6 bolts.
No need to mark the crank/balancer bolt or anything else.
You can reach all the bolts by removing the inspection cover and turning the motor over. If I remember correctly I was able to lay in position under the Jeep where I could deal with the bolts and then just reach up turn the engine with the wrench without moving out of position.
It was probably a 15 minute job. Real quick and easy.
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