Black Smoke and Knocking

Posted by Jeff on June 05, 2002 at 17:37:45 from (207.140.225.163):

I just rebuilt the engine in my H - new connecting rod bearings, piston rings, and I had the head done by a reputable machine shop. The clearances looked good, and I retorqued the head after it was hot (and readjusted the valves). Two things are happening: 1. when I go from low throttle to high throttle I get a plume of black smoke for a couple of seconds; 2. there seems to be a "knock" that wasn't there before.

Do I need to adjust the carb to get rid of the smoke?

The funny thing about the knock is that I can only hear it if I'm standing on the manifold side of the engine, and I can't hear it three feet away from the engine. I also found part of the noise was the rain cap, so I took that off, but I still heard the sound. Since it sounded like a valve, I got a stethoscope and checked the valve cover; head on both sides front and back; checked the engine all around; checked the manifold; checked the oil pan; I couldn't hear it (the engine sounded fine inside). When I held my scope out in mid air behind the manifold AND between the manifold and back part of the valve conver, I could hear it. Any thoughts? I'm hoping that the engine needs to wear in a little, and it's nothing serious. Thanks.

Follow Ups:

• Re: Black Smoke and Knocking cd 19:42:37 06/05/02 (1)
  • Re: Re: Black Smoke and Knocking Jeff 05:56:27 06/06/02 (0)
• Re: Black Smoke and Knocking John 18:30:02 06/05/02 (1)
  • Re: Re: Black Smoke and Knocking Jeff Winkler 05:54:30 06/06/02 (0)

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