91 ranger 2.3l piston slap or rod bearing

[lancehillhouse]

about four weeks ago my oil pump tube got clogged with a dry rotted gasket so i took it off and replaced it. still leaks but now its knocking but i cant figure out which it is. i think its a rod bearing. i took video so any help will be greatly appreciated.

 

[RonD]

Unhook intake side spark plugs(coil)
Start engine
With engine idling and knock being heard
Unplug one spark plug wire, on exhaust side, at a time, yes engine will miss, but if knock goes away then that cylinder is the one with spun rod bearing, if knock doesn't go away then it isn't a rod bearing noise.

Rod bearing makes the "knock" sound when that cylinder fires, just before firing the crank has started to pull the rod/piston down, this leaves a gap between rod and crank.
Firing causes these two metal parts to SLAP together, that's the "knock" noise.
If you stop cylinder from firing, knock stops as well.

 

[lancehillhouse]

alright thanks for the reply. i will try that in the morning. i was in the middle of doing a compression test on the cylinders today but i left my keys in the ignition and went to oreilly's to get the ford adapter(i got a ride) and when i came back battery was dead. tried jumping it with my wifes car but the damn battery wont charge. are jumper cables supposed to have resistance? it was only 1 ohm but that might be the cause of the battery not charging. anyways thank you RonD and will let you know what i find tomorrow