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Fixing the Yanmar SD50 clutch slipping problem (Clutch Maitenence)



Please watch these videos on Youtube before you start working with the clutch as the films gives you a better visual description for some aprts of our text below.

Film 1: Yanmar SD 50 Clutch Maitenence. https://www.youtube.com/watch?v=M4EwhbRHvvE

Film 2: Yanmar SD40 / SD50 Saildrive Upgrade. https://www.youtube.com/watch?v=ov1c6E3lcAM&t=932s

Folm 3: SAILDRIVE UPGRADE KIT fixes more than one problem! - Episode 48. https://www.youtube.com/watch?v=4TrROns2Eh4&t=309s


A general overwiev of the xxx part of the SD50


1. Removing the clutch oil

Tools: Fingers or a wrench/pliers to open the yellow cap.

1a. Start by removing the cap on the oil supply port and use an oil pump to remove about 0,2 to 0,3 liters of oil. Check the quality of the oil when you are done pumping.


2.Removing the gear casing cover

Tools:13 mm socket or spanner wrench

2a. Untighten the 4 screws on the top of the cluth house

watch out that you dont drop the lock washer on each of the bolts

Lift the cover carefully as there is a o-ring and also there might be a shimm underneath (on S/y Älva there was no shimm). don tlose it and dont bend it.

Be also carefull with the o-ring so you dont loose it or damage it.

You can also just let the casing cover stay in its place after unscrewing the bolts as you will now move to next step and its better if you protect the clutch from getiing dirty.


Releasing the gear shift lever

mark with a marker pen so you know where to re-aligne the sifter

Tools: 13 mm socket wrench

theres is a spring inside so the lever is popping out

open the two bolts, be carefull that you dont drop the lock washers. These two blots are slightly shorter than on the cover so its easy to know which belongs to whic part if you happend to mix them.

Look at the gear shifter inside and be sure that you know which side is to the front and which is to the aft .See Film 3 at time 18:10.

3.Moving the axis

Tools: a hammer and something solid but "soft" to put agains the bolt and nut so they will not get damaged.

3a. Start by measuring how many mm the bellhouse bolts are sticking out from the bellhouse before you start unlocking the nuts. This is important to know when you are tightening the nuts back and need to know if you have managed to pull the axis inside the bellhouse back to its place.

3b. Use xx keys and untighten the 4 nuts (2 on each side of the engine) all the way to the top of the bolt but do not remove them as you will need the bolts to stop the axis moving too far inside the bellhouse.

3c. Use a soft hammer and a piece of wood to tap the bolts into the engine. Do the tapping equally on both sides so it will not get jammed. Baby steps is to be recommended.

3d. When the nuts has been tapped all the way into the bellhouse go to step 4.