Ruh roh Raggy! I hear you knocking…

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idahovette

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Is it a metal or plastic cover? Oh sh!t never mind it's a manual!! duh oh...read and comprehend, right??!!!
 
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JBswth

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Disco said:
@JBswth, it was the inspection cover, apparently. They pulled the cover to check inside the bell housing area, found nothing of concern, put the cover back, started the engine to use a stethoscope to track the sound, and the sound was gone.
The only thing we can think is the cover was put on in just the wrong way that something inside the bell housing, something spinning at crank speed, was tapping it. I have had the engine running several times now, and the noise has not returned.
Click to expand...
That's good, maybe something was in there and fell out unnoticed.
 
Matt Lutz

Matt Lutz

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So funny this thread is goin on. I have a 81 GMC with a 250 6cylinder. The motor is not the original. I was having an issue with the carb flooding and thru some advice from a mechanic I added a fuel regulator. After a few runs the engine started knocking really bad but it goes away at high speeds. And I am not trying to take over the thread just similar issue.
 
Disco

Disco

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Mike
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1978
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Big 10
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350
Matt Lutz said:
So funny this thread is goin on. I have a 81 GMC with a 250 6cylinder. The motor is not the original. I was having an issue with the carb flooding and thru some advice from a mechanic I added a fuel regulator. After a few runs the engine started knocking really bad but it goes away at high speeds. And I am not trying to take over the thread just similar issue.
Click to expand...
He had you add a fuel regulator on a carb? I would suspect a needle and seat or a float if a carb is flooding, unless you added an electronic fuel pump with a higher output that the mechanical pumps. If you are using a mechanical pump, the needle and seat should be enough to stop fuel flow, as long as everything is working properly.
 
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