A lot depends on what is knocking. If it's a rod or main bearing, really good chance the crank will be out of spec from the failed bearing pounding it.
But, you won't know until you get in there.
If you take the head off, and are not going to pull the cylinder sleeves, be sure to bolt the sleeves down with a couple of bolts and washers. The sleeves just sit in the block with an oring seal at the bottom. If not bolted down, they can ride up, break the seal, leak coolant, trash will get underneath and hold the sleeve up. Whole nuther can of worms to get them reseated!
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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