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PWG, that stud is threaded into the oil filter head [basically a cast cap on top of the oil filter canister].. That oil filter head is accessed from the top down through the crankcase cover & down under the crankshaft & rods.. That is a difficult job if you haven’t ever done one before as you have to work way down under the connecting rods.. Just getting the oil lines loose can be a challenge.. Small hands & short wrenches are a big help.. I usually pull the rod caps & push the pistons forward [mark the rods & caps before disassembly].. The insides of the oil filter canister must also be pulled out from below [there are 2 holes in the side of the oil filter pipe sticking down inside the canister for using a hooked tool to pull it out [I have had some luck using an old 5 gal pail handle bent to fit the holes then using a heavy pipe to swat downward on the bent pail handle to pull that pipe out].. Once the pipe is out there are bolts above the top washer that hold the filter head on.. The other bad news is: once you have it apart there is a good chance the top of the filter canister is bent [caved] in as that usually happens when the filter lower nut is over tightened.. Getting that filter canister out can be a trying experience [I have actually jacked the tractor up with a pipe inside that canister & not had it budge].. They will come out but just not easily.. If you decide to do that job yourself you really should get a service manual before starting the job.. One last thing,, you will probably also need a new oil filter head as once those threads strip out they are usually toast.. JDClooney@aol.com
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