Posted by Hobo,NC on December 11, 2017 at 05:33:35 from (75.136.231.157):
In Reply to: 6,0 chevy gas posted by stonerock on December 10, 2017 at 15:50:57:
Having spent $1000 are more on several different occasions fighting oil pressure/noise issues I came up with a way to eliminate the oil pump (down stream and up stream of the pump) a pump will not pump what it cannot suck.
I install a manual OP gauge and check pressure cranking off the starter disable the ignition are fuel. I am looking for at least 15PSI as soon as I hit the starter are RAT NOW not later.
If I immediately get OP the suction side and pump are OK I probably have a issue with bearings and possible lifters (yes a lifter are lifters can bleed enoufh to effect OP. I then drop the pan and apply a external pressure source and look for a extreme leak either at the crank, cam are from the returns form the intake galley. The intake would have to be removed to get a good look at the lifters.
If I don't get immediate OP off the starter I drop the pan and hook a vacuum gauge to the pickup. I should see immediate vacuum cranking off the starter if not I confirm the pickup is OK if its OK its the pump (a pump can not pump what it can not suck)
Sounds time consuming its cheaper than throwing money at it an ending up with a pile of junk.... You get paid well for diagnostic time but loss your arse on hopes and wishes...
A leaking pickup can overcome a bad seal it it has a healthy pump and every thing is in good condition upstream. You will see a delay in pickup time on the OP I have seen 15 seconds then the pressure pops up good. The problem is the oil becomes aerated from the leak you may have noisy lifters for awhile till it warms up but you have good OP.
With 10PSI only you have your work cut out for ya a suction test is the best way I know to eliminate the pickup and pump. From there the search is on, a rod bearing are crank bearing is two hafts it only takes one haft of a bearing on either to fudge up you OP. Its the norm for folks to say I checked one rod bearing it was OK that means the rest are OK if you go there check them ALL! BTDT got the T-shirt. :evil: It only takes ONE HAFT to throw OP off how lucky are you that by chance just happen to check that one....
I have had mechanics I respect much say OP is made at the cam bearings I agree as long as every thing before them is in tip top shape... Its a long road to come to that occlusion tho...
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