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Engine Breakin

Discussion in 'Technical Chat' started by GTiVR6r, Oct 2, 2007.

  1. GTiVR6r

    GTiVR6r [OP] Big Cat Chew Toy

    Joined:
    Sep 25, 2007
    Member:
    #2805
    Messages:
    212
    Carpentersville, IL
    Vehicle:
    07 Tacoma Access Cab 2.7L Impulse Red
    This is from my friend who just got a Ford Edge and is on another forum.
    The following in from a guy on there who is a Ford Mechanic.
    Does this sound resonable for all engines or just Fords?

    "Vary the speed for 1,000-1,500 miles (Don't set the speed control at 70
    and drive 400+ miles when new) to generate a wide wear pattern on gears.
    This will help eliminate gear whine. Don't change the oil for 3,000 miles
    or so and don't go wide open throttle for 1,000 miles. You want rings to
    seat and bearing surfaces to wear in easily. Don't put a full synthetic oil
    in a new vehicle unless you live in a sub-zero envirinment. It is too slick
    and can promote glazing cylinder walls.

    The purpose of "Breaking In" an engine is to permit the wear parts to
    "Seat" correctly. In the engines in our vehicles, the piston compression
    rings will seat fairly quickly - say within 1,000 miles or so. The oil
    rings may take a few more thousand miles to seat properly. Let's round
    it off at 3,000 miles for full engine break in.

    Oil ring scrapers are barrel-faced and initially have a very small
    contact area on the cylinder wall. Within the break in period, we want
    to prevent the formation of a "Pressure Ridge" and for the rings to seat
    properly. It takes a fair amount of friction for the rings to seat
    against the cylinder wall.

    In a perfect world, we would like to have a small load on the engine,
    operate it between 2,000 and 3,500 RPM and leave a margin of safety if
    the cylinder hone, bottom end clearances, or overall engine control
    deviates slightly from optimum specifications. (Another reason not to go
    wide open throttle until you have completed your break in.)

    I our "Next to perfect" world, the best action is to leave the "Factory
    Fill" oil in the engine until the first scheduled oil change at 3,000 to
    5,000 miles (or 6 months if you are not driving much). After that you
    should put Motorcraft 5W20 oil in the engine. It is a partial synthetic
    oil and is preferred by Ford engineering.

    The problem with changing out the factory fill oil too quickly, is that
    the synthetic oils (including Motorcraft 5W20) are very slippery. If it
    is introduced into the engine before the ring seating is complete, it
    may cause the formation of a pressure ridge and glaze the cylinder
    walls. This can lead to long term oil consumption problems and the only
    way to correct is to disassemble the engine and re-hone the cylinders,
    and start over.

    It's not really a big problem or concern unless you start consuming more
    than a quart of oil each 1,000 miles. But a proper "Break In" should
    extend oil consumption to a quart or less each 3,000 to 5,000 miles. "
     
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