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Farmall & IHC Tractors Discussion Forum
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OS 400 M, SM, Motor problem

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MagMan

01-11-2006 10:54:11




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Hi Guys I have an older gentelman up the road that has a problem he has come to visit me three times already today. I cant leave the house yet so I will ask you fellas for help. His boy was running the OS 4oo and went in the house and left it ideling when he returned it had quit and would not restart. So I told him to check for spark. Yes He returned I told him to check # 1 plug compresion TDC yes rotor is lined up on #1 plus timing marks lined up on pulley. He thinks but there is 4 different slots for marks. Itold him it must be carbration spray carb cleaner in carb and try to start. He returned and sayed no start but can feel air pushing back against his hand from carb. Ok If the timing gear is still in time I said take valve cover off maybe the key sheared on cam and the gear stayed in time but the cam shaft was not turning. He said the cam was turning but when #1 and #4 pistons are up and valves should be closed that #4 exuast is open. The only thought I have is that the cam key sheared but caught again about 1/3 away around or something any one have any ideas. I hate it when these old gents cant get there machines running. JON

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Don L C

01-11-2006 18:02:02




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 Re: OS 400 M, SM, Motor problem in reply to MagMan, 01-11-2006 10:54:11  
Check.... maybe it ran out of GAS..... .



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El Toro

01-11-2006 14:03:00




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 Re: OS 400 M, SM, Motor problem in reply to MagMan, 01-11-2006 10:54:11  
I wonder if he had No1 piston at TDC on the compression stroke, then both valves should be closed and these valves can be adjusted 1,2,3 &5. No4 piston won't have the valves closed until it is at TDC then these valves can be adjusted 4,6, 7 and 8. I think he should check it one more time. Hal



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El Toro

01-11-2006 13:21:30




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 Re: OS 400 M, SM, Motor problem in reply to MagMan, 01-11-2006 10:54:11  
Since there's no suction at the carburetor when he
held his hand over it, has to be a sheared key or a broken cam.

Everything is in time except for the valves. They won't know for sure until they take it apart.
Hal



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Bob M

01-11-2006 11:30:56




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 Re: OS 400 M, SM, Motor problem in reply to MagMan, 01-11-2006 10:54:11  
Could be the camshaft woodruff key has sheared letting the drive gear "walk" out of time (it's still turning the camshaft but the cam timing is now way out). Or the cam gear hub may have busted then turned partway with the same result.

This kind of failure is not uncommon if the tractor is equipped with cam gear-driven live hydraulics - even for the Super, x00 and x50 series with their "stronger" cam drive gears.

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captaink

01-11-2006 11:07:44




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 Re: OS 400 M, SM, Motor problem in reply to MagMan, 01-11-2006 10:54:11  
Broken camshaft? Any backfiring in carb or muffler?



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MagMan

01-11-2006 14:51:48




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 Re: OS 400 M, SM, Motor problem in reply to captaink, 01-11-2006 11:07:44  
Nope he says it wont fire at all. I kind of figured he needed to get to the camshaft but I did not want to tell him that if it was something simple that I may have missed. He says that it had the cam replaced 20 years ago with a used one becuase the nut came loose. It does have live hyd also. JON



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captaink

01-12-2006 08:00:58




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 Re: OS 400 M, SM, Motor problem in reply to MagMan, 01-11-2006 14:51:48  
Yup, always best to start with the simple stuff first which it sounded like you did a good job of. :>)

Just left us with the more difficult fixes...



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