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Allis Chalmers Discussion Forum
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Re: Lube Failure and Rocker damage

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08-18-2012 02:57:48

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I have 3 "good" sets in my parts pile. All of them show shaft and rocker bushing wear to some degree. The bigger problem is the unavailability of rocker arm bushings - if they"re not tight to the shaft oil just runs out the end rather than lubing the shaft and being forced up the rocker to lube the valve and pushrod.

I figured a precision shaft and new brass (not Oillite) bushings, drilled to feed the upper rocker, would be better than another used part that"s already on the path of failure.

I actually thought of rerouting the oil line to feed the shaft directly but that still would leave the clearance problem, would have to flood the upper and starve the cam/mains to get adequate oilling.

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08-18-2012 18:57:38

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 Re: Lube Failure and Rocker damage in reply to d13series2, 08-18-2012 02:57:48  
i have rebuilt 3-4 different B motors and have seen shinny spots on the shaft and small wear on the rocker arms. Seems like it was only a couple thousandths. Maybe im lucky, but i just cleaned them up and reinstalled. Seemed to oil o.k. Some of it might be the end plates on teh pump itself. Smooth plates with very minimal clearance will increase the flow available to lube. As Dave said, the tube inside the filter is the "restrictor" that allows a small amount to blead off thru the filter. I think the tube has 1 or 2 of a 1/8 inch hole in the top. No tube or big hole will cause low flow / low pressure.

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