Oil is fed through third cam bearing (might be second but think third). But, you may have mixed up the rocker arm supports and blocked the passage coming up through the head. Also, I once overhauled a C 291 and had no oil to rockers. Found out the rocker support , although in correct position was covering the feed hole. Just a very small movement to the side and it would uncover it. I wanted the rockers centered over the valve stems so I think I made a little groove in that port in the head or in the rocker support. With 50 hours and a worn out shaft you may have to pull the head because when you take all those rocker side head bolts off that head gasket is not going to like that at all, even if you drain the coolant. Usually the supports are difficult to mix up on the gas engines as some have a guide sleeve but on the diesels, you can mix them all over the place. Have seen it done and rockers really take a beating.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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