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By 55vickey - 15 Years Ago
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312, when I first tried turning it over with a breaker bar it would only turn about 7/8's of the way, either rotation, then it started going completely around with no problem but now it's hanging up in the same place again. My daughters firebird did that and it was a spun bearing, any thoughts on this before I tear the caps off. Gary
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By Hoosier Hurricane - 15 Years Ago
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Valve hangine open and the piston hitting it? Foreign object in a cylinder that moves from place to place? I dunno.
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By 55vickey - 15 Years Ago
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#'s 2 & 8 pistons are all the way up when its locked, all valves are ok, #'s 5 & 3 are all the way down and are just missing the crank throws. Looks like I might be tearing this down further than I planned
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By charliemccraney - 15 Years Ago
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Something in the distributor gear or oil pump?
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By 55vickey - 15 Years Ago
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The distributor is out, I was pumping oil to the rockers, right side was put together wrong but I've taken care of that and I'm getting some oil to the top now. I'm gonna try to see the chain for a problem. Gary
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By charliemccraney - 15 Years Ago
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Is it still in the car? Might it have something to do with the transmission?
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By 55vickey - 15 Years Ago
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engines out, on a start up stand. Just had the wife try to turn it with a breaker bar, I can slide a feeler gauge between the piston skirts and the throws, so it's not hitting there. It stops in the same place on the balancer no matter which way I rotate the motor
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By 55vickey - 15 Years Ago
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Just looked at all the rod bearings, # 6 looked a little suspicious but they all passed, although they are all in real bad shape. Did notice that # 5 piston is new, looks like it's not been run much, if at all, from the bottom it has no scoring or oil splashed up into it, super clean. Mains tomorrow
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By Hoosier Hurricane - 15 Years Ago
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Top ring on 2 or 8 hitting a ring ridge at the top of the cylinder?
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By 55vickey - 15 Years Ago
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Just pulled the heads, large deposit of carbon on the bottom edge of # 2 cylinder, couldn't see it thru the spark plug hole, not much of a ridge, engine turns over freely now, looks like a good 312, not sure if I'm gonna build it or sell it. Gary
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By Hoosier Hurricane - 15 Years Ago
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So it did come down to a foreign object on top of the piston. I wonder if it built up until it caused a knock, and the PO quit using it because of the knock. In the early '60s I worked at a buick dealership. Some of the customers driving high compression nailheads and never got over 20 mph would get knocks in their engines. The easy fix was to take them on the highway and run them hard and blow the carbon out. Once the service manager was going to fix a knock that way, but it must have had a cracked piston, because he blew the engine. He somehow got it covered under warranty, even though the car was out of warranty.
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