Thread: Jeep 4.0 I-6 Question

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Could it have rolled back far enough that the oil pump, while turning backwards, pumped all the oil out of the pump, pickup, and tube, then when you started it you had a bit of cavitation to overcome??

Originally Posted by Dave Severson

Could it have rolled back far enough that the oil pump, while turning backwards, pumped all the oil out of the pump, pickup, and tube, then when you started it you had a bit of cavitation to overcome??

I had not thought of that and it sounds reasonable, but while it was knocking I looked at the oil pressure gauge and it was normal, if not a bit higher than normal which I attributed to it being cold and me revving it a bit. I've never seen anything like this before.

Originally Posted by rspears

I had not thought of that and it sounds reasonable, but while it was knocking I looked at the oil pressure gauge and it was normal, if not a bit higher than normal which I attributed to it being cold and me revving it a bit. I've never seen anything like this before.

So this must not make sense to anyone else, either. It started quiet again this morning, so I guess I'll just chalk it up to a coincidence and remember the date. Earlier in the day I had swapped out a leaky radiator, put on all new hoses, and changed the oil & filter. Nothing done would lead to lifters leaking down, which I'm assuming is what happened. Oh well.....