3.0 Tapping Noise

[81dmc]

So I have about 150 miles on the engine now and I pulled the oil cap to find this. Running MTC rockers. Pictured is an intake lobe.

Is it me, or does this cam looks no bueno?
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[Delorean Industries]

Would appear to be a wear issue. Pull covers to inspect further.

[81dmc]

https://www.youtube.com/shorts/uvhvsXOtvx4

Quite a bit of leakage past #6 exhaust valve. What you all think? Does it seem excessive?

I don?t know about automotive, but on aircraft engines, we usually punch the valve and worse comes to worst, we lap it to remove these kind of leaks.

[Jaybaybay]

Punch the valve? what does that entail? You're also sure the lobe for that valve is on the closed portion? Where are you located in FL?

I also should've reread your earlier post about the history of your engine, mine also came from a junkyard and had a little bit of leak down before running. Others online chalked it up to slight corrosion on the valves/seats and said from other junkyard engines to just let it rip. I figured what the hell If it doesn't work then I would just take it apart but so far so good. Haven't verified my numbers were better but it runs great to me.

[81dmc]

Punch the valve? what does that entail? You're also sure the lobe for that valve is on the closed portion? Where are you located in FL?

I also should've reread your earlier post about the history of your engine, mine also came from a junkyard and had a little bit of leak down before running. Others online chalked it up to slight corrosion on the valves/seats and said from other junkyard engines to just let it rip. I figured what the hell If it doesn't work then I would just take it apart but so far so good. Haven't verified my numbers were better but it runs great to me.

Punching means tapping the valve open from the top to see if carbon is preventing the sealing. If that doesn't work, lop the paste in and start spinning. Of course, I can't do that without pulling rockers which means pulling engine?

My heads were O/H by a reputable machine shop in Houston, so it shouldn't be leaking, but of course sh*t happens.

[81dmc]

So it?s obvious, even though I have an ?exhaust leak?, it doesn?t leak while running.


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So leaky #6 exhaust valve causing tapping? At this point, I don?t know what?s going on anymore.

[81dmc]

So I've come to the conclusion the exhaust side tick is combustion noise. The RH no longer does it as I wrapped a couple pipes to protect oil filter and alt from extreme heat. And that exhaust valve went away after tapping with hammer while cylinder was pressurized.

Also, my valve train tick/tap is slowly going away as it breaks in.

As for the marks on the cam, I found they are just shiny areas. I ran my fingernail over it and was unable to feel any damage.


So I guess good for now.