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  #1  
Old 04-11-2013, 06:11 PM
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cmatthew cmatthew is offline
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Default knock under load
at idle runs smooth. forward or reverse, under load theres a knock. full throttle the knock is gone.
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  #2  
Old 04-11-2013, 07:33 PM
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Sam Mac Sam Mac is offline
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Originally Posted by cmatthew View Post
at idle runs smooth. forward or reverse, under load theres a knock. full throttle the knock is gone.
How about a little more info like what engine are we talking about?
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Old 04-11-2013, 09:18 PM
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Originally Posted by Sam Mac View Post
How about a little more info like what engine are we talking about?
He may be talking about the 12hp in his 123? Just as a guess I am going to say the PTO may be chattering a bit if the 3 anti rattle clips are gone.

Found this pic on Google images:
Rattle.jpg
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  #4  
Old 04-12-2013, 11:22 AM
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cmatthew cmatthew is offline
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sorry. yes its my 123. and those rattle clips are gone. I was thinking also of that being the possible culprit. I haven't been able to find any clips for sale yet. I also did a slight rebuild this winter. everything was in spec. new piston, rings, rod. valves lapped. the knock was there before all of this too.
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CC 123
402c Sickle Bar, 48" Mower Deck
QA42A Snow Thrower, 42'' Push Blade
IH Back Blade and Rake
Brinly Seeder/Aerator
Brinly Lawn Rake
Brinly 10" Moldboard,Brinly Cultivator, Brinly Disc
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  #5  
Old 04-12-2013, 11:56 AM
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Originally Posted by cmatthew View Post
sorry. yes its my 123. and those rattle clips are gone. I was thinking also of that being the possible culprit. I haven't been able to find any clips for sale yet. I also did a slight rebuild this winter. everything was in spec. new piston, rings, rod. valves lapped. the knock was there before all of this too.
did the crank get measured/turned down? a new rod on an egg shaped crank will knock like crazy at certain rpms/loads. i had a 147 like that.
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  #6  
Old 04-12-2013, 02:19 PM
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rod was within spec so I left it alone.
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IH Back Blade and Rake
Brinly Seeder/Aerator
Brinly Lawn Rake
Brinly 10" Moldboard,Brinly Cultivator, Brinly Disc
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  #7  
Old 04-12-2013, 04:59 PM
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Post a wanted add for those clips. I bet someone here may have some extras.
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1973: 128, ag tires, 3pt. lift, spring assist, lights, 42" Deck

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2016 XT1 42" deck 18HP
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  #8  
Old 04-23-2013, 12:23 PM
cubfixerupper cubfixerupper is offline
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Talking Regarding knocks
I'm new to cubs but believe my knocking comes from 2 engine mount bolts missing and one other lose causing engine to slap up and down against the frame. Made a terrible noise. Will let you know if it solved the problem once it's up running again. Let me know. Good luck.
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