My last oil change I hear a light tapping sound - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 8 (permalink) Old 08-20-2011, 06:57 PM Thread Starter
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My last oil change I hear a light tapping sound

I have a 2006 Jeep Commander 5.7L Hemi, and on my last oil change, I had the truck on the lift checking for leaks and I could hear a light tapping sound coming from the engine.... Vehicle only has 59,000 miles on it. Could this be my worse fear,,,, a rod knock? or something else? Seems it only does it at a low idle and doesn’t matter if it’s hot or cold. If I rev it up a bit or drive it under load you can not hear it. it's as if it goes away. But resting at idle you can hear it.

Thanks!!
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Last edited by CaliforniaDad; 08-20-2011 at 07:00 PM.
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post #2 of 8 (permalink) Old 08-20-2011, 09:30 PM
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I don't think any of the Hemi's on the forum have ever had a rod knock.....with the exception of those that got the intake under water.

In general, a rod knock due to excessive bearing clearance will be almost imperceptable at cold idle......a bit louder at operating temperature, due to oil thinning, and increase in volume as RPM's rise.

At idle, under the vehicle, any normal engine noises will amplify due to the body metal around the block, oil pans can amplify normal engine sounds as well.

Anyways, I doubt if you have any cause for concern.

Rob


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post #3 of 8 (permalink) Old 08-20-2011, 10:04 PM
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I think that is the infamous HEMI "tick" you are hearing.

2006 Steel Blue 5.7L HEMI Limited 4x4 Build Date: June 9, 2006 Hour 14
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post #4 of 8 (permalink) Old 08-20-2011, 11:34 PM Thread Starter
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Quote:
Originally Posted by jeep5253 View Post
I think that is the infamous HEMI "tick" you are hearing.
Oh really..The HEMI's have a infamous "Tick" what is the cause of it?
Thanks!!
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post #5 of 8 (permalink) Old 08-21-2011, 12:36 PM
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Quote:
Originally Posted by CaliforniaDad View Post
Oh really..The HEMI's have a infamous "Tick" what is the cause of it?
Thanks!!
I don't know what causes it but some say it is the injectors. If you google hemi tick you will find some discussions about it,. Also, if you put hemi tick in the search on youtube you will get some videos about it.

2006 Steel Blue 5.7L HEMI Limited 4x4 Build Date: June 9, 2006 Hour 14
Interior: Dark Slate/Light Graystone with Saddle Brown Leather Seats
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Last edited by jeep5253; 08-21-2011 at 11:36 PM.
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post #6 of 8 (permalink) Old 08-21-2011, 08:17 PM Thread Starter
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Oh yeah...I did the youtube search. Sure enough. thats the tick. Mine goes away when you raise the RPM's to.
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post #7 of 8 (permalink) Old 08-22-2011, 12:10 PM
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The Evap/Purge system has a solenoid purge valve, that could be the cause.

The Injectors like suggested.

Don't rule out valvetrain noise, the Hemi's have a pretty tortured valvetrain, the 3rd Gen Hemi's improved it by moving the CAM much higher up in the block, the earlier Hemi's breaking valvetrain parts was very common. Don't really know, just offering some suggestions. Valvetrain noise would change in frequency with the engine rpm, injectors should also, purge solenoid valve would NOT.


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post #8 of 8 (permalink) Old 09-02-2011, 08:28 AM
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What oil filter was installed during the last oil change. The Orange FRAM filters should be avoided like the plague, they use cardboard endcaps on the filter cartridge. Yes, in most cases the poly impregnated cardboard lasts and does NOT come apart, but, the anti-drainback valve seals against the cardboard end caps, and cardboard seals very poorly. More than few engine have suffered excessive wear in the valvetrain from dry start-ups from using those filters.

BTW, rod knock can be caused by a spun bearing, but for most engines that only happens after a serous oil problems, like no oil at all. A spun bearing would knock at idle, I think its far more likely your problem is something different that. It may be the normal hemi tic.


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