Golden Jubilee
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Re: Disappointed - R112 (long post)
Long-distance diagnosis is SUCH an inexact science...
IHC in the early to mid-fifties.
Golden Jubilee
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Golden Jubilee
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waltesefalcon wrote:Do you know someone with a stethoscope that knows how to use it? That would be the best way to figure out just where your noise is coming from.
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cornbinder89 wrote:Noise can be a symptom, but not a diagnoses. I had a pick-up come into the shop I was working at with a bottom end knock. It had a 292 Chevy 6 and auto trans. The owner said his wife had driven the truck for 2 1/2 hrs on the hiway with the trans in "2" and not drive. She claimed it wouldn't go over 60 MPH.
I listened to the knock and concluded it came from the crank area, it wasn't until I pulled a few bearings to inspect that I found them all good! There was a definite knock from the oil pan, but it turned out to be a loose torque converter on the flex-plate.
You need someone who can not only know what to listen for, but who will follow through and confirm the diagnoses. In the case above, the owner had been warned it might need a new crank, and was over the moon to learn all it needed was a new flex-plate (the holes had wollowed out) and new bolts.
There are plenty of things that can make a noise, some have been listed, and some have not (carbon, sparkplug wires out of order etc)
Rod bearings tend to get louder as speed increases and the inertia in the rod causes it to knock at both ends of the stroke, mains tend to knock more a low speed. Bad main will wipe out the rod attached to it in short order,as it dumps the oil and little makes it through the drilling to lube the rod.
Golden Jubilee
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