Greetings,
Mr. S.
-Put on your safety glasses and gloves if you want to wear gloves.
-Get everything ready and very close to hand. Paper towels, diapers, TRASH PAIL, mirror, wrenches, small pick to take out top gasket, small container to drain filters, small container of clean diesel & small funnel (or oil can as I suggested above) to fill filters.
-Assume a comfortable position.
-Put diaper(s) under filters.
-Drain filters, one at a time, into small container via the white spigot on the bottom of each housing.
-Change diaper when you make a mess.
-Loosen nut on the top in the middle of the housing.
-Change diaper
-Remove filter and make SURE you remove the o-ring/gasket that will be in the top of the housing (use mirror and small pick).
-At the same time you remove the first filter element and gasket take note of the sizes of the gaskets and which one goes where.
-Change diaper.
-Wipe housing (top and bottom) with paper towel to remove any oil or dirt.
-Reassembly is the reverse of the above minus the multiple diaper changes making SURE the upper gasket is properly seated in the square groove in the housing. Some put a light coating of oil on the gaskets before installing but I've done without.
-Snug up the bolts and fill the filters with clean diesel.
-Bleed the rest of the system.
-Wipe everything down with paper towels and check for leaks.
-Close sea cock and try to start engine making sure that IF it starts you immediately open the sea cock.
-Check for leaks again.
Have that beer now while the engine runs for 15 or 20 minutes just to make sure you've purged all the air.