Yanmar 3YM20 belt change - SailNet Community

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Old 09-28-2013
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Having problems changing the water pump and alternator belts. Mainly just getting the alternator belt off. What bolts do I have to loosen?? Here is a pic of where I am now. The lower adjustment bolt is loose. What am i missing?? I plan on getting a crescent wrench and trying to loosen the bolt on top of the alternator is that what I need to do??? Not used to working on boat diesels lol. Cars seem much more logical.

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Old 09-28-2013
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Re: Yanmar 3YM20 belt change

loosen both the top and bottom bolts and it should move like an older style car alternator. heres the manual if you don't have one.
http://yanmar.com/product/marineplea...V2_21JAN09.pdf
http://tehstar.ru/assets/files/manuals/3YM30.pdf
Figure 31 in the parts manual shows there are two bolts on the top and one on the bottom but sometimes you also have to loosen the bolt that mounts the slotted adjustment bracket to allow the bolt to slide in the slot
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Last edited by overbored; 09-28-2013 at 03:00 AM.
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