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Valve adjustment??


Rasp933

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Bottom part is screwed into head and stays there. Top part with the ball ....
 
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....screws down into the bottom part to set the valve lash. The nut in the middle is tightened down to hold the setting.
 
 
What can happen is the valve seats wear down, earlier ones were bronze and needed the lead in gas to lubricate them. Non leaded gas wears them out faster. The valve then burrows up into the head and the pivot post bottoms out and runs out of adjustment. Eventually you will need to replace the seats with the later hardened ones, but you can get more adjustment by grinding the adjustment nut thinner. Might get you through the winter when you don't want the car off the road.
 
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Comparing both nuts. Bottom one is uncut.

This will allow the top part to set deeper into the bottom. You may even have to grind a couple of threads off the bottom.

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Also write this down on a big piece of paper, E I I E E I I E. As you adjust one valve cross it out. E is for exhaust and I is for intake and as mentioned earlier go on YouTube and see Datsun L series valve adjust, it makes more sense when you see it vs reading it. Good luck.

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to remove rocker arms where "unlocking" jam nut doesn't work, get/make strong rod (I ground down end of allen wrench) that fits into rocker oil hole and lever towards cam. rocker heel will rise off pivot and you swing to side: free rocker. No need to touch adjustment. Remove rocker arm spring retainer and you can use socket and big bar to remove pivot socket.

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On 5/21/2018 at 8:42 AM, d.p said:

Yes, that's the tool.

 

Those jam nuts can be very tight and using the Snap-On crow's foot may be the best way to get them loose in the car (on an engine stand is a lot easier).

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