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jeeptyler 09-15-2013 09:15 AM

01 wj 4.0 knock
Okay, so I have this knock at idle whem warmed up. Its sounds mostly like a rod knock. I have good oil pressure. The knock gets a little but louder as the you hit the throttle no load. And its really hard to tell if it gets louder if your in gear. But it does alway happen at idle when warmed up. When I pulled the pan there was no metal shavings in the pan and no debris in pick up screen. The timing chain did seem lose. Should I be worried or just keep driving it

j-rod17 09-15-2013 09:39 AM

does the knock increase with RPM?

nickblack 09-15-2013 09:58 AM

When you had the pan off, did you try rocking the bearing caps back and forth by hand to see if there was any play? It isn't that hard, once the pan is off, to remove the caps and check the bearings.

COL 09-15-2013 09:58 AM

He said yes it does when there is no load on the engine like when in park or neutral. He said it is hard to tell when it is in gear.

jeeptyler 09-15-2013 12:05 PM

I also checked side to side cleance with a feeler gauge and it was in spec I also took a couple bearing caps of and they look good. I have read and been told its something they do.

KayCeeJeep 09-15-2013 02:17 PM

This is a long shot but what oil are you running? Reason I ask is I tried 15w40 in mine once and it was so thick it made a noticeable knock even warm. I thinned the oil and it disappeared. Have not run a 15w40 since nor has the knock ever returned.

You said you had good oil pressure, curious what you're actually getting.

nickblack 09-15-2013 02:34 PM

That is an excellent point KC, let us know what your running. The fact that your bearings look good and the clearances are also good, it very well could be the oil.

j-rod17 09-15-2013 06:04 PM

i bought a Jeep that was to have a bad motor. made a knock noise when running but no change when RPM's up. also went away a time or two. ended up being a bad torque converter and loose flex plate bolts in mine.

started with a knock then turned to vibration once i tightened the flex plate bolts. guess it let the TC issue show then

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