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10-01-2002, 01:53 AM
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No oil to rockers
Our fresh big block chevy has ~65 psi of oil pressure at idle, hydraulic cam, but the rockers are not pushing oil out, when we pull the pushrods out they are full of oil, the front pushrods dont seem to have as much. We tried mating the pushrod to the rocker and blowing air and there seems to be no restriction, we even tried different rockers, everything is new. Some concerns that we have are the o-rings on the msd pro billet distributor adjustable coller, we tried removing them but no help, copied a non adjustable coller measurment distributer but same result. We are also curious about the front cam plugs, maybe we forgot to reinstall them when cleaning, but would we develop any pressure at all? also the big finger points to the rear cam bearing, didn't notice anything unusual but we are totally open to sugesstions.. and the numbers dont seem to follow a grooved rear cam journal..
[ October 01, 2002: Message edited by: colaus ] [ October 01, 2002: Message edited by: colaus ]</p> 
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10-01-2002, 02:59 AM
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NO oil on both sides or just one, what kind of rockers are u using, is this the early 396 block, any oil restrictors?Are you checking oil press at the top rear of block or on the drivers side at filter?What kind of lifters and cam , manufacture
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10-01-2002, 03:32 AM
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Its a 454, both sides are affected, we have two oil pressure guages one by the oil filter and one off of the front main, its a summit cam and lifters. The rockers are comp cams roller tip, but we tried some of my new harland sharp.. oh and no restrictors were used..
[ October 01, 2002: Message edited by: colaus ] [ October 01, 2002: Message edited by: colaus ]</p>
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10-01-2002, 05:27 AM
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Was the motor freshly overhauled? Bearings could be installed incorrectly. Oil pressure flows from the filter and then to the main & cam bearings so if a cam bearing is installed incorrectly that would reduce the oil flow to the lifters and consiquently to the push rods and lifters. Check the front plugs to be sure, you could loose enough pressure here.
I believe oil will flows through the front cam bearing and then to the lifter galley.
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10-01-2002, 03:09 PM
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Just a thought how long are you running this when you are checking for oil up top, it does take a while to see the oil at idle and the oil is cold, with the aftermarket rockers.Pour some oil on the rockers and let it run till you see oil when you rev it.
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10-01-2002, 04:09 PM
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My guess is that the cam bearings were not properly installed.
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10-01-2002, 09:25 PM
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I heard that only two companies are making lifters now, one being AC and the other stanoline, supposely the stanoline lifter piddle valve is made with cruddy tolerances? our engine shop guru told us to keep the motor rapped up and eventually the oil will come, he doesn't buy the cam bearing idea due to the fact that we fill the pushrods with oil, nor the front cam plugs missing, he thinks that we would have no oil pressure at all... the ac lifter have a number laser scribed on them, and everyone else gets the crap.. a new company is tooling up to produce quality budget flat tappet lifters... anybody know anymore tid bits?? Also FYI oil has to go around the distributor notch to reach the cam gallies, so carefully measuring the relationship of hole to o-rings (adjustable coller dist) is critical..
[ October 01, 2002: Message edited by: colaus ]</p>
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10-02-2002, 01:38 AM
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Installed a empty distributer housing and spun the pump, after 5 minutes all rockers got oil...
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10-02-2002, 04:44 AM
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Was this the first time to motor had been run?
It's very important to prime the system first before starting, this eliminates dry surfaces upon start up.
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