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23hp cylinder knocking. Rebuild or is it repairable?
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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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23hp cylinder knocking. Rebuild or is it repairable?
Had an outboard on my boat for a few months and decided to put my 23hp mud buddy LT back on for duck season coming up. Started her up no problem but immediately knocking hard on one cylinder. (Video attached). Took the plug out to find it black and the piston grinding on the cylinder wall. Not sure of the damages done but definitely not trying to put a bunch of money into this old thing. What can be done????
Mods= timing advance key, hi rev kit (spring shims and valve rods) , thin head gaskets, carb kit, gov. lockout).
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_________________ 1438 Jon / 23hp MBLT
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Thu Sep 17, 2020 10:00 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: 23hp cylinder knocking. Rebuild or is it repairable?
Shortblock is only bout a 900 range i think. Rebuild youself goin .020 over for 4/500
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Thu Sep 17, 2020 10:08 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: 23hp cylinder knocking. Rebuild or is it repairable?
I found a bare block online for $85 and pistons for $30 each. Can everything else come from my engine or is there more I'm gonna need besides obvious gaskets and stuff.
_________________ 1438 Jon / 23hp MBLT
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Tue Sep 29, 2020 8:29 am |
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Russ
MMT 1000 Club
Joined: Mon Dec 31, 2012 11:07 pm Posts: 4820 Location: West Monroe, LA
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Re: 23hp cylinder knocking. Rebuild or is it repairable?
It depends on if the rod was damaged, and if it messed up the crankshaft or not, as well as the head. You won't know that until you take the old engine apart and start inspecting everything. You will need rings for the pistons, and a hone for the cylinders on your "new" block. Maybe new pins for the pistons/rod link.
#CFFITR #mudmotor>physics
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Tue Sep 29, 2020 8:35 am |
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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: 23hp cylinder knocking. Rebuild or is it repairable?
Alrighty. When I tear into it I'll see and probably post it to get more advice. Thanks.
_________________ 1438 Jon / 23hp MBLT
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Wed Sep 30, 2020 12:22 pm |
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