4.0 head on 258 - Where does temp sending unit go? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 02-18-2003, 11:23 AM Thread Starter
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4.0 head on 258 - Where does temp sending unit go?

Unless I am missing something, I cannot find a place to install the temp sending unit on the 4.0 head sitting on the 258 block. I have read the various writeups (Jaffer, Weaver etc.), but find no direct mention of this. I have the correct 4.0 HO head casting #7120. On my stock head it is located on the top of the head near the drivers side firewall (84 CJ7)

Any help greatly appreciated. Be kind if I am a complete idiot on this.

Thanks
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post #2 of (permalink) Old 02-18-2003, 11:56 AM
 
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Re: 4.0 head on 258 - Where does temp sending unit go?

Didn't Frenchjeeper figure out that you need to use a 4.0L thermostat housing and that has the temp sensor bung?
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post #3 of (permalink) Old 02-18-2003, 12:57 PM
 
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Re: 4.0 head on 258 - Where does temp sending unit go?


That is exactly where it goes. I went to the local auto parts store and brought the housing and sending unit. Came with the gasket.

Good luck,
Fran
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post #4 of (permalink) Old 02-18-2003, 01:02 PM
 
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Re: 4.0 head on 258 - Where does temp sending unit go?

After you get your rig running great take a look at this set up!

http://www.bgsoflex.com/megasquirt.html

By the way if you need any advice just ask. The power is going to be pretty awesome! What carb do you plan on running.

Good luck,
Fran
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post #5 of (permalink) Old 02-18-2003, 02:44 PM
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Re: 4.0 head on 258 - Where does temp sending unit go?

I just took a look at my 4.0 head which is yet to be installed (I have no garage). It came with the t-stat housing and the temp sender still attached. It's all good for me. But, the very rear driver's side of the head has what appears to be an electronic sender screwed into the head on the top, next to the valve cover. What's this for? Like the temp sender Q, I have yet to see this addressed in the articals. Maybe it's nothing, and I'll just need to plug the hole / leave the sender in place.

Let me know if i need to snap a pic. Thanks
post #6 of (permalink) Old 02-18-2003, 03:20 PM
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Re: 4.0 head on 258 - Where does temp sending unit go?

Depends.....

What wiring harness are u using?

I had to use and inline sending unit in the heater hose. On the Hesco harness, the computer needs the info from that sending unit. Just another thought. [img]images/graemlins/givemebeer.gif[/img]
post #7 of (permalink) Old 02-18-2003, 05:04 PM
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Re: 4.0 head on 258 - Where does temp sending unit go?

On my 4.0 hd from a '95, the temp sending unit that works with the guage is located on top of the head by drivers' side firewall, the sending unit in the thermostat housing is used by the MPI system for computer data.
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post #8 of (permalink) Old 02-18-2003, 06:09 PM
 
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Re: 4.0 head on 258 - Where does temp sending unit go?

Frosty is exactly right the temp sender is located on drivers side in the back of the head. The MPI sender for the computer is located on the T-stat housing.
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post #9 of (permalink) Old 02-18-2003, 07:22 PM
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Re: 4.0 head on 258 - Where does temp sending unit go?

Since I'm already running the MPI kit (installed by PO), I'll have to check to see if I need both.
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