Take a guess? Engine problem

Discussion in 'Mazdaspeed 6 General Discussion' started by Jimme T, Feb 24, 2021.

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  1. Jimme T

    Jimme T Greenie Member

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    Anyone want to take a guess on what’s wrong? I’ll dig in to it soon and post what I find.

    so here’s the story. I bought the car knowing the engine was locked up. I assumed he ran it out of oil or over heated it and just ran it until it wouldn’t go any longer. After talking to the previous owner this is what he told me. Said he was driving down the road and it started acting funny. Said he looked at the AP and the KR was jumping up and down and it kept getting higher and higher. He said it started making noise so he shut it off and called for a tow truck. Said he told the tow truck driver not to start it but the guy did anyway. He said it died while putting it on the rollback and never started again.
    Just to be sure I tried to turn the engine over with a breaker bar and it wouldn’t move. So I pulled the belt to be sure it wasn’t a locked up water pump or ac compressor etc. but still no go. My first thought was it jumped time and piston was hitting a valve but I would think it would still turn one way or the other. I can’t turn it either direction.

    figured I’d see who wanted to take a stab at the diagnosis and I’ll post the problem when I find it. Winter time boredom I guess. I’m going to try to pull the valve cover off this weekend and pull the plugs. Run a bore scope in to it guts and see if I can see anything. Sooooo........give me your best guess.
     
  2. Mikey27

    Mikey27 MSM Motorsports Silver Member

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    Likely a bent rod. That's the way they go most times. If you're lucky the rod only bends a bit and the piston smacks the crank lightly, if you're unlucky the piston comes down and gets shattered by the crank, ejecting parts in all directions.

    Sounds like it was just at the edge, and it's bent enough that the piston is jammed into the crank.

    There's not much else that would lock it up tight other than complete oil starvation (you'd see an oil light eventually, doesn't sound like po did), or a flywheel/clutch catastrophic failure(doesn't seem likely).

    Sent from my SM-N975W using Tapatalk
     
    Last edited: Feb 25, 2021
    Mikey27, via a mobile device, Feb 25, 2021
    #2
  3. L337TurboZ

    L337TurboZ Master Technician Silver Member

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    If the motor is locked up just buy a used engine. You'll have it back on the road quickly and then whenever you get bored you can tear apart the old one to see what the failure was. Plus if the head or valves werent damaged and nothing went through the block you will have a decent core to build or a good head to port.
     
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  4. jsilva

    jsilva Silver Member

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    I vote for bent/broken rod. Post some photos once you get it apart :)
     
  5. Sho

    Sho Silver Member

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    My vote is spun bearings and it got hot enough that they seized to the crank
     
    Sho, via a mobile device, Mar 9, 2021
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