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Old 06-15-2010, 02:28 PM   #1 (permalink)
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Question Engine Knock

At my 390 FE I got this Motor sound. I renewed the Timing Chain and the Sprockets. When I drive there is no Knock or Noise. Also no knock or Noise in P with my Tranny.

But when I drove a while and stop near the Garage in Position D with the Feet on BrakePedal I have this Scenery.....

What would you say? Piston Slap? Road Knock? A Lifter Thing?, Pushrods? Any Tips welcome...

Oliver from Germany


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Old 06-15-2010, 02:39 PM   #2 (permalink)
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Re: Engine Knock

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Originally Posted by Galaxian View Post
But when I drove a while and stop near the Garage in Position D with the Feet on BrakePedal I have this Scenery.....

The word "scenery" is not really translating properly. Can you try another description?
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Old 06-15-2010, 02:46 PM   #3 (permalink)
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Smile Re: Engine Knock

I mean Diagnosis. When Machine has warm up and I want to stop in Transmission D with Foot on the Brake Pedal this Diagnosis occurs...

Knock in an unrythmic Kind. I would deny a exhaust Prob.


Olli
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Old 06-15-2010, 03:21 PM   #4 (permalink)
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Re: Engine Knock

The best way to diagnose a suspected engine sound, in my opinion, is to start with the vehicle in park engine running. This eliminates other components. I like to start with the engine cold and listen to it as it warms up. A stethoscope is the best tool for this. Listen at idle and also reved up. A good rule of thumb for searching these sounds is, a knock is usually low end and a tap is usually top end. Hope this helps.
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Old 06-15-2010, 04:01 PM   #5 (permalink)
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Re: Engine Knock

If you have an internal engine knock 99% of the time it will get worse with increased engine speed. But we need to find out if it is top end or bottom end. You can use a screwdriver tt your ear to find the general area of the noise.

And just general questions

when was last oil change, what oil,how much?

You may want to take belts off of all accessories and see if noise is still there.

All I can do for now withot hearing the noise myself, good luck buddy
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Old 06-15-2010, 04:09 PM   #6 (permalink)
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Re: Engine Knock

Quote:
Originally Posted by Galaxian View Post
At my 390 FE I got this Motor sound. I renewed the Timing Chain and the Sprockets. When I drive there is no Knock or Noise. Also no knock or Noise in P with my Tranny.

But when I drove a while and stop near the Garage in Position D with the Feet on BrakePedal I have this Scenery.....

What would you say? Piston Slap? Road Knock? A Lifter Thing?, Pushrods? Any Tips welcome...

Oliver from Germany


YouTube - Pornolly's Channel
Is the noise that you are describing at :07 seconds and :11 seconds in the video? The noise is a fast knocking noise?

Frank
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Old 06-15-2010, 04:23 PM   #7 (permalink)
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Re: Engine Knock

When you replaced the timing chain did you remove the spacer between the cam and cam gear,if you leave it on the thing that fuel pump rides on will hit some ribs cast into the timing chain cover and make a knocking noise.
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Old 06-15-2010, 04:27 PM   #8 (permalink)
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Check the flywheel to converter bolts.
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Old 06-15-2010, 04:45 PM   #9 (permalink)
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Re: Engine Knock

My interpretation is that the knock is only heard when idling in gear. The knock is not there when idling out of gear, like in Park, or Neutral. The difference between these situations is that the idle speed is slower when in gear and from my own experience that engine may move around more when the idle is that slow. Before my engine rebuild I had this very experience and I would get knocking, or banging from sounds from various locations as a result of the engine bouncing around at the low idle speed. It was fine out of gear and if I sped the idle up with my foot on the gas and the other on the brake.

Open the hood and watch the engine while you idle it in gear, or have someone else in the car while you look closer and you may see what is banging together at that low idle condition.
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Old 06-15-2010, 07:56 PM   #10 (permalink)
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Re: Engine Knock

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Originally Posted by 6Dsick View Post
If you have an internal engine knock 99% of the time it will get worse with increased engine speed. But we need to find out if it is top end or bottom end. You can use a screwdriver tt your ear to find the general area of the noise.


It will point out as to where the noise is coming from, but unless you have heard a good and a bad engine running, you still do not know as to where exactly the noise is comng from. The clatter we hear (I use and old 1/2 inch wood dowel) may be normal, but to the untrained ear the whole engine is due to explode soon.

Wm.
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Old 06-15-2010, 09:11 PM   #11 (permalink)
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Re: Engine Knock

For 10 or 15 bucks you can purchase a stethoscope and easily pin point the sound. Then you can determine what needs to be done to source the problem. For example you hear a low end knock, place the stethoscope on the oil pan, determine that is where the sound is coming from you drop the pan, check the bearings and find a bad rod bearing. This is the easiest way to diagnose a problem like this.
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Old 06-16-2010, 04:55 AM   #12 (permalink)
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Re: Engine Knock

What is your Park idle rpm? I have a tapping lifter sound, maybe 4 per second at 600 rpm. Since I began a treatment with CD2 it has been getting better, Now it usually goes away when the engine gets over 1200 rpm.
putts
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Old 06-16-2010, 02:43 PM   #13 (permalink)
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Re: Engine Knock

It wouldn't hurt to go ahead and re-torque all of the lifters.
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Old 06-17-2010, 09:11 AM   #14 (permalink)
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Smile Re: Engine Knock

Thanks Folks for all answers. The Stethoscop Thing would be right to detect the Prob.

I have NO Noises or Tap or Klack when I drive. In higher Idle speed (in P for example) when Machine is warm I do not hear any Noise...

But when Machine is warm after a Ride and then I stop: I hear this Knock.

If a Bearing fails.... Crankshaft or Camshaft for example.... Which Noise would this make?

I think a Lifter failure would have a different Sound....!!???

The driving Performance is not poor...I do not know ..but I hope that my Prof Mechanic has done the thing with the Timing chain and Sprockets correctly...
Ok - will play Dr. Ford and see if the Patient has to die or not.... -)

Thank you for help Guys.....

Olli from Cologne-Germany
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Old 06-17-2010, 12:46 PM   #15 (permalink)
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Re: Engine Knock

This does seem to confirm my interpretation of when the sounds are heard. I think the source of the knocking is external to the engine and trans and the result of engine movement at low idle speeds. When my car was doing this one source for the sound was the console shifter, another was the stove pipe from the passenger side exhaust manifold to the snorkel on the air cleaner. I also had the transmission fluid lines to the radiator banging around and one eventually wore through from rubbing on the crossmember, or frame. Eliminate all the simple things, the external things, the easy and cheap things, before looking into internal components and adjustments.
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