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Farmall SMTA Valve chatter issue

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Brady Miller
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PostPosted: Tue Jan 15, 2013 7:48 pm    Post subject: Farmall SMTA Valve chatter issue Reply to specific post Reply with quote

I've got a smta. When you load it hard or rev it up, the valves chatter a lot. Just finished headvgasket replace, still smokes some when revving hard, and chatters. Installed a 450 head, with new valves guides etc. Reused old valve train. Timing light says it's on time on number one. I know I need to retorque and re gap valves, I understand there will be some chatter but mineis too much. Please advise
 
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rustred
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PostPosted: Tue Jan 15, 2013 8:23 pm    Post subject: Re: Farmall SMTA Valve chatter issue Reply to specific post Reply with quote

ya but have you set the valve lash to .017?now?
also i am sure that a 450 head was longer valve stems than the super m head. so if you have not checked these things out you have a problem .
 
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D Slater
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PostPosted: Tue Jan 15, 2013 8:23 pm    Post subject: Re: Farmall SMTA Valve chatter issue Reply to specific post Reply with quote

Guessing the time is advanced to much. Need to check the static time and distribtor advance. Or you have a piston to valve clearance problem.
 
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Janicholson
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PostPosted: Wed Jan 16, 2013 6:36 am    Post subject: Re: Farmall SMTA Valve chatter issue Reply to specific post Reply with quote

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
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PostPosted: Wed Jan 16, 2013 7:02 am    Post subject: Re: Farmall SMTA Valve chatter issue Reply to specific post Reply with quote

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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D beatty
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PostPosted: Wed Jan 16, 2013 7:14 am    Post subject: Re: Farmall SMTA Valve chatter issue Reply to specific post Reply with quote

The M,SuperM and 450 take the same intake and exhaust valves .
 
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rustred
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PostPosted: Wed Jan 16, 2013 7:51 am    Post subject: Re: Farmall SMTA Valve chatter issue Reply to specific post Reply with quote

here is some #'s from my w-400 head when i had it rebuilt.
valves: 362436 r1
length: 6.070
exhuast:36.i6
intake :15.01
i am sure that these are longer than the standard m valves. anybody have valves they can measure.
 
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rustred
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PostPosted: Wed Jan 16, 2013 8:12 am    Post subject: Re: Farmall SMTA Valve chatter issue Reply to specific post Reply with quote

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
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PostPosted: Wed Jan 16, 2013 8:20 am    Post subject: Re: Farmall SMTA Valve chatter issue Reply to specific post Reply with quote

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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Brady Miller
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PostPosted: Wed Jan 16, 2013 8:36 am    Post subject: Re: Farmall SMTA Valve chatter issue Reply to specific post Reply with quote

Here is a picture of the Distributor. I basically need to find top dead center #1. Spark plug cap at 3 o'clock, rotor in Distributor at 2 o'clock?

 
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rustred
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PostPosted: Wed Jan 16, 2013 8:39 am    Post subject: Re: Farmall SMTA Valve chatter issue Reply to specific post Reply with quote

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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rustred
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PostPosted: Wed Jan 16, 2013 8:47 am    Post subject: Re: Farmall SMTA Valve chatter issue Reply to specific post Reply with quote

ok, now thats what i thought. that terminal with the wires needs to be at 3 oclock, which requires pulling the dist out and getting it in proper order.same with the plug wires there not correct either. now next step.
 
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Brady Miller
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PostPosted: Wed Jan 16, 2013 8:55 am    Post subject: Re: Farmall SMTA Valve chatter issue Reply to specific post Reply with quote

So, that terminal is the cap that the plug wires plug into? or is it the single wire coming from the coil?
 
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rustred
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PostPosted: Wed Jan 16, 2013 8:57 am    Post subject: Re: Farmall SMTA Valve chatter issue Reply to specific post Reply with quote

now get #1 cyl. on compression at tdc.
take out the 2 dist bolts with clamps and pull out dist.
have cap off, turn rotor to 2 oclock as viewed from behind. hold dist so wire terminal is at 3 oclock and reinstall dist. leave bolts slightly loose.
recheck your timing marks on front pully make sure correct.
turn on ignition and rotate dist clockwise a bit, then turn counter clockwise till you just hear the spark snap. that is where you tighten the dist and you are timed.thats it. good luck
 
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rustred
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PostPosted: Wed Jan 16, 2013 9:00 am    Post subject: Re: Farmall SMTA Valve chatter issue Reply to specific post Reply with quote

the terminal that is jammed into the coil and preventing rotation. it has to be at 3 oclock not 12 oclock as pictured.
 
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