Originally Posted by turkeyhunter1962

I was recently asked about diagnosing an engine noise that soounded eerily like a lifter tap, but still remained after the lifters were replaced. To help others with the same issue I am posting my reply to that person here.

Sorry to hear that the noise is still there. I'll give you all the info I can think of and hope it helps. You did not mention how many miles you have driven the truck since you replaced the lifters so I will not assume anything.

There arethreeareas of the Magnum engine thatI can think of that make the same type of noise. I'll work from cheapest and easiest to check to most expensive and hardest fix.

1) The lifters - (reuse the valve cover gaskets & need mechanics stethoscope)
The easiest way I can tell you to check for a bad lifter is to use a mechanics stethoscope. Pull the valve cover on one side and then reconnect your spark plug wires. Start the engine and then place the tip of the stethoscope on the rocker arm bolt. The sound you hear from each bolt should sound the same. It will be very easy to tell if you still have one bad lifter. If you have not driven the truck much, I remember that it took a half hour or so of having the engine running before all of the lifter noise was gone. If you've driven the truck more than that the lifter should have fully pumped up on it's own.

Also, it is possible the lifter is good, but you somehow have a plugged oil passage feeding the lifter. Visually check the amount of oil being pushed up each pushrod into your rocker arms. It should look close on each rocker. If the loud one looks dry, then it's an oil feed problem. Possible oil passage, lifter, push rod, or rocker arm issue).

Do what you can during this testing to only run the engine long enough to make your diagnosis as some oil will get onto your exhaust manifolds and smoke. Do what you can to prevent that from happening too much. Also a hot engine is a bitch to work on.

2) Exhaust Manifold gasket leak. (New Exhaust Manifold Gaskets - $20 at NAPA & possible new manifold to exhaust system bolts)
I had a small exhaust manifold gasket leak that sounded just like a valve tap. Drove me nuts until I pulled the exhaust manifolds and saw the blown gasket. While diagnosing this one I even had a friend come over and listen and even he thought it might be a lifter. He's the one that had run into the exhaust manifold gasket problem before on a different vehicle.

I recommend spraying PB Blaster onto the cold engine exhaust manifold bolts and letting the stuff sit for an hour. Greatest stuff since canned beer. Take as much care as you can removing the exhaust manifold bolts as I've know people to break them in the heads. They are very easy to reach so also be sure to use a six point socket to prevent stripping the head.

Once the manifold is off, you should be able to see a black streak running from the exhaust port through the gasket to the outside if this was your issue. I could see it even though I broke the gasket taking mine off.

3)Timing Chain (Most expensive and hardest to do)
the Dodge magnum engines have a notorious habit of developing a timing chain noise that sounds like lifter rattle after a number of miles. To prevent this, Dodge manufactured a timing chain tensioner that replaces the factory thrust plate for the camshaft. It serves as the new thrust plate while providing tension to the timing chain and eliminating the timing chain noise. Be extremely careful doing this job to NOT move the crankshaft while the timing chain is off. If you do not move the camshaft or crankshaft while the timing chain is off, you will not have any timing issues once the truck is back together. BTW, you will have to loosen the oil pan gasket to do this repair, but the gasket is re-usable so unless a new one is included in your gasket set and you want to replace it, you do not have to.

I have attached bitmap files showing what each of these looks like. When I build my engine I installed one of these, but since you tackled the lifters I will assume that you understand engines some and can figure out how to do this job. If you do not havea copy of the 2001 Dodge Ram Service Manual I have it in zipped format I could attempt to send you. If you have high speed internet you should be able to download it and unzip it for your own use. The information in the manual is useful for all 2nd gen Rams and walks you through the necessary steps of timing chain/camshaft replacement which will tell you everything you need for this job. Not an easy job, but honestly it is not that difficult for a halfway competent mechanic with a nice assortment of tools.

I ordered my tensioner through Monicatti Dodge http://www.monicattichrysler.com/chrysler-dodge-mopar-parts.asp. I have purchased parts there before and they are very easy to deal with, usually have the parts on hand, and have some of the best prices on the net.

Depending on the mileage of your truck, you may consider a new double roller timing chain and gears but that's your call.

These are the 3 areas I can think of that would cause the sound that you are hearing. The mechanics stethoscope can help in diagnosing the sound if it is mechanical. maybe before pulling the valve covers you might want to use the stethoscope and do a general listen to your engine to see if anything jumps out at you. Listen on top of the valve covers over each cylinder, at each cylinder exhaust and intake port on the manifolds, through the intake manifold at the center front of the engine (timing chain), tensioner and idler bearings for belt, just anywhere you can safely listen while the engine is running.

Good luck and I hope this helps. While it is a pain to diagnose something like this it is also fun to be able to find it, fix it, and talk about it as having done it yourself when you are done.

If you have any other questions, feel free to contact me again. I'll try to help as much as I can.

Bob


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Originally Posted by Bug Out

pick up a stethoscope (Harbor freight) and try your best to narrow down where the tick/knock is coming from.

Originally Posted by JoshuaSulwer

stick your ear to the handle and the working end on the suspected parts of vehicle that may be making the noise.

Originally Posted by joshuasulwer1

Some people aren't as privileged...

Originally Posted by joshuasulwer1

Why are you even on this site?

Originally Posted by Mat Holland

Does anyone have a write up on how do the timing chain tension/chain replacement on the 5.2? I have a tick that comes around after the motor is warm and I suspect that it is the timing chain, but having a hard time verifying it. Used the old wooden broom handle on top of the valve cover trick and it doesn't seem like it is coming from there. I would think that if it was an exhaust manifold then it would be constant and not just after it has warmed up.

Anyway, never done a timing chain replacement myself. Helped a buddy with one on a demo van one time, but it had been smashed and half of everything was off already lol.

I'm not afraid to tackle it, just not sure what all needs to come off and what not.

Originally Posted by bargeman

Welcome to the DF. Start here 2nd Gen Ram FAQs, DIYs & How To's, Then scroll down to the Sticky, 2nd gen Sevice manual. That should get you started in the right direction.And one more thing, I gota ask this question cuz its on all our minds... Have you checked your plenum for a blown gasket?