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Tractor Talk Discussion Forum

O.T. '97 JEEP CHEROKEE ENGINE NOISE

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Kevin (FL)

04-18-2006 10:24:15




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Hey guys--been out of touch and unable to do much posting--still doing Ivan, Dennis & Katrina work between FL & MS and also trying to make a living and pay the bills too. Our 4 Liter, Cherokee engine is making a noise that sounds like a rod knocking. It's not a real loud knock and sometimes it can't be heard. A few facts about the engine: Mileage 130K, dealer serviced by previous owner and I've changed oil & filter at 3500-4000 mile intervals. Engine runs smooth as silk and oil pressure maxs out at 40 pounds on the gauge and will drop to 25 or so at idle. While running, I pulled one plug wire at a time and the noise remained for each wire pulled. (This sorta tells me that it's not a rod.) I've looked at all the pulleys and listened to each with stethyscope and the water pump bearing makes the most noise with power steering pump coming in second. I also listened to all 6 exhaust and intake ports with the stethyscope and none of the cylinders sound any noisier than the others. The noise is definitely on the engine and is not related to drive train as it happens while not rolling.

Last night I looked underneath the engine at the harmonic balancer and I did see where the balancer appears to be "kissing" or "skimming" the forward lip of the oil pan. No sparks are showing but it looks like the balancer and pan may be touching at regular points around the rotation.

So with all that said, does anyone have any words of wisdom as to what this could be?

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Badly Bent

04-19-2006 04:11:45




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 Re: O.T. '97 JEEP CHEROKEE ENGINE NOISE in reply to Kevin (FL), 04-18-2006 10:24:15  
I've got a '98 Cherokee with 4.0 engine that has had a slight knock at idle since it was brand new. The knock is erratic and I haven't been too concerned about it since it has never gotten worse. Once the RPM's turn up to over 1000 or so the knock either goes away or is masked by the increased engine noise. This engine has always had less oil pressure than I would like, but it is within Jeep specs. I'm not going to spend much time worrying about it unless it becomes more severe. FYI, my brother had an engine in an old Ford pickup that knocked for over 200,000 miles. We never did find out what caused it, but the last I heard the engine was still running. Tim

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Bryan in Iowa

04-18-2006 19:18:53




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 Re: O.T. '97 JEEP CHEROKEE ENGINE NOISE in reply to Kevin (FL), 04-18-2006 10:24:15  
I'd check for broken flex plate, pretty common on these , or pry balancer forward and then back ,,see how much end play you have , may be thrust main going bad



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frankiee

04-18-2006 15:37:35




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 Re: O.T. '97 JEEP CHEROKEE ENGINE NOISE in reply to Kevin (FL), 04-18-2006 10:24:15  
At a time when you can hear the "knock" ,then shut off the engine and turn the ignition key to the "run" position just before the engine stops, so that the engine resumes running again. Do this several times for consistency. Do you hear the knock when you do this??? This is to guess at the condition of the flex plate.
Also, on a cold start, cycle the engine between idle an about 2000 rpm every second. That is to put some load on the crank to guess at the condition of the main bearings and in particular, the thrust bearings. Is the knock gone or quite pronounced when doing that???

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Bob

04-18-2006 10:41:25




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 Re: O.T. '97 JEEP CHEROKEE ENGINE NOISE in reply to Kevin (FL), 04-18-2006 10:24:15  
Failed harmonic balancer?



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