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Rocker spindle

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Good morning all.  I've been doing some work on the cylinder heads of my Navigator.  I see that the "inner pillars" that support the rocker spindles have top hat shaped bushes pressed in to place, see photos.

Any ideas on the purpose of these bushes? 

 

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Hi John,

Only a guess - but as that end is only splash lubricated, it was decided to have a replaceable bush there in case anything went wrong - better then scrapping the head. In reality, i've never seen any issues there in any engine i pulled apart.

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I cannot see the need for lubrication here. 

I wonder if "fretting" may have been a problem, the clamping of the spindles isn't that positive.  I have six heads here, all are a reasonable fit on the spindle, so probably not fretting.

Another thought that it was a way of rescuing a manufacturing mistake, the bush is in the parts list, so, again probably not.

 

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