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Tractor Talk Discussion Forum

154 LO BOY ENGINE KNOCK

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mack

08-06-2004 20:05:05




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rebuilt engine, rebored, new bearings turned shaft. engine has what appears to be a rod knock. rechecked all clearences (twice)all ok. when you short out #1 plug knock goes away. i switched #3 rod assy. with #1, knock goes away when you short it out. machine shop did all machine work. i have worked on engines all my life but i can't figure this one. any help will be appreciated.




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Walter

08-07-2004 03:28:13




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 Re: 154 LO BOY ENGINE KNOCK in reply to mack, 08-06-2004 20:05:05  
Hi Mack, I would strongly suspect a bad piston skirt slap, you did not say if you installed new pistons/rings, another possible cause of this slap could be the wrist pin on that piston is not functioning as it should, this will also give you some grief. The reason it goes away when you short out the cyl is there is no pressure on the piston and will travel up and down through the bore without having side pressure to cause the slap. Just my 2 cents worth, hope this will help you track down your problem, Good luck.
Walter

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Gene Davis (Ga.)

08-06-2004 20:17:04




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 Re: 154 LO BOY ENGINE KNOCK in reply to mack, 08-06-2004 20:05:05  
Had a Kohler once that hadan unlocatable knock, found that the overbored piston assembly was striking against the head gasket. LGD



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