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main bearing clearance

Discussion in 'The Garage' started by bigbadchev84, Apr 14, 2005.

  1. bigbadchev84

    bigbadchev84 1/2 ton status

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    is .oo3in too much clearance for main bearings? im trying to find out where all my oil pressure is going
     
  2. diesel4me

    diesel4me 1 ton status Premium Member

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    a little "loose"

    Specs vary from one motor to another,but most chevy's should have between .001-.0035 thousandths clearance--so 3 thousandths is on the "loose" side,but not excessively so...probably 90% of all chevy's with 100,000 miles have at least that much clearance,and not many have oil pressure problems or knocks...Cam bearings can bleed off oil pressure when they get worn,so can loose rod bearings,or a worn oil pump...

    Does your motor sound like a woodpecker when started after sitting overnight??--if so,its a good bet the bearings are loose,and the oil pressure has to build before they quiet down...I've had quite a few motors that did that for a long time with no failures,never did anything about it,other than not "race" the engine when first starting it.. :crazy:
     
  3. BigBurban350

    BigBurban350 1/2 ton status

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    Check your rod bearings and the rod side clearance.

    Buy a higher pressure oil pump.
     

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