Saildrives: Difference between revisions

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O-Ring parts diagram: [[File:SD20 O-rings Parts Diagram .pdf|thumb|Link]] <br>
O-Ring parts diagram: [[File:SD20 O-rings Parts Diagram .pdf|thumb|Link]] <br>
Service Bulletin - Taper pin: [[File:SD20 Taper Pin Bulletin.pdf|thumb|Link]] <br><br>
Service Bulletin - Taper pin: [[File:SD20 Taper Pin Bulletin.pdf|thumb|Link]] <br><br>
'''Part Numbers'''<br>
'''Saildrive Oil''' <br>
Saildrive seal replacement kit<br>
196313-02591 Saildrive seal, oil prop shaft (Qty 2 per saildrive)<br>
24321-000950 Saildrive rear cover O-ring (Qty 2 per saildrive)<br>
24341-000125 O-Ring, drain plug (Qty 1 per saildrive)<br>
196315-02880    Circlip, Needle 52 (optional to reposition seals)<br><br>
Others<br>
196420-02551 Rubber protector, saildrive leg<br>
196420-02602 Saildrive, rear cover<br>
196311-04060 Needle Bearing (supports propeller shaft, replace it needles fall out or are loose)<br>
196440-02701 Bolt, Bracket (Split zinc bracket, flat head M6X18)<br>
26453-100252 Bolt, M10X25 (Saildrive rear cover bolt)<br>
196420-02530    Drain, M10 (Saildrive oil plug)<br><br>
'''Notes:'''<br>
''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 specifications:'' 80W90W gear oil (API GL-4 or GL-5)<br>
''Oil capacity:'' 700ml<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><br>
 
'''Procedure to change oil in the water:'''<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)
Line 35: Line 17:
# Refill oil to full capacity (bottom of dipstick)<br>
# Refill oil to full capacity (bottom of dipstick)<br>
:(This will replace over 75% of the oil)<br><br>
:(This will replace over 75% of the oil)<br><br>
 
'''Outer diaphragm and secondary inner diaphragm'''<br>
Outer diaphragm and secondary inner diaphragm<br>
''Replacement Guidelines:'' Inspect every 2 year and replace every 5 years<br>
''Replacement Guidelines:'' Inspect every 2 year and replace every 5 years<br>
''Common Practice:'' Monitor condition and test the water penetration sensor<br>
''Common Practice:'' Monitor condition and test the water penetration sensor<br>
''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.
''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.<br><br>


Propeller Shaft Grooves<br>
'''Notes:'''<br>
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.<br>
''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><br>
[[File:Propeller Shaft Seal Grooves.jpg|thumb|Grooves worn into the propeller shafts]]<br>

Latest revision as of 12:54, 29 July 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

Saildrive Oil
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:

  1. Using a pump with a small tube remove as much oil as possible
  2. Refill oil to full capacity (bottom of dipstick)
  3. Run engine 5 minutes
  4. Using a pump with a small tube remove as much oil as possible
  5. 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.

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

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