Minor knock sound from the engine, (1954 327 L-8)
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Quite a regular
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I suspect it is the stuck valve, or something similar on top of the engine due to lack of lubrication. This car sits for too long in the last 15 years at least. I only started to drive it like 2-3 months ago after wrapping up few other things in my hand.
It only makes such noise during idling in neutral. Under load either in drive or reverse there isn't such a sound. And it is warm/hot only, there isn't such a noise in cold start. None of the mechanics brought this up and no one said they heard anything suspicious. I bought a 16oz bottle of Marvel Mystery Oil today, poured most of them to the carburetor then fuel tank, the car ran quite smoother. But the sound of knock still exists so I bought a larger container (32oz) of Marvel Mystery Oil, poured half of those into the carburetor, and the rest to the fuel tank. After that, it still knocks a tiny bit. Is this something to be concerned, or given ~20oz of Marvel Mystery Oil is still in the fuel tank, the sound will likely disappear soon? (sorry about the super long link, I grabbed both audio files from Firefox page info window. Free users cannot share those audio files) Before the MMO, Before adding MMO After the MMO, After adding MMO to be honest, the iPhone 8 barely picks up the sound.....
Posted on: Today 20:31
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Re: Minor knock sound from the engine, (1954 327 L-8)
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Webmaster
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Try replacing a quart or two of engine with ATF and run it through a several heat up and cool down cycles without driving it and then change the oil and filter. You'll be amazed at the amount crap it flushes out of the motor. It really helped with my sticky rings after the car sat for 20+ years. Afterwards a long run with couple of quarts of Lucas Oil Stabilizer quieted everything down and helped reseat the rings.
Also you can pop off the side valve covers so you can observe if there are valves sticking, bent or misadjusted.
Posted on: Today 20:40
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-BigKev
1954 Packard Clipper Deluxe Touring Sedan -> Registry | Project Blog 1937 Packard 115-C Convertible Coupe -> Registry | Project Blog |
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Re: Minor knock sound from the engine, (1954 327 L-8)
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Webmaster
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You can idle it with the covers off and observe the valve action.
Look for ones that are not moving back down with their lifters.
Posted on: Today 21:48
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-BigKev
1954 Packard Clipper Deluxe Touring Sedan -> Registry | Project Blog 1937 Packard 115-C Convertible Coupe -> Registry | Project Blog |
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Re: Minor knock sound from the engine, (1954 327 L-8)
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Quite a regular
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Thanks for the tip. I am going to try this tomorrow and see
Posted on: Today 22:11
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