when the M was first produced the oil filter consisted of a fine wire mesh screen. These were soon replaced with a paper element that could do a better job of filtering in a smaller size. The M filter base was made smaller when the paper filter became the standard and the smaller tractors continued to use the same diameter filter base but the canister was made shorter.
The serial number break when the filter size was changed was engine number 59393\59394 so your 42 M may have come with the larger base. In that case it may have been converted to the aftermarket filter to upgrade to a better filter than the tractor came with from the factory.
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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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