4.0L Headers

[Throttle]

Anyone got an idea on how long it takes to install headers? and what sort of procedures you have to follow... meaning... what kinda parts you have to remove to be able to slide them in?

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'89 4.0L Cherokee Laredo

[Wes Rempel]

Remove the bolts holding in the headers and intake. Remove gasket. Clean surface well. Install new gasket. Install new header and intake. Make sure none of the wires are touching the headers (crank case position sensor is prone to).
I think it is like 12 bolts, but with different torque specs for some.

How long? Ummm... I was replacing my block at the time (and in a YJ mind you) and the whole process took 3 weekends...

Wes

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...a member of the herd
www.hot.alloffroad.com

[Regger]

Originally posted by Wes Rempel:
Remove the bolts holding in the headers and intake. Remove gasket. Clean surface well. Install new gasket. Install new header and intake. Make sure none of the wires are touching the headers (crank case position sensor is prone to).
I think it is like 12 bolts, but with different torque specs for some.

How long? Ummm... I was replacing my block at the time (and in a YJ mind you) and the whole process took 3 weekends...

Wes




Well I put in a Borla header on my MJ and it took me in total about 6-7hours. But I also took some time and honed out the inside of the header for better flow. I also had a problem with the EGR tube. It didnt fit correctly, so my advice to you is, install the tube to the intake and header before you install them on the block. That way you can manipulate the header into place. The worst bolt to get is the bottom row middle bolt. Its a PITA to get to and takes forever to tighten once you get a wrench on it.

Wes also has a good point to make sure all wires are tied back, as I was the victim of sloppy wire tying and blew the CPS and Computer the first time, and then the CPS sensor a sceond time. I now know better.

Hope that helps, If you have any other questions give me an email.

Ryan


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'88 MJ ~6" Lift. 4.10 fr&rr, 33" Mud King XT

[nikon_jeeper]

FSM also says to drain the cooling system...but I don't remember any of my friends actually doing that when they replaced theirs. http://www.bc4x4.com/ubb/wink.gif



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Phil M. - Kent, WA
95 XJ Sport w/Stuff
"Who cares about a list of crap, can you drive it?"

[crazyguy]

FSM probally assumes your removing the intake at the same time. then again the FSM wants the coolent drained to do almost anything

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-'85 XJ,2dr,4cyl,5spd,31x10.5's,2"lift,onboard air,bla,bla,bla,
-'82 J-10 Project truck, 258 straight 6, 5spd, 30x9.5's
"its not what you drive, or where you drive,
its driving what you have to where you want to go"

[Regger]

Originally posted by crazyguy:
FSM probally assumes your removing the intake at the same time. then again the FSM wants the coolent drained to do almost anything



You do have to remove the intake when doing the header on an Inline 6. You cant get to one without taking off the other. There is no coolant passages on that side of the engine that are open. You might be thinking of the 2.8L V6 which would require you to.

Ryan

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'88 MJ ~6" Lift. 4.10 fr&rr, 33" Mud King XT