X740 2012 has puff of black smoke at starup
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Thread: X740 2012 has puff of black smoke at starup

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    X740 2012 has puff of black smoke at starup

    I have an X740 2012, bought used in 2017, approx 300 hours that has puff of black smoke at startup. I have used Opti-Lube XPD fuel treatment. Do I have anything I need to be concerned about?
    Thanks,
    Paul

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    Many of these Yanmar diesels blow a puff of black or blue smoke at startup. That isn't unusual by any means. If you are concerned, make a video clip of it starting and post on the web so people can take a look and opine on whether your's is unusual in any way.
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    TJR345's Avatar
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    It's a diesel,its normal.
    Tom

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    Quote Originally Posted by TJR345 View Post
    It's a diesel,its normal.
    Exactly. That Yanmar with 300 hours is just starting to get broken in.
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    Mine does the same thing; albeit not every time.


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    Ditto.

    Will do the same thing when engaging the deck PTO. BTW do at idle.
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