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  1. R

    4.0 serpentine belt problem

    My serpentine belt keeps jumping track on the harmonic balancer (towards to the engine block) Causing it to rub and eventually break apart. The HB has been replaced a few months ago. By looking at it running everything looks straight and in line and normal.. :scratchhead: Anyone else have...
  2. R

    Yj No spark after random engine shut off.

    I tried to drive my jeep just now and It started up and ran for like 3 seconds, then shut right off with no sputter. I've drove 300+ miles since I've done motor and tranny swap and went wheelin a few times. Pulled #1 spark plug to check for spark and none. This sound like coil or distributor...
  3. R

    Bad squealing 4.0 I6

    Just swapped a newer 4.0 to my 92 yj and am using my old PS pump/alt, running no AC. Have brand new serpentine belt on and it's tight. I'm getting an ear piercing squeal noise from somewhere.. belt slipping on bad pulley? I replaced water pump and idle pulley still squeals super loud. Gonna try...
  4. R

    4.0 I6 Swap

    My Yj's motor/tranny are on their last leg (engine noise and little oil pressure/ lost 3rd and losing 2nd). Putting in a another 4.0 I6 and ax15 this weekend. There any common mistakes people make while doing this? I have a repair manual but looking for advice from peoples own experiences. My...

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