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I have a theory that at the bottom of the tapping I can see the back of a cam shaft bearing shell. Now I assume it's either been fitted incorrectly or turned in the block. Blowing down the hole does not produce any air from the tapping on the front of the engine. With the engine running a tiny drop of oil forms at the base of the hole.
Quote from: Gensetsteve on June 10, 2015, 05:35:10 PM I have a theory that at the bottom of the tapping I can see the back of a cam shaft bearing shell. Now I assume it's either been fitted incorrectly or turned in the block. Blowing down the hole does not produce any air from the tapping on the front of the engine. With the engine running a tiny drop of oil forms at the base of the hole.Have you at this point established oil flow through the oil filter and oil cooler(if fitted), and up to the point where the external oil pipework connects to the crankcase oil gallery?I assume your referring to the camshaft bearing at the timing gear end. This is a cast iron bearing and is held in place by a hidden dowel pin, and it is possible that it has rotated due to the dowel pin been omitted when it was last rebuilt.