Reved up by mistake during lube cycling

Discussion in '2005+ Mustang GT 4.6L Tech' started by redirelaP, Jul 26, 2020.

  1. Laga

    Laga Member

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    A little OT. When I lived in North Dakota and operated a garbage business. The truck I had was a Ford F600 with a 390 gas engine. Back then, we used straight SAE30 weight oil. At -35°F, a block heater would keep the engine warm enough so that starting and wear was not a problem. We got 150K miles out of that truck. But, to add oil to the engine at that temperature, we had to scoop the oil out of the drum with a trowel and put it in an empty coffee can in front of a kerosene heater to get it fluid enough to pour. Also, you had to play with the PTO at first start. If you simply put the PTO in gear and released the clutch, the SAE10 weight hydraulic oil would be so stiff it would kill the engine. You had to repeatedly apply and release the clutch to get the oil moving.
     
  2. 07 Boss

    07 Boss Senior Member

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    I always verify pump operation before lighting the fire of a newly built motor. Just habit I have developed after spending a summer building a 396 oval port and dropping it into a chevelle that was supposed to be my daily senior year. It didn't run for more than a few seconds but I ended up driving a challenger that year.
     
  3. Midlife Crises

    Midlife Crises Member

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    I’ve always liked to pre lube a new motor. I pumped 4 qts of oil into my 4.6 through the oil pressure switch port on the filter adapter. Watched the oil flow through the cam followers and then turned the engine by hand with no plugs to see the oil pump work. This can be done on an engine stand where it is easy to get to. Put the pressure switch in the hole, covers on the heads and spark plugs where they go and drop the engine in the bay.
     
  4. 1950StangJump$

    1950StangJump$ forum member

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    Does it not achieve the same thing by killing power to the fuel pump and cranking it over?

    Besides, that also gives you a chance to work the air out of the power steering fluid
     
  5. Juice

    Juice forum member

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    If you have the spark plugs in, the compression is putting pressure on the bearings without oil flowing yet.
     
  6. 07 Boss

    07 Boss Senior Member

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    Kinda but we are talking about brand new motors. A car that has been running and then sits for a while does not need it. A new motor does not necessarily need it either. I only do it because of a bad expensive mistake I once made and only to verify pump operation, not to pre-lube anything.

    And air in the PS system should never be an issue. It should bleed itself after a couple turns of the wheel. I've never bench bled a ps pump.
     
    1950StangJump$ likes this.
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