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General Minitrail Talk
Tech Area
Verify Oil Pump Flow - Top End Noise
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<blockquote data-quote="69ST" data-source="post: 185944" data-attributes="member: 5"><p>I doubt that you have an oil pump/oil flow problem.</p><p></p><p>That is a lot of side clearance but not what I'd consider noteworthy. It might be a contributing factor with the clacking. The rockers can be displaced laterally from cam and/or valve contact; and it can vary with temperature. It is possible to shim the rockers, using thin washers; you'll have to do some fab work...either drill-out the ID or cutting-down to OD of washer big enough to have the right ID.</p><p></p><p>New rockers, adjuster screws and valves might eliminate the lateral displacement, a.k.a. "walk" but it might take a new cam, too. The contact surfaces all develop a wear pattern, over time. It's also possible that the existing valvetrain parts will break-in again, developing new wear patterns...resulting in less "walk" and the noise going away.</p><p></p><p>As long as the cam journals, inside the head casting, are not worn to the point where the cam is rattling around, I doubt that anything will be damaged. You should look for metallic flecks (the old, dreaded, "stardust") when you change oil. A certain amount of fine sparklies is to be expected with a fresh rebuild. An abnormal amount means something is getting chewed. It's unclear to me, at this time, just how loud the noise actually is.</p></blockquote><p></p>
[QUOTE="69ST, post: 185944, member: 5"] I doubt that you have an oil pump/oil flow problem. That is a lot of side clearance but not what I'd consider noteworthy. It might be a contributing factor with the clacking. The rockers can be displaced laterally from cam and/or valve contact; and it can vary with temperature. It is possible to shim the rockers, using thin washers; you'll have to do some fab work...either drill-out the ID or cutting-down to OD of washer big enough to have the right ID. New rockers, adjuster screws and valves might eliminate the lateral displacement, a.k.a. "walk" but it might take a new cam, too. The contact surfaces all develop a wear pattern, over time. It's also possible that the existing valvetrain parts will break-in again, developing new wear patterns...resulting in less "walk" and the noise going away. As long as the cam journals, inside the head casting, are not worn to the point where the cam is rattling around, I doubt that anything will be damaged. You should look for metallic flecks (the old, dreaded, "stardust") when you change oil. A certain amount of fine sparklies is to be expected with a fresh rebuild. An abnormal amount means something is getting chewed. It's unclear to me, at this time, just how loud the noise actually is. [/QUOTE]
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Verify Oil Pump Flow - Top End Noise
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