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Old 03-11-2014, 08:41 PM
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i have a knocking sound rom the engin

Hi guys and girls its been a long a while
I have a wj 4.7L. I had the timing replaced a while ago and it ran like a dream but one day i went to start it and i heard a loud knocking noise coming from the engine i couldnt see any thing broken or flaping around so im thinking its a inteunal problem again.
Now when you start it there is a loud nock when you let the revs drop it calms down but any power put to the engine it gets louder .i checked the oil to see if there was any signs of metal or gunk it was clean from the last service any help would be apreacated
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Old 03-11-2014, 09:05 PM
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Re: i have a knocking sound rom the engin

You need to find out if the knock is coming from the lower end, or the head area. Do you have a mechanics stetoscope to pinpoint the trouble area? There could be a bearing going bad, but maybe even an exhaust gasket leak.
Maybe a soundclip could give us a better idea how it sounds.
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Old 03-17-2014, 02:56 AM
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Re: i have a knocking sound rom the engin

Ok I had a quick look and I could only hear the knock coming from the right side of the engine when I put some power into it
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Old 03-17-2014, 04:58 AM
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Re: i have a knocking sound rom the engin

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Originally Posted by IxIconvict View Post
Ok I had a quick look and I could only hear the knock coming from the right side of the engine when I put some power into it
id pull the valve cover off and see if a rocker arm came loose or has fallen, its a common issue with the 4.7
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Old 03-17-2014, 05:05 AM
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Re: i have a knocking sound rom the engin

How commen are we talking coz i got the timing done nit long ago and i would of thort they would of notice if any thing else was going
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Old 03-17-2014, 05:12 AM
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Re: i have a knocking sound rom the engin

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Originally Posted by IxIconvict View Post
How commen are we talking coz i got the timing done nit long ago and i would of thort they would of notice if any thing else was going
Id say 1 in 30 on higher mileage 4.7/3.7's. more of an issue on generation 1 4.7's. it is possible that they didn't properly torque everything
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Old 03-17-2014, 05:19 AM
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Re: i have a knocking sound rom the engin

1 in 30 i didnt know it was that bad odds
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Old 03-17-2014, 05:25 AM
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Re: i have a knocking sound rom the engin

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Originally Posted by IxIconvict View Post
1 in 30 i didnt know it was that bad odds
well I may have exaggerated some on that but it is an issue on higher miles 4.7's lol. theres plenty of youtube vids that show it
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Old 03-17-2014, 05:41 AM
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Re: i have a knocking sound rom the engin

Lol well its got 200k on the clock but iv been told to get it fixed no matter what but if its a commen problem its a good spot to start looking
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Old 03-17-2014, 05:47 AM
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Re: i have a knocking sound rom the engin

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Originally Posted by Strongjeff View Post
id pull the valve cover off and see if a rocker arm came loose or has fallen, its a common issue with the 4.7
Indeed it happens more often that a rockerarm falls of. This could happen if a hydraulic lifter fails, a valve stem sticks or (mostly after overheating) a valve seat dropped.
But in any of those cases the engine starts running rough, due to one cylinder not working anymore.
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Old 03-17-2014, 05:51 AM
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Re: i have a knocking sound rom the engin

So if say the arm come loose would it better to replace all lifters and rods
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Old 03-17-2014, 05:57 AM
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Re: i have a knocking sound rom the engin

Is the noise much louder when you start the engine? It sounds a bit as a hydraulic lash adjuster with too much play. But also knowing that they replaced the timing parts, i wonder if that has anything to do with it. Pulling the valve cover and checking each rocker for excessive play would be my first step.
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