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Farmall & IHC Tractors Discussion Forum
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450 WON'T START/ VALVES??

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Hoss357

03-12-2008 03:59:24




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PULLED THE VALVE COVER THE TWO CYLINDERS W/COMPRESSION EACH HAD ONLY 1 VALVE THAT LOOKED LIKE THEY MOVED HOWEVER THE PUSHRODS DIDN'T LOOK LIKE THEY MOVED????? ?




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r4etired

03-12-2008 06:25:27




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 Re: 450 WON'T START/ VALVES?? in reply to Hoss357, 03-12-2008 03:59:24  
Normally I remove the front pedistal bolts and slide the pedistal out the distance between the bolts, then bolt back using the front frame bolts in the rear pedistal holes,this will give you enough room to remove the front cover.



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Janicholson

03-12-2008 06:02:21




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 Re: 450 WON'T START/ VALVES?? in reply to Hoss357, 03-12-2008 03:59:24  
I'm sure you are on the right track. If you turned it through at least one complete revolution while watching the valves, and only some of them have moved, the issue is cam drive. The gear can have a broken hub, the hub can have a sheared key, or the cam can be broken.
Each of these can happen without having a load on the engine, and the distributor can still turn (apparent good ignition timing). Causes might include a piece of trash in the hydraulic pump jambing it just enough to shear an already worn key, A broken hub thet just hung on till time cought up with it, or a valve that stuck causing the force on a weakened drive to finally fail. If the above lack of motion through several rotations of the engine is correct, pulling the front cover is the next step. Best of luck, JimN

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Hoss357

03-12-2008 06:16:19




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 Re: 450 WON'T START/ VALVES?? in reply to Janicholson, 03-12-2008 06:02:21  
What all is involved with pulling the front cover?
does the front axle need to be removed like the book call for??



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Janicholson

03-12-2008 06:35:46




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 Re: 450 WON'T START/ VALVES?? in reply to Hoss357, 03-12-2008 06:16:19  
r4 answered the question. It does require safe practice and jacking to prevent the front bolster, and components from tipping out of the rails, it is heavy. JimN



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r4etired

03-12-2008 05:33:01




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 Re: 450 WON'T START/ VALVES?? in reply to Hoss357, 03-12-2008 03:59:24  
Check and see if the distributor shaft is turning steady and take off the oil fill cap and listen for any noises while turning the engine over. If your push rods aren't moving it must be the cam.



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r4etired

03-12-2008 05:33:00




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 Re: 450 WON'T START/ VALVES?? in reply to Hoss357, 03-12-2008 03:59:24  
Check and see if the distributor shaft is turning steady and take off the oil fill cap and listen for any noises while turning the engine over. If your push rods aren't moving it must be the cam.



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r4etired

03-12-2008 05:02:39




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 Re: 450 WON'T START/ VALVES?? in reply to Hoss357, 03-12-2008 03:59:24  
It might be the center is broken out of the cam drive gear, This was not uncommon in the 400=450 tractors especially the ones with a fast hitch that did not have system hydraulic power steering.



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Hoss357

03-12-2008 05:16:54




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 Re: 450 WON'T START/ VALVES?? in reply to r4etired, 03-12-2008 05:02:39  
it has p/s and a loader



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