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Clank coming from engine when cold????
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nuccifish06
MMT Pro Member
Joined: Tue Sep 16, 2014 6:36 pm Posts: 108 Location: Sunrise, FL
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Clank coming from engine when cold????
So, took the boat out for a little scouting this weekend. Started her up no problem and she gives a single violent clank and I see a spark from behind the cowling(cover). This has happened multiple times with the prop in or out of the water. Once it warms up it usually never happens again and she runs fine all day, but every once and awhile it does. Anyone have any idea what it is? It sounds really bad but it can't be too serious because it runs good after. Its a 23hp van MBLT with PVT valve stems, spring shims, thin head gaskets, K&N cone filter(no box). She runs 3800-4000 RPM max.
_________________ 1438 Jon / 23hp MBLT
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Mon Nov 13, 2017 11:42 am |
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Will C
MMT Sponsor
Joined: Fri Jan 10, 2014 1:16 pm Posts: 2107 Location: Gladewater TX
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Re: Clank coming from engine when cold????
The only time I saw something like this was on a prodrive that the rear cover was dancing around and making flywheel hit the coils. Pull your shroud and check for coil contact to flywheel. Maybe your rear crank bearing is mad and letting the crank dance
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Mon Nov 13, 2017 12:58 pm |
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Will C
MMT Sponsor
Joined: Fri Jan 10, 2014 1:16 pm Posts: 2107 Location: Gladewater TX
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Re: Clank coming from engine when cold????
Also many longtails will clank on startup from shaft whip. This would not explain the sparks though
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Mon Nov 13, 2017 1:02 pm |
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nuccifish06
MMT Pro Member
Joined: Tue Sep 16, 2014 6:36 pm Posts: 108 Location: Sunrise, FL
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Re: Clank coming from engine when cold????
_________________ 1438 Jon / 23hp MBLT
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Tue Nov 14, 2017 8:24 am |
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