My Lagoon 400
has Yanmar SD50
saildrives. The survey
showed gear oil
leakage, which the mechanical surveyor
attributed to the forward seal of the sail drives. My engines are about 7 years old (2010 model boat
built in late 2009), and have about 850 hours.
I have two questions:
1). What is the service
interval for the forward seals
of the SD50
? I didn't see this as a maintenance
item in the operator documentation
. The closest mention was to check for oil leaks
periodically. The boat
yard says the service
interval is 6-7 years, so I should go ahead and service both.
2). For people who have replaced the SD forward seals
, have you also replaced the engine
rear seals at the same time? The yard is recommending this also, since once the engine
and the sail drive are apart for the forward seal replacement, the engine rear seal is a small addition.
Note that only my starboard side has gear
oil from the sail drive leaking, not engine oil. So far, my port side is totally dry.