Originally Posted by DavefromNZ
Thanks Impi. The SD 50s are about 3 years old. We were aware of overfilling and so after the last fix had the level at about 1/3 way up the dipstick. However no one could tell me if it should be dipped with or without the stick being screwed in?
We replaced the lower shaft seals also in Aug. They are going to try to fix the upper seals this time with the yacht in the water as the engine can be slid forward about 6 inches. Last time that was enough to drop the SD 50s but I am not sure if they will have enough room to work, do they need to use a puller on the seal?
All this days before a 6 week trip I have been planning all year for!
The dipstick must not be screwed in ... just on-top of the thread. Over filling causes the seals to 'push out' ... if the top seals go it shows by a leakage between the engine / saildrive housing. On the Lagoon 440
one has enough room to move the engine forward for this task. The agent simply used a 'bent screwdriver' to pry the top seal.
I am wondering why you are having the seal problems? One thing you may want to be watching for is how the oil is changed with the boat in the water. If you use too much air pressure it will push the seals out ... something I am pretty cautious of.
When re-filling, make sure to replenish the oil with at least the same capacity you removed if the oil was at the right level. Often, a top up will need an overnight for the oil to 'settle in' ... do not screw the filler cap down but rather leave it 'loose on the top' to allow air to 'flow' without causing a vacuum ...a re-check in the morning is essential and if requiring a 'top up' keep checking until the oil is full.
I have heard from a number of owners that they are using oil, only to find they never got it filled in the first place ... just looked that way as the oil takes a while to subside into the casing.
Frequent changes DEFINITELY are the key to getting longer life out of the SD50's ... and check with the dealer for oil type updates. I was already told to change oil type twice ... not very comforting!
Also - on the SD you are having trouble with ... make sure the prop turns FREELY by hand when out of gear
. I know of a cruiser who got rope
around his prop and bent the casing. Hope this helps.