Tapping Sound after replacing headgasket - Defender Source
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  #1  
Old April 4th, 2010, 10:38 AM
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Brian Jones
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Tapping Sound after replacing headgasket

I just got the headgasket replaced about a week ago and since having it done i am hearing a whole new tapping from the the motor. It does it after warming up and is subtle enough that you would let it pass. I hear it the most when downshifting. Since the heads were shaved at a machine shop, you think the sound would be a tappet? i know it isnt a lifter. It sounds isolated and follows the revs of the engine. Other than that the truck runs perfectly fine.
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  #2  
Old April 4th, 2010, 12:46 PM
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Could be a valve also, or a rocker arm, or a valvespring. Also possible that it's an exhaust leak somewhere. Lots of little possibilities to track down unfortunately.

-Hans
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  #3  
Old April 4th, 2010, 02:50 PM
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9/10 it is a rocker arm. When people do heads they clean the gunk off them and then they tap.

Take it back and complain.
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Old April 5th, 2010, 08:12 AM
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Hi Brian, if the heads were stripped and cleaned Ron is spot on, also the rockers and pushrods would have worn in together it may be it was reassembled with the push rods and rockers mixed up in this case it causes rattles as the wear spots don't match, the same thing is caused by mixing new and old parts.

you may find it clears up as the wear will rapidly even out, keep a close check on oil and filter changes as disturbed crud will be floating about

I have also seen the hard steel wear pad on the rocker arm come loose and cause a sound like a double tap, similar to a train running over a rail joint... cue boxcar willie train whistle.

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Old April 5th, 2010, 08:15 AM
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I had the same thing happen on my Range Rover, my new cleaned rocker assemblies with old non mated push rods and its making a ticking noise. It would also have to be the rocker on the DS thats a bitch to get too.
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Old April 5th, 2010, 08:28 AM
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I have the same thing with mine after I put in new heads. Is this something to be concerned about? or will it clear up after a bunch of miles?
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Old April 5th, 2010, 06:23 PM
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If the sound sticking around by the weekend, I am going to run it back up to the shop. It is hard for me to figure out exactly where it is coming from. It doesnt sound like its in the top end. I hear it best under the truck, which I thought was a little strange.
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