My 4bt jeep project

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F360 said:
That's great. I love it when my kids come out and spend time with me in the shop.
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My youngest loves the shop and the John deere brand more than anything right now :cool:

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A lot of good work you got going on. I have a 98 tj with just about everything done to it except a 4bt swap. That'll be next

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We got an hour to work on the upper strut today

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We are back on the jeep project after spending a lot of time deployed, the motor runs strong and has been removed to work on the chassis a little more
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Machined the crank sensor pulse pattern into the 4bt cummins harmonic balancer so the stock jeep tj tach will work
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The TJ tach is also going to require an input from a Cam position sensor to work. Its a half moon (50/50 signal) running at cam speeds or 1/2 crank. On the 4.0l it is where the distributer would have been but they still needed to drive the oil pump so the sensor was used to drive it.
I didn't get around to it before my build became a rebuild but I had tried tying the signal wires to the crank sensor (jeep flywheel) which you have simulated, and I got a working tack about 20% of the time. It all depended on where the crank stopped when running. Apparently the TJ ecu only looks for that cmp signal for the first 6 seconds at startup. If it sees what it wants, the tack works, if not...no tach.
 
Since the he221w is a t25 flange and did not have any thing on hand I made some parts to get it to work
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