Saildrives: Difference between revisions
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'''Notes:'''<br> | '''Notes:'''<br> | ||
''Blown seals:'' The SD20 is | ''Blown seals:'' The SD20 is susceptible to blowing the seals if the oil is filled too high. Many have added a vent line to the top of the filler cap. Without the vent, only fill the saildrive oil to the bottom of the dipstick<br> | ||
''Sheared tapper pin repair:'' [https://www.strikhedonia.com/anchoring-with-no-starboard-engine-in-a-crowded-anchorage/ External Link]<br> | |||
''Oil specifications:'' 80W90W gear oil (API GL-4 or GL-5)<br> | |||
''Oil capacity:'' 700ml<br> | |||
''Oil change interval:'' Every 250 hours of operation or annually (whichever comes first)<br> | ''Oil change interval:'' Every 250 hours of operation or annually (whichever comes first)<br> | ||
'' | ''Procedure to change oil in the water:''<br> | ||
# Using a pump with a small tube remove as much oil as possible<br> | # Using a pump with a small tube remove as much oil as possible<br> | ||
# Refill oil to full capacity (bottom of dipstick) | # Refill oil to full capacity (bottom of dipstick) | ||
Latest revision as of 11:11, 9 May 2026
Manufacturer: Yanmar
Description: Saildrive Unit
Model: SD20
Manual: File:SD20 Operations Manual 2009.pdf
Parts catalog: File:SD20 Part Catalog.pdf
O-Ring parts diagram: File:SD20 O-rings Parts Diagram .pdf
Service Bulletin - Taper pin: File:SD20 Taper Pin Bulletin.pdf
Notes:
Blown seals: The SD20 is susceptible to blowing the seals if the oil is filled too high. Many have added a vent line to the top of the filler cap. Without the vent, only fill the saildrive oil to the bottom of the dipstick
Sheared tapper pin repair: External Link
Oil specifications: 80W90W gear oil (API GL-4 or GL-5)
Oil capacity: 700ml
Oil change interval: Every 250 hours of operation or annually (whichever comes first)
Procedure to change oil in the water:
- Using a pump with a small tube remove as much oil as possible
- Refill oil to full capacity (bottom of dipstick)
- Run engine 5 minutes
- Using a pump with a small tube remove as much oil as possible
- Refill oil to full capacity (bottom of dipstick)
- (This will replace over 75% of the oil)
Outer diaphragm and secondary inner diaphragm
Replacement Guidelines: Inspect every 2 year and replace every 5 years
Common Practice: Monitor condition and test the water penetration sensor
Recommendations: Pacwest in San Diego does not recommend changing the diaphragms unless there is visible damage or water has penetrated the outer diaphragm. These diaphragm almost never fail. I have read this from other sources who make the same recommendation.
Propeller Shaft Grooves
It is an issue that they Gori propellers installed on a SD20 saildrive will form grooves over time which will result in sea water penetration. Periodic repositioning of the seals using shims allow longer life from the propeller shafts.
