The reason you need to put the rotators back is that they extend the live of the valves and valve seats. There are 2 types of rotators , positive and non positive. You clean all the ones that look good (ONE PIECE) and replace the ones that come apart or are broken. To check them you need to do it when the engine is running. Before you start the engine you put a chalk mark on them. When you the engine is running, they will rotate/advance a bit at each valve movement. This action will keeps the seat clean. If you find that some are bad after the engine is reassembed, they can be replaced without taking the head off. A special valve tool and air into the cylinder is all you need to do that. Guido.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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