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Engine Which harmonic balancer for Hesco 4.2l EFI upgrade?

Engine Which harmonic balancer for Hesco 4.2l EFI upgrade?
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Brad88yj

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1983 jeep cj7
I recently got a Hesco EFI system upgrade for my 83 AMC 258 i6 / 4.2l from a friend but didnt come with the harmonic balancer. Do you need to use the V belt balancer from Hesco or will one from a 4.0l work the same?
 
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Did you contact Hesco ?
 
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Brad88yj said:
I recently got a Hesco EFI system upgrade for my 83 AMC 258 i6 / 4.2l from a friend but didnt come with the harmonic balancer. Do you need to use the V belt balancer from Hesco or will one from a 4.0l work the same?
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What model # kit? As long as you have not changed any engine internals your balance needs are the same. Does the engine now need a crank trigger?

I searched hesco.us and I can't find any full / complete EFI kits.
 
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Hesco doesn’t make those kits any longer because from what I heard was a lack of computer controllers. I have a friend that actually bought their test stand engine and installed it in his Scrambler.
 
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CJ said:
What model # kit? As long as you have not changed any engine internals your balance needs are the same. Does the engine now need a crank trigger?

I searched hesco.us and I can't find any full / complete EFI kits.
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No internals will be changes but yes there will be a crankshaft position sensor installed.

image.webp
 
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I can't answer that without having a manual. Can you attach it?
My thought is it might be because you may have modify your balancer to attach the trigger or something like that.
 
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Hesco’s balancer has notches that are necessary in order to trigger the crankshaft position sensor. I believe the 4.0 engine picked up the crankshaft position from the flywheel/flexplate.
 
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Patrick said:
Hesco’s balancer has notches that are necessary in order to trigger the crankshaft position sensor. I believe the 4.0 engine picked up the crankshaft position from the flywheel/flexplate.
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I thought it had to do with the CPS...
You need to come up with your own way of triggering the CPS if you do not use their balancer.
 
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Friend of mine tried machining a stock balancer to read - didn't work. If you can still get their balancer its a no brainer to buy it - just hope its still available.
 
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You either need to use the Hesco balancer, as others have stated or you will need to use a 4.0 flywheel they have the correct slots cut to engage the fuel to the system. The 4.0 and AMC 258 i6 / 4.2l are both internally balanced so it doesnt hurt to swap them. If you do have to use a 4.0 flywheel its a good time to consider an AX15 swap.
 
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Hesco has this balancer available for 4.0 engines. It's pricey though - at $359. Hesco Link

balancer.webp

Quadratec also has it, but wants $399 for it. Quadratec link

balancer_2.webp
 
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I purchased a 1984 CJ7 4 or 5 years ago with a HESCO AMC 258 i6 / 4.2l EFI conversion kit installed but not functional. I was able to talk with the guys a HESCO who directed me to the engineer that designed the kit - after several phone calls of me asking goofy question while trying to find missing parts he told that the kit is assembled from parts from a 1994 YJ with a few exceptions. I was told that if I needed parts to go to Rockauto and purchase them.. The VSS sensor is from a Durango I will have to check the year and 3 or 4 other parts that HESCO produced. I have the installation manual, packing list, trouble codes, and trouble shooting tips. I am more than happy to share them with you if that will help.

I ran it for a couple of years then rebuilt the engine swapped the cam & head... I replaced the HESCO (Mopar) ECU with a MegaSquirt 3 w/MS3X expansion to have a more flexible system along with sequential fuel & coil on plug ignition.

The HESCO system is a very nice system that will serve you well. If you need any of the documentation or have questions I am happy to offer what I have.

Garner
 
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RattleTrap said:
I purchased a 1984 CJ7 4 or 5 years ago with a HESCO AMC 258 i6 / 4.2l EFI conversion kit installed but not functional. I was able to talk with the guys a HESCO who directed me to the engineer that designed the kit - after several phone calls of me asking goofy question while trying to find missing parts he told that the kit is assembled from parts from a 1994 YJ with a few exceptions. I was told that if I needed parts to go to Rockauto and purchase them.. The VSS sensor is from a Durango I will have to check the year and 3 or 4 other parts that HESCO produced. I have the installation manual, packing list, trouble codes, and trouble shooting tips. I am more than happy to share them with you if that will help.

I ran it for a couple of years then rebuilt the engine swapped the cam & head... I replaced the HESCO (Mopar) ECU with a MegaSquirt 3 w/MS3X expansion to have a more flexible system along with sequential fuel & coil on plug ignition.

The HESCO system is a very nice system that will serve you well. If you need any of the documentation or have questions I am happy to offer what I have.

Garner
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Great post! Can you scan the documentation?
 
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I have digital versions of all of the documentation - let me know where you'd like it posted. I am thinking a HESCO Section in the Downloads... ???

The damper I used is Mopar Part #P5249688 which I see is no longer available. However I think the HESCO part #HES9199ED is the same part (few extra bucks)... If you have a V-belt instead of a serpentine belt you will need Mopar part #P5249687 which is still available plus a crank sensor & mounting bracket if you do not have them as part of your kit...

Garner
 
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RattleTrap said:
I have digital versions of all of the documentation - let me know where you'd like it posted. I am thinking a HESCO Section in the Downloads... ???

The damper I used is Mopar Part #P5249688 which I see is no longer available. However I think the HESCO part #HES9199ED is the same part (few extra bucks)... If you have a V-belt instead of a serpentine belt you will need Mopar part #P5249687 which is still available plus a crank sensor & mounting bracket if you do not have them as part of your kit...

Garner
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You can attach them to this thread, put them here -->> https://jeep-cj.com/community/downloads/categories/powertrain.5/ or email them to me and I'll put them where they belong (in your user name.) It's nice that you have the documentation to share.

admin@jeep-cj.com works for me email
 
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