I recently purchased a boat with the Volvo Penta SX drive. It recently developed a grumbling sound from the drive that only occured around 2500rpm, and was accentuated in a full turn to starboard. After doing some research I determined it must be a bellows issue with damage to the u joints and gimbal bearing. I removed the drive only to find the u joints appeared fine. The gimbal bearing appears fine from the front, and it turns flawlessly. However, the splines of the drive shaft are rusty between the bearing and the engine. There appears to be no water in the bellows, and not a single rust spot on the u joints or the shaft up to the bearing.
Could water have entered in from the back? I know that alot of water sits in the bilge, and simply forgetting to flip the switch for auto-bilge could have filled it with water. The previous owner had two additional gas tanks on the rear decks totaling 36 gallons. There is also a four-stroke 20hp outboard kicker hanging off the back. When I bought the boat it sat noticably low in the rear. The extra fuel has now been removed.
My plan is to remove the gimbal bearing. I still need to find the correct tool for this. I also understand that I need a tool to install the new gimbal bearing and seal. I found these on another thread through Boatfix.com. Correct tools?
1 SIE189835 DRIVER HEAD SIERRA, INC.: $9.78 $9.78
1 SIE189821 DRIVER HEAD SIERRA, INC.: $24.90 $24.90
1 18-9816 Mandrel SIERRA, INC.: $23.02 $23.02
I have already ordered the alignment tool needed to put the drive back on. I plan to replace the gimbal bearing and u joint bellows. This is a follow up thread from a previous one that I posted. I feel as though I have encountered a new problem, and a different thread was in order. Thank you to all who have helped me thus far. I would love to get this issue taken care of on my own, not only for financial reasons, but also peace of mind while im bobbing around in the middle of the pacific in a 19ft boat!