ok i have another thread going for a different issue on my 89 bayliner with a 2.3 OMC combo but i wanted to get some clarity on how to fill the outdrive. I check the oil level in the drive way and its just to the bottom of the dipstick so since i just bought the boat i might as well change the oil for peace of mind. I bought 2 quarts of Sierra Premium gear oil that says its for use on outdrives and says Hypoid 90 certified. I also bought a oil pump to pump it in.
the issue is i have seen numerous comments that say you need to pump from the bottom plug to ensure no air gaps until it reaches the middle drain plug then start pumping from the middle until it reaches the top. But i have also seen some comments that say the only right way to do it on an OMC is to fill only from the middle, however everytime there was not a reason given for this method. Can someone explain why you should only pump from the middle drain plug and not bottom first? Or is this just wrong infomration being passed around? Thanks
the issue is i have seen numerous comments that say you need to pump from the bottom plug to ensure no air gaps until it reaches the middle drain plug then start pumping from the middle until it reaches the top. But i have also seen some comments that say the only right way to do it on an OMC is to fill only from the middle, however everytime there was not a reason given for this method. Can someone explain why you should only pump from the middle drain plug and not bottom first? Or is this just wrong infomration being passed around? Thanks