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Restoration & Repair Tips Board

Valve adjustment on JD A

Author  [Modern View]
dslfarmer

09-04-2012 15:04:23
166.181.3.35



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I'm having troubles adjusting the valves on a 52 A does anyone have any suggestions or help. The two outside valve push rods seem to be as tight as possible but they are not closing properly. Thanks




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John T

09-05-2012 04:41:00
216.249.82.117



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 Re: Valve adjustment on JD A in reply to dslfarmer, 09-04-2012 15:04:23  
When you say...."The two outside valve push rods seem to be as tight as possible but they are not closing properly"

The valve cant close if theres absoulutely no free play/clearance between the pushrod, rocker arm and valve stem. That will cause low compression, valve burn out, backfiring and total failure to run depending on how over tight its adjusted!!!!!!!!!

When the one valve (Intake or Exhaust) is open the other must be closed so on that closed valve the adjustment has to be loose enough so theres like 0.020 clearance between valve stem and rocker arm WHICH ALLOWS THE VALVE TO FULLY CLOSE.

When you say the pushrod is always tight it sounds like theres absolutely no free play lash at all. Get the other valve open then loosen that always tight valve so theres a 0.020 gap between the valve stem and rocker arm

Orrrrrrrr perhaps I dont understand what you say or your question???

John T

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Popinjohn

09-04-2012 17:13:50
24.168.43.43



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 Re: Valve adjustment on JD A in reply to dslfarmer, 09-04-2012 15:04:23  
My preference is to adjust the valve lash on the intake valve when the exhaust valve is fully depressed (open), then rotate the engine so the one I just adjusted is fully depressed, then adjust the other. One cylinder at a time. Most JD's like yours are .020 cold.



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dslfarmer

09-04-2012 20:43:15
166.181.3.13



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 Re: Valve adjustment on JD A in reply to Popinjohn, 09-04-2012 17:13:50  
Thanks Im not sure what I was doing wrong but think I got them right now, I'll recheck using that way.



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