15, 2018 11:04 pm ]
Post subject:  Re: 2004 2.8L head from UK, alternate temp sender option
Sir Sam wrote:
Mountainman wrote:
I gambled and bought a 2004 head from the UK.
Looks identical except there is only 1 water port on the intake side, and it had an identical to ours temp sender.

Useful:
1. Puts to rest any worries about eliminating the egr cooling circuit as this head doesn't even have the port and the head is stamped with the exact same part #.
2. Gives us another option for temp sender home. Insulated from exhaust/ turbo heat, and directly inside the head. Maybe worse/archaic design/location?


This blue sensor is the coolant temp sensor on my 2.5 in the MJ, is this the same location you are thinking of?

Image


Yup, exactly the same spot. I knew someone was going to burst my bubble.
Author:  Mountainman [ Wed Aug 15, 2018 11:17 pm ]
Post subject:  Re: 2004 2.8L head from UK, alternate temp sender option
WWDiesel wrote:
I was always of the opinion that this center outlet from the head to the EGR cooler and then back to the suction of the water pump could be detrimental to the head and the engine as it allows coolant to totally bypass the thermostat and the radiator cooling circuit. This could allow coolant temperatures in the head due to this circular environment to rise to undesirable levels. A very poor design to say the least! :roll:

That is why it is best to totally remove the EGR system and all it's plumbing...


I wonder if that is another feature for faster warm-up to further reduce emissions?
Meh, I'm with you. I also really like eliminating SEVERAL coolant hose connections that will leak eventually.
Author:  flash7210 [ Thu Aug 16, 2018 8:30 am ]
Post subject:  Re: 2004 2.8L head from UK, alternate temp sender option
Mountainman wrote:
WWDiesel wrote:
I was always of the opinion that this center outlet from the head to the EGR cooler and then back to the suction of the water pump could be detrimental to the head and the engine as it allows coolant to totally bypass the thermostat and the radiator cooling circuit. This could allow coolant temperatures in the head due to this circular environment to rise to undesirable levels. A very poor design to say the least! :roll:

That is why it is best to totally remove the EGR system and all it's plumbing...


I wonder if that is another feature for faster warm-up to further reduce emissions?
Meh, I'm with you. I also really like eliminating SEVERAL coolant hose connections that will leak eventually.

Instead of completely blocking off the EGR cooler port on the side of the head, I routed it to the heater core. I did this because I broke one of the plastic fittings on the thermostat housing.
It functions exactly the same as the stock heater hose routing.

The rear coolant port on the side of the head is where I attached a temperature sensor.
The sensor doesn't actually go into the water jacket. Its just attached to the threaded plug.
I had a theory that the rear cylinders were running hotter than the front. Now I know that is not the case. But it does allow me to compare cylinder head temp to coolant temp and how well the cooling system is removing heat from the head.
For example, when stopped and idling, cylinder head and coolant temp are almost equal. But as rpm and coolant flow increases, head temp starts to drop while coolant temp stays about the same.
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