Gears in lower unit

[JOHNLINDA530]

I HAVE A 2005 MERC 4 STRKE 60HP EFI WITH ABOUT 200HRS. IT HAS BEEN SERVICED ANNUALLY & UNTIL NOW HAS NEVER BEEN ANY PROBLEM. THIS WEEK AFTER SITTING ON THE TRAILER SINCE APRIL I PUT IT IN THE WATER, IT STARTED & RAN PERFECTLY. I IDLED OUT OF THE MARINA & GRADUALLY ACCELERATED TO CLEAR SOME OF THE STALE GAS, AFTER ABOUT 100YDS. IT SEEMED THAT I HAD SPUN THE CENTER HUB ON THE PROP AND THE BOAT STOPPED. AFTER GETTING IT ON THE TRAILER AND TAKEN APART I DISCOVERED THAT THE PINION GEAR HAD DISINTEGRATED & THE FORWARD GEAR HAD THE TIPS OF THE TEETH GROUND OFF. EVERY THING ELSE WAS CLEAN AND IN GOOD SHAPE. I ORDERED PARTS FROM **********. WHILE LOOKING AT THE PARTS BLOW UP I NOTICED THAT THERE WAS A SHIM SET LISTED. I WENT BACK AND LOOKED AND I COULD SEE NO SHIMS, ALTHOUGH THE OUTER BEARING RACE APPEARS TO BE PRESSED IN & THEY COULD BE BELOW. I NEED SOME ADVICE FROM A MECHANIC BETTER THAN ME. SHOULD I PULL THE OUTER RACE & IF I DO HOW DO I FIGURE THE RIGHT AMOUNT OF SHIMS? IT APPEARS THAT THE PINION & FORWARD GEAR WERE NOT PROPERLY MESHED IN THE FIRST PLACE.

 

[Texasmark]

Re: Gears in lower unit

Would like to help you but you are way over my head. Maybe this will bump it up and you can get some qualified help.

Mark

 

[Faztbullet]

Re: Gears in lower unit

If it ran 200hrs it was shimmed correctly, if not it would not have lasted 5 hrs. You will need several special tools to repair this as you cannot just install the new parts as tolerances are different and must be reshimmed. Hope you ordered the complete gear set as reverse gear will be damaged/dinged also. After you get parts take it to a dealer and have them set it up and you also likely need new bearing thru out the unit as this metal debris play havoc with roller bearings and races.