Strange knocking from #8 area..
04-30-2006, 04:40 PM
#11
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Re: Strange knocking from #8 area..
Hmmm, I suppose that may could be the trouble. After I rule everything else out I will throw the old lifters in and re-assemble with cheapy gaskets. If noise is gone that was it.
04-30-2006, 08:59 PM
#12
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Re: Strange knocking from #8 area..
Originally Posted by BadDog
The noise is not directly timed to engine RPM. If you hold rpm steady at fast idle the sound is consistent. Blipping the throttle would increase the rate but it sounded like at certain points during rpm increase or decrease it would go away momentarily or change its pitch.
That sounds like it could easily be a rod bearing too. Have you cut the filter open to see if there is any bearing material in it ? Rod bearings usually will not affect oil pressure when they first start to fail. Wrist pins or a loose skirt will usually not start all of a sudden, even though it can happen.
Did your machine shop install seats in the heads ? I have done 4 pair of 502 heads this spring and none of them needed seats, they were about the hardest material I have ever seen. Could be a valve sticking when hot, but you probably should have been able to pick that up with the scope on the valve cover.
Bill Koustenis
Advanced Automotive Machine
Waldorf Md
05-01-2006, 11:54 AM
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Re: Strange knocking from #8 area..
My bet is a valve guide has gone bad, if that is the case, be sure to replace that valve also, because they get to rocking around and are prone to break off a piece of the valve or the whole mushroom, and that gets real ugly.
05-01-2006, 01:56 PM
#16
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Re: Strange knocking from #8 area..
Head is at the machine shop now. Never heard a noise that could not be determined after a few beers. Those that heard it were split between rod, lifter, skirt, broke ring and where is the beer. I will find it...
The cooler that is.
The cooler that is.
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05-15-2006, 05:33 AM
#20
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Re: Strange knocking from #8 area..
Yup, caught it just in time. The rod bearing was spun but still there. Part of the bearing was hanging out and hitting as the crank turned. Getting new Eagle I beam rods and turning crank. Upgrading to forged pistons while it is down. Sucks that this had to happen in the spring. Should have took it out over the winter but everything seemed fine last fall. Good oil pressure and no noise.
