I had my timing chain tensioners and guides replaced on my 2003 recently. Prior to having this done I drove my navigator to the shop due to the chain rattle in the timing chain cover. It was running perfect other than the rattle. The mechanic removed the cover and replaced the tensioners and rails without removing the chain. It was said the chain looked good. He put the cover back on ONLY and topped off the oil and started it up to make sure that the timing didn't slip and there's major valve train noise when the truck starts. The oil pressure light goes off at start but it sounds as if oil is not getting to the top of the motor. It was not doing this prior to the parts being replaced. Can you please help with any suggestions as to what it might be. Could it be due to everything not being put together. I don't understand how this could happen. Thanks
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