Posted by Mark - IN. on July 01, 2014 at 16:22:33 from (76.16.22.126):
In Reply to: 366 Engine posted by 4020 on July 01, 2014 at 11:04:29:
Well, if you are not sending oil out the push rods, you have a serious problem. The oiling operates this way on Chevys. Crankshaft operates the cam shaft, the camshaft operates the distributor, the distributor has a shaft in the base of it that drives the oil pump. Its possible, but unlikely that the shaft between the distributor and the oil pump broke or wore out, BUT its possible that the pin inside the base of the distributor shaft below its drive gear broke. Thats possible.
You didn't happen to lose, replace a worn or broken cam gear, did you? Nylon toothed cam gears were the biggest culprits of clogging the oil pump sump pickup screen when they break off, although metal ones can and do as well. The teeth on a cam gear break off, go down into the oil pan, get sucked up by the oil pump, clog the screen in the pickup, stop oil flow...and bad things happen...spun bearings, worn cam lobes, mushroomed lifters on their base, everything that moves internally inside of the engine gets damaged because oil isn't flowing through the engine passages to the moving parts.
Why don't you have oil pressure? Bad oil pump? Clogged pickup screen? Cam from a 1968 or older BB was inserted in a 1969 or newer BB using the newer cam bearings without solering their holes shut and redrilling at 3/16"?
If you got no oil to your lifters, its a short distance from your pump sump pickup to those lifters...pump, oil passages cast into the block, to the lifters. In the front of the block behind the timing cover are 3 plugs that are removed with allen head wrenches that run straight back to the back of the block. If my memory serves me correctly, at the back of the block they are plugged by freeze plugs. You pull the freeze plugs out, unscrew the allen head plugs at the front, and clean those passages out using a gun cleaning kit during a rebuild. At the back of the block, those 3 passages are tied to the passage fed directly from the oil pump, all cast into the block and machined for flow.
Its pretty simple. Oil pump sends oil up into its passage at the rear of the block. That passsage sends oil into the 3 passages that flow parallel to the cam, towards the front of the block. Those passages feed the cam bearings, crankshaft bearings, and the oil makes it to either the mechanical lifters, or into the hydraulic lifters to pump them up, either of which goes up the hollow push rods to lubricate the rocker arms, valve guides, anything that moves internally within the engine.
You have a blockage, or something physically broken that is stopping the pump from doing its job.
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