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  1. #1
    Join Date
    Feb 2014
    Location
    Clayton NC
    Posts
    184

    Default Engine Ticking Noise

    I have a ticking noise coming from my engine on a 2000 Launch DD - there are no noticeable issues and the boat runs great with no issues. The noise started last fall after I tightened the front belt. It is a mild ticking noise which matches the speed of the engine (higher rpms the faster the sound repeats). I thought it was a bad alternator bearing as the alternator shaft was a little loose, so I had the alternator rebuilt, but the noise is still there. I have tried placing a stethoscope on the parts around the area, but i cannot pinpoint where it is coming from. Anyone have a suggestion on how to locate the problem?

  2. #2
    Join Date
    Dec 2012
    Location
    Clark, CO.
    Posts
    587

    Default

    Have you tried loosening the belt to see if the ticking goes away. It might tell you if the ticking is indeed coming from that area. The next thing i would think about is the lifters.
    Function before fashion!

  3. #3
    Join Date
    Jul 2011
    Location
    fort worth , tx
    Posts
    1,171

    Default

    take the belts off and start it up .. where did it go ?
    LIFE IS TOO SHORT NOT TO BE LIVELY

  4. #4
    Join Date
    Apr 2015
    Posts
    121

    Default

    How deep is the ticking noise? It could possibly be as simple as and engine oil flush and good quality oil (im thinking sticking hydraulic lifter) It is a common problem on most American engines. Ive had it on 2 Mercruisers (GM Blocks) a Vortec and an Iron Duke, and 1 PCM ford.
    If it is a lifter the fix is to get engine hot, drain the oil, fill with flushing oil, do the same. Replace filter and oil with good quality filter and oil....dont try to save money on cheap oil, it aint worth it imho.

    Or replace the lifters, $4 each and a days work depending on the engine.

  5. #5
    Join Date
    May 2008
    Location
    Mt Juliet, TN
    Posts
    245

    Default

    Could also be an exhaust leak.
    1987 Supra Saltare
    PCM 454

  6. #6
    Join Date
    Feb 2014
    Location
    Clayton NC
    Posts
    184

    Default

    I did take the belt off (should have mentioned this in the first post) and it did go away. If I loosen the belt it is not as loud.

    UK and H - I may do the flush as it cannot hurt and I need an oil change any way.

    leetudor - could you explain what to look for on this - I am not sure how an exhaust leak could create this.

    I am also going to replace the belt just to make sure it is not damaged.

    Thanks for all the help. Please keep the suggestions coming - I will update the post after this weekend after I have time to work on it.

  7. #7

    Default

    It doesn't sound like your issue is exhaust if the sound goes away when you take the belt off. However, to answer that question, a small exhaust leak can very much sound like a ticking on these engines. It's a fairly high-pitched tick, not like a clack or a knock... if you know what I mean. It's not click and clack the tappet brothers, you know? It's pretty easy to find though, when it is exhaust. You can sometimes feel the air coming out if you get your hand close. Or at least you can pretty easily hear where it's coming from if you get your ears close enough.

    Anyway, it sounds like you've narrowed it down to something weird with the belt. I guess replacing the belt is a cheap way to troubleshoot. So you said there's no play in the alternator pulley, what else does that belt go around? Is the surface nice and smooth?

  8. #8
    Join Date
    Oct 2008
    Location
    Northern Colorado
    Posts
    1,593

    Default

    I had an exhaust leak that was a ticking noise like Squaminboards describes. Mine wouldn't go away taking off the belt, but don't discount the exhaust leak when hearing this sound (for others that may read this thread).
    Had to replace a gasket and all was good.
    2008 24 SSV, Gravity Games Edition.

  9. #9
    Join Date
    Jul 2011
    Location
    fort worth , tx
    Posts
    1,171

    Default

    what type of raw water pick up does this boat have ? crank or belt driven ?
    LIFE IS TOO SHORT NOT TO BE LIVELY

  10. #10
    Join Date
    May 2008
    Location
    Mt Juliet, TN
    Posts
    245

    Default

    Driven by the crank.
    1987 Supra Saltare
    PCM 454

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