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Farmall & IHC Tractors Discussion Forum
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Re: Farmall SMTA Valve chatter issue

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Author  [Modern View]

01-16-2013 06:36:30

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Valves dont clatter unless loose or over reved (3000rpm would do that, but unlikely to be your issue) What you are likely to be hearing is spark knock. I believe your timing is either too advanced (possibly wrong timing mark, or other measurement issue, or the advance is not working.
Another issue is fuel. If a 450 head and other compression enhancing factors like bigger bore, or popup (domed) pistons were used it might need 92R+M/2 Premium fuel. If you find fuel to be the issue, retarding the spark with a different cam plate in the centrifugal advance might be a way to avoid knock and use regular. Jim

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Brady Miller

01-16-2013 07:02:28

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 Re: Farmall SMTA Valve chatter issue in reply to Janicholson, 01-16-2013 06:36:30  

So basically, get it warmed up, i want to retorque the head to insure nothing has backed off, reset the valve train assembly, reset the gap in the valve train to .017, then look at the timing and possibly retard. There does not seem to be much adjustment in the movement of the ditributor, so do I need to remove the geared pin in the distributor that has the cap on it and retard from there or what?

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01-16-2013 08:12:22

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 Re: Farmall SMTA Valve chatter issue in reply to Brady Miller, 01-16-2013 07:02:28  
the wire terminal on dist. is to be positioned at 3 oclock position from factory.and #1spark plug wire is at 2 oclock position. this gives all kind of retard and advance travel when you loosen the two dist hold down bolts and turn accordingly.

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Brady Miller

01-16-2013 08:20:28

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 Re: Farmall SMTA Valve chatter issue in reply to rustred, 01-16-2013 08:12:22  
So are you talking about turning the cap to retard? or Finding top dead center of number 1, then remove that rotor cap in distributor to 2 o"clock while the spark plug cap on distributor is at 3 o clock right?

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01-16-2013 08:39:59

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 Re: Farmall SMTA Valve chatter issue in reply to Brady Miller, 01-16-2013 08:20:28  
no, i am saying that #1 spark plug goes to 2 oclock position on dist cap... thats a factory position. the little screw for the points on the distributer goes to the 3 oclock position... from factory. i am saying this cause i dont know what how your dist. is positioned and you say you have no travel. or just post a pic. of dist on tractor. you have to have dist. in proper position to get proper travel. once this is found out will go to next step.

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