Question about 1988 Hyundai Excel 4 Door Hatchback

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Harmonic balancer is breaking off or vibrateing

We bought a 1988 hyundai excel and a few days afterwards the harmonic balancer broke the front of the crank shaft off. we replaced all rod and main bearings,and the harmonic balancer and timing gear on the crank shaft. after 500 miles it is vibrating again and it is not loose. i have asked every machanic and machinist i know and they have come up with nothing. what am i overlooking?

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  • vrtigo1227 Jun 17, 2008

    the balancer thatwas replaced was O.E.M. the gear for the timing belt also. I did notice that the old one was brass and the new gear was not brass. it did fit the crank shaft tight. it looks like it mayhave bent the nose of the second replacement crank shaft already. shop refuses to warranty the crank because they say something else is causing it, but they cannot say what.

  • vrtigo1227 Jun 17, 2008

    all data just says to replace the timing gear that has been done.

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I broke a socket in the harmoni balancer now i need help removing it

Posted on Apr 30, 2013

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Is this an aluminum block?? If so I hate to tell you this but it has probably been overheated and has expanded out of its original machined clearances. This maybe the reson that the previous owner decided they did'nt want the vehicle anymore. One thing you can do is take it to a machine shop and have the clearances spec'd to see if they still are within tolerances.

Hope this helps You.

Posted on Jul 17, 2008

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Your problem may also because of the timing belt so check that whether it is in good condition . i think replacing the timimg gear will help you

Posted on Jun 17, 2008

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Hi Vertigo!

The crankshaft was replaced, I take it, and now, with all parts replaced, you are encountering the same problem?

Well then, the problem must lie within something you did NOT replace. I would suspect that the main bearing seats in the engine block are misaligned, putting undue stress on the crank and balancer. It could also be a severe internal engine imbalance (one or more piston(s) and/or connecting rod(s) being significantly lighter or heavier than the rest. Not to mention ill-fitted main bearing caps or attachment bolts.

In all practicality, these issues are more expensive to address than the questionable value of the results. The earlier Hyundais were not known or their engineering excellence! They were just the cheapest transportation available at that time (a la Yugo!), and you got what you paid for....

I would try and locate a complete replacement engine, and I have seen Excels with complete drivetrain transplants from other makes, in particular Mazda and Nissan... and they made some fast runners with the larger than 1.5 liter displacement engines in the lightweight Excel chassis..

Sorry for your problems, hope this is illuminating and helpful, and please let us know if you have further questions ot comments!

Good luck and thanks!
WildBill

Posted on Jun 17, 2008

  • Bill Bellomy
    Bill Bellomy Jun 19, 2008

    I have NEVER seen a timing belt BREAK A CRANKSHAFT!!! ARE YOU SERIOUS??? And the #1 response???? This is weird!

    -WB

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It is a hyundai... was it an OEm balancer fitted or a cheapo spare. Try an original and see how you go

Posted on Jun 17, 2008

  • Graeme Ross
    Graeme Ross Jun 17, 2008

    It is worth replacing the balancer again in case it to is failing. Check out the list of recalls and problems for this model also. There may be a reference to your problem. I am reading as well.

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