Question about 1993 Mazda 929

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Mazda 929 1993 model timing belt changed but it won't start

I have a Mazda 929 and the timing belt snaps when it was running. take ti to my mechanic and have change it but it won't start at all. we have set the timing withe the markers on the rollers. we haven't install the power steering, fan belt, radiator, fan and have tried to start the engine but it won't work.it cranking well but it won't start. have check the fuel form the tank. it's firing well and the spark plug.all OK. It's a very rare model around in my country and can be pretty tough to look for the right people for the job even parts i must say.it's our first car and i love to keep it though. please help.

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Run a compression check on the engine, you may find several to all cylinders at zero to very low readings due to the engine being an interference engine--which means that if the timing belt breaks while running, valves and pistons will lose their reference to each other and cause several to many collisions between those multiple components. The compression check will confirm this. The proper fix in this case is to remove the cylinder head(s)(if a V6) and inspect the valves and pistons for damage, replacing either bent valves, or punched through pistons. In any case, this will likely cost a bundle of cash to fix. If not reassembled correctly, this problem could reoccur when you try to start it again. Best to have a lot of confidence in the person doing the repairs! You might look at replacing the engine outright with a new or professionally rebuilt engine from another country. The proper time to replace the timing belt is before it breaks! Hope this helps!

Posted on May 14, 2010

  • atticprintin May 14, 2010

    Thank you so much for the immediate response. I've check that as well and the reading is low.but there is something confuse me here. I have the full specs manual for this car.under valves section this is what it says "ADJUSTMENTS
    VALVE CLEARANCE ADJUSTMENT
    1) No valve clearance adjustment is required, as Hydraulic
    Lash Adjusters (HLA) are used. If noise exists when engine is started,
    operate engine at 2000-3000 RPM for 10 minutes."
    Do you think the HLA would take care of that problem?

  • drallim May 14, 2010

    No, valve running clearance is not the problem--note that it says to run the engine for 10 minutes. Your engine won't start. What are the compression readings for each cylinder? If 10 to 15 PSI below specs, that should allow the engine to run. If you are getting maximum readings of 15 to 30 PSI or lower, then look for the damage I described. Good luck!

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