Question about 2002 Toyota RAV4

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TOYOTA RAV 4 - 2002

What are the possible causes of the conrod (connecting rod) breaking off the engine ? The mileage is 180 000kms.

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  • kylecc Jun 11, 2008

    Many thanks

    After reading your suggestions I would say that the "metal fatigue" best matches what we have been told. What signs would have been visible to the driver that the controd had broken off? Would there have been an instant breakdown.? Could the driver continue driving without any knowledge that the controd had broken off.?





  • kylecc Jun 11, 2008

    Many thanks again..Okay the Rav was driving on a highway when the driver noticed sparks & smoke from the rear of the car. He pulled to the side, switched off and then noticed smoke coming from under the hood area. Immediately a passing truck stopped to assist.The driver of the truck opened the hood and flames in the engine area were visible. They were extinguished with equipment from the truck. The Rav was towed away and has since been assessed by our Insurance's assessor. The result of his assessment was that the fire was caused by the breaking off of the conrod (through wear & tear) which caused a hole in the side of the engine, resulting in oil coming into contact with the hot exhaust pipe which caught alight. We are however disputing his findings (which have been termed as "internal engine damage", which of course is not covered by our policy). A new engine is required at our cost. We do not believe that catastrophic engine damage would go unnoticed by the driver until sparks & smoke were visible.

  • kylecc Jun 11, 2008

    We believe that something else (either a leak in the fuel line or engine oil leaking onto the exhaust manifold) caused the fire resulting in the heat expanding the metal in the engine area resulting in the conrod coming away from the engine.

    Many thanks for your comments.



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Hi

A hydro-lock in the affected cylinder.

An excess amount of fluid (oil, coolant, water) makes its way into the affected cylinder via cylinder head or head gasket failure for instance, or even by driving through a large body of water.

Unfortunately, fluids cannot be compressed, and hence once the piston rises on its compression stroke, it locks out against the fluid at some point before top dead center, and the conrod either bends or breaks, because the crankshaft will attempt to carry on turning, and the piston will still try to reach top dead center.

Very best regards

Geordie

Posted on Jun 11, 2008

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  • Steve Adams Jun 11, 2008

    Nope, you would be a cylinder down and you would feel the resulting misfire.



    Geordie

  • Steve Adams Jun 11, 2008

    ....and of course you would hear the ungodly noise as the rod broke!

  • Steve Adams Jun 11, 2008

    Hi



    It all would have been over in a few seconds, but he would known something was wrong a soon as it had happened, it wouldn't have taken smoke, flames, and a thrown rod.



    Geordie

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The most common I have found in any engine with this problem occouring are engine been driven too hard constantly, metal fatigue in the conrod and engine run dry on oil.

Hope this helps

Cheers

Posted on Jun 11, 2008

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