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marklar

Zero compression on 2,4,6

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So I'm working on a 2000 626 2.5l that had severe oil sludging. Engine ended up being starved of oil and the exhaust camshaft on the front head (2,4,6) froze up and tore up the bearing journals. Did a compression check and zero on all 3 cylinders. Rear cylinders are fine so I'm getting a used head today and hoping it solves the zero compression issue. I have never done a compression test where the needle didn't even budge. I put oil in the cylinders and still zero. Inspected the head and nothing looks like it would cause zero compression. Any thoughts? Idea's? Timing is correct so I'm kinda stumped......

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