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breakin after ring replacement 120-130

posted by  Danny on  Fri Jun 28 11:44 CST 2013
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last visit: Mon Oct 6 22:01 CST 2014
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I finally got a manifold sorted out. Should have the gaskets later today.
This engine was smoking - oil consumption. Some scuffing on pistons, but surprisingly not much wear, no broken rings. Honed cylinders and replaced rings. That's it.

Any recommendations on oil weight and breakin?

thanks








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    breakin after ring replacement 120-130

    posted by  james_a_sousa on  Fri Jun 28 20:23 CST 2013
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    last visit: Thu Oct 23 18:51 CST 2014
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    Modern engines have special hone patterns and tolerances that decrease the need for break ins.

    The best explanation that I have read goes something like this -

    Engine speed should be varied every several minutes - acceleration causes extra fuel to wash cylinder walls down, while deceleration sucks oil and vapors up to lubricate cylinder walls. Repeats of this process wears the rings and walls to make a good seal.

    Taking it easy for several hundred miles is good advice as well.

    In Europe, in the '60s, new cars had stickers in their rear windows that read 'En roadage' that explained why the car's owner wasn't driving it like they stole it!








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    breakin after ring replacement 120-130

    posted by  Peetz on  Fri Jun 28 20:14 CST 2013
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    last visit: Thu Oct 9 10:18 CST 2014
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    When you prepared the used pistons, did you clean out the oil drain back holes in the bottom of the oil ring grooves?
    Break-in is easy. Start and fast idle for 10 minutes or so, check all the levels and that the radiator is full, and no oil and coolant mixing. Then drive normally for a couple of hundred miles, gradually becoming more aggressive with the throttle. After four or five hundred you can do as you want. Change the oil then.
    I use 10W-30 for break-in but with modern oils and a new camshaft that can be a problem. Any diesel rated oil of 15W-40 will work fine for break-in and the long haul.






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