Anonymous asked in Cars & TransportationMaintenance & Repairs · 2 months ago

when over heat an engine, does that usually cause the pistons to get scored? or the cylinders? or rings? which one first, second and third?

can explain why?

talking about not having enough oil in the engine etc.


like which would happen first, second and third?

if the pistons are not scored, does that mean that the cylinder walls are probably okay? what about rings?

5 Answers

  • not
    Lv 7
    2 months ago
    Favorite Answer

    All metal parts expand with heat. Overheating expands them to the point that the piston is too large for the cylinder it goes in. Friction gets excessive; scoring and melting of piston takes place. There is no 1st 2nd or 3rd; it all happens together.

    • 2 months agoReport

      so if the piston is not scored inside a 2 stroke engine, does that mean that the cylinder is not scored as well as the ring?

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  • Anonymous
    2 months ago

    to me this sounds like a mechanics test....or schooling.  If you don't know then LEARN IT.  You deserve to get it wrong. You deserve not to be a mechanic.

    Sorry; that is the way it goes.

    I always have enough oil in my engine.

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  • Anonymous
    2 months ago

    Often, head wharps first, and blown head gasket if Al head.

    Main bearings melt.

    The rings can then over expand,and scuff  cylinder walls, causing seizing or  oil plumping.

    Pistons can melt, yes.

    Much is due to loss of coolant or loss of cooling due to stopped fan, stuck thermo, clogged radiator;  but loss of oil can cause last  3.

    An overly lean mixture can cause high heads temps, too. 

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  • 2 months ago

    Not enough oil in the motor doesn't cause over heating the way no coolant causes over heating. Lack of doing 3,000 mile oil changes and keeping the oil level topped up will cause the piston rings to seize in the piston grooves which causes oil to burn more.

    The crankshaft and connecting rod bearings get worn and seize up

    Source(s): Mitsubishi Master Tech
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  • Anonymous
    2 months ago

    Mechanics do not WORRY about that stuff.  They REPLACE or REBUILD the engine and move on so they can get PAID.

    If it is a leaf blower, THROW IT AWAY.

    • noname2 months agoReport

      "pistons". NST as multi cylinder leaf blower--at least, not stock.

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