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ON A MERCRUISER 120 I HAVE WATER IN THE LOWER END, HOW DO I CHANGE THE OIL?

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  • sheil561 Sep 30, 2009

    THE PROBLEM IS THERE ARE NO DRAIN HOLES, THE MOTOR IS A MERCREUISER INBOARD, THE OUT DRIVE GETS OIL FROM A TANK INSIDE THE BOAT. I'M THINKING THE LOWER END IS A SEALED UNIT, NO PLUG, BUT THE UPPER IS THE PROBLEM, HAS WATER IN THE OIL. I GOT SOME OF IT SUCKED OUT, BUT THERE IS STILL SOME IN THE GEARS. PAT

  • sheil561 Sep 30, 2009

    HALBEC: I HAVE OTHER OUTBOARDS AND KNOW WHAT THE PLUGS ARE AND HAVE CHANGED OIL IN THEM REGULARLY. THERE ARE NO PLUGS IN THE HOUSING FOR THE PROPELLAR, OR ANY HIGHER. TO CHECK FOR SURE I HAVE OTHER PEOPLE CHECK FOR PLUGS, THERE ARE NONE. I HAVE HAD THE PROP HOUSING AND LOVER END OFF TO REPLACE AN IMPELLAR, AND THE OIL LEAKED OUT FROM THE UPPER PART OF THE OUTDRIVE, THAT IS FULL OF GEARS. I DID NOT SEE ANY OILING SYSTEM FOR THE PROP HOUSING, THUS THOUGHT IT WAS A SEALED UNIT. I CAN ASSURE YOU THAT IF THERE ARE DRAIN PLUGS THEY ARE NOT IN THE FAMILIAR PLACES AS ON MY OTHER MERCURY'S.

    PAT

  • sheil561 Sep 30, 2009

    HALBEC: 1984 MERCRUISER 120

  • sheil561 Sep 30, 2009

    HALBEC: ITS A 1984 THOMPSON 24' WEEKENDER

  • sheil561 Sep 30, 2009

    HALHBEC: I THINK THERE WAS WATER IN THE BOTTLE I USED TO TOP OFF THE OIL BOTTLE IN THE BOAT. IT WAS SITTING IN THE BOAT, AND THE CAP WAS LOOSE. PAT

  • sheil561 Sep 30, 2009

    THANKS MUCH...

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  • 770 Answers

  1. Buy a little hand pump that fits the bottle of lube to fill the drive.
  2. Place a clean oil drain pan under the drive to catch the old lube as it drains out of the bottom of the drive.
  3. Use a large screwdriver and remove the lower drain plug.
  4. Remove the top oil vent plug.
  5. Let the unit completely drain.
  6. If your drive has an internal drive lube monitor bottle in the boat, remove the bottle from its bracket and pour out the old lube. Look in the bottom of the bottle. If you see residue in the bottom of the bottle it should be removed and rinsed out with carb cleaner or Power Tune. Make sure the bottle is clean and dry.
  7. If the old lube looks and smells bad it could be an indication of a problem.
  8. Inspect the gear lube for evidence of metal particles or water intrustion.
  9. If the lube looks bad and you suspect a problem, FIX the problem before placing the drive back into service.
  10. If the lube was simply old and smelly it is a good idea to flush the drive one time with new clean lube.
  11. To flush the drive fill the drive from the BOTTOM hole with enough lube to fill the drive and then let it drain out fully. Do NOT reuse the flushing lube.
  12. Use a sharp pointy pick and make sure to remove the old drain plug gaskets from the drain and vent holes. Never reuse an old drain plug gasket. Old gaskets get brittle and hard as rock. Look closely in the hole and use the pick to make sure all of the old gaskets have been removed. Buy new drain plug gaskets and place them over the cleaned-up plugs.
  13. Fill the drive from the bottom-up until the lube flows out of the top/side vent hole.
  14. Install the top vent plug with the new gasket and tighten.
  15. If your drive has an internal drive lube monitor bottle, continue to pump lube until there is approximately one inch of lube in the monitor bottle. If you don't, the upper unit will not be lubricated properly.
  16. Remove the lube fill pump from the bottom hole and quickly install the bottom plug with its new gasket.
  17. Wipe up any residual oil.
  18. If your drive has an internal drive lube monitor bottle, add lube to the bottle up to the "full" line. Be aware that the drive might have an air bubble and that the system might "burp" after being run. This could result in a drop of the oil level in the bottle. Just top off the bottle with clean lube and keep an eye on it

Posted on Sep 30, 2009

  • 2 more comments 
  • Hal Hallman Sep 30, 2009

    Your problem stated lower end, I made an assumption that you meant lower unit and thus posted the solution for that proceedure. If it is crankcase oil that you wish to change, naturally, the proceedure is different. Most will pump the oil out of the crankcase, via the tube that your dipstick goes into. There are pumps available for this proceedure at your local marine supply/dealer. The reason for pumping rather than draining is obvious, you don't want to fill the bottom of your engine compartment with oil...duh. There is another solution that will be of help, for future changings...I highly recommend this. After you get the oil pumped, install a plug with a valve and a tube that you can route thru the drain hole in the hull, (the one U put the plug in when you launch your boat). This plug/valve will replace the one currently in your oil pan. Then when you get ready for your next change, simply route the tube thru the hole in the hull, put a catch pan under it, open the valve and your oil will drain.

  • Hal Hallman Sep 30, 2009

    I had outlined proceedure with the bottle, before replacing the lube in the bottle the system should be drained. The lower unit should not be sealed. There should be drain plugs that simply look like flat screws. If you believe it is sealed, how do you know you have water in the gears...I assume due to the condition of the lube in the bottle? If there is indeed water in the gears, It would have had to come from the lake, indidcating a faulty seal, probably with one of the plugs. Inspect for any screws...they will be flat head, straight screwdriver, about the size of a dime.

  • Hal Hallman Sep 30, 2009

    What is the year of your boat...the make...the engine size and make.

  • Hal Hallman Sep 30, 2009

    Thanks for the info...I have found a free pdf manual download for a 120 sterndrive. It is older than yours but should apply. I scanned the manual and pics and found the plugs...unusual, the vent plug is in the upper unit, and if proper levels are maintained in the upper unit, it lubricates the lower gear housing because of the mannar they are interconnected. I have provided a link, below for the manual download. S/B helpful for this situation, as well as other things that may crop up. Sorry it took so long, hhope this applies and is helpful to you...GOOD LUCK!



    http://www.4shared.com/get/122707788/55b...

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