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Case 446 w/ Onan 16 Hp

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Ray

05-12-2003 10:10:11




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The engine in this Case 446 tractor quite suddenly stopped acting as if it had almost seized. It backfires out the exhaust when I crank it. I've checked the compression and found one cylinder w/ 130 psi and the other only 30 psi. I don't see anything wrong with the piston, valves, or head gasket. Does anyone know if a timing problem could the problem? If so, how do I go about finding out?




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John Saeli

05-12-2003 10:17:58




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 Re: Case 446 w/ Onan 16 Hp in reply to Ray, 05-12-2003 10:10:11  
Ray; Our 446 acted the same way, when I tore it apart I found a broken camshaft.



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if

05-13-2003 10:17:03




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 Re: Re: Case 446 w/ Onan 16 Hp in reply to John Saeli, 05-12-2003 10:17:58  
If the points run off the end of the camshaft, and the camshaft is broken, how can the engine run at all????



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AllanC

05-16-2003 20:58:07




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 Re: Re: Re: Case 446 w/ Onan 16 Hp in reply to if , 05-13-2003 10:17:03  
You may just have a valve keeper fallen off. I'm no Onan expert but I've seen this on other small engines.



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