Yanmar fuel/water separator

[Snowandsail]

Hello all I have a 2022 Yanmar 4JH80 engine on a Bali 5.4. Went to replace the fuel/water separator filter yesterday and there is a plastic nut on the bottom that contains a sensor, and the thing won’t come off. It is able to rotate about one inch in either direction when I spin it, but it won’t spin any further. I am scared I will break it if I try harder and then I will not have a working engine. This seems like a very poor design to me, does anyone know the best way to get this cap off?
Thank you.

[GreenWave]

Are you trying to remove the white plastic piece or the whole metal cylinder? The latter should unscrew and your filter is likely inside of that.

[Snowandsail]

The whole metal cylinder is the filter. That is how the replacement part comes. I need to remove the plastic cap on the bottom in order to replace it.

[GreenWave]

Ah right. Mine work same way but I don't have a sensor. I assume you tried pulling it straight out after rotating it?


My engine is a 4jH3e so not much more help I am afraid

[Snowandsail]

I did try that a bit but I would hate to strip the plastic threads in the cap. That part would be very hard to find and replace. I just can’t believe they would make this so difficult and fragile. I feel like there must be another way that I am missing.

[GreenWave]

go here- https://www.manualslib.com/y/yanmar+4jh80.html


Look at age 94. It seems that the item you are trying to remove does indeed spin off as a threaded connection. May just need to put some more into getting it off.

[Snowandsail]

Page 94 of the operation manual is about the oil filter

[GreenWave]

Originally Posted by Snowandsail

Page 94 of the operation manual is about the oil filter

I noticed that the link has 2 or 3 versions of the manual. Mine must be a bit different. Nonetheless, it is in there somewhere.

[Brick1776]

SnowandSail: I’ve been looking for that exact water/fuel separator for a 4jh80. Do you have that part number? (Just the filter not the assembly) or a link to source one?