What all do I need to do to remove the oil injection on my 91 200 Merc? Do I need to remove the oil pump shaft from the powerhead or can I just plug the hole? I had an oil hose bust a couple of weeks ago but I never had any warning alarms. I believe I would rather mix the oil myself to be on the safe side. I checked compression and all cylinders were 120 lbs. Any help would be appreciated.