Yanmar 3gm30f secondary filter next problem - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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Old 06-18-2013
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Yanmar 3gm30f secondary filter next problem

I finally managed to loosen and unscrew the threaded ring completely. To my big surprise I was unable to get the bowl of. I loosened the screw marked with a red circle on the photo. Still unable to get the bowl of. I could only loosen it to a certain and then stopped because I was afraid to break something. I thightned the ring and screw. Bled the system using the bleeding screw marked green on the photo. The engine started and ran without any problem. I have not be able to change the filter.

Questions

1. What is the screw marked red on the photo for ?

2. Why am I unable to get the bowl of ?
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Old 06-18-2013
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Re: Yanmar 3gm30f secondary filter next problem

I'm not sure what the red screw is for but the othe one is for bleeding the system.
To remove the filtre you need to turn the fluted collar that goes around the top of the filtre's container. Once you have that undone take a wood malet and tap on the side of the container, it should come off.
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Old 06-18-2013
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Re: Yanmar 3gm30f secondary filter next problem

I unscrewed the fluted collar but was unable to remove the container. I did not try to tap the side of the container.

Questions

1. Shouldn´t the container fall of once the fluted collar has been unscrewed ?

2. Is there a risk something will break if I tap the container ?

3. How is the filter fixed in the container ?

Last edited by carlager; 06-18-2013 at 08:53 PM.
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Old 06-19-2013
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Re: Yanmar 3gm30f secondary filter next problem

Not sure which post to use as you have two posts going regarding this filtre.
None the less; The canister is not going to just fall off, it will need some coaxing.
Be aware that it will be full of fuel.
You may also want to put some heat into your engine prior to doing this. It will make starting it later, easier.
The filtre is held in place by the compression of the canister's collar. It is sealed off by a rubber o-ring inside.
The canister is made from cast aluminum and that's why you should use a soft hammer.
There is also an o-ring for the top of the canister that should be replaced.
It is also a good idea to fill the canister with fuel to help facilitate restarting.
Do not over tighten it, it is only aluminum.

Good luck
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Last edited by Dog Ship; 06-19-2013 at 09:18 AM.
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Old 06-19-2013
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Re: Yanmar 3gm30f secondary filter next problem

Follow Dog Ships advice above. Done this each spring on my 3GM30F as he outlines.

Pretty sure the "red" bolt is just part of the supporting bracket. No need to take it off.
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Old 06-20-2013
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Re: Yanmar 3gm30f secondary filter next problem

Thanx a lot for your answers
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Old 06-25-2013
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Re: Yanmar 3gm30f secondary filter next problem

Hopefully you got her off by now. Once the collar is loose, if the bowl is still tight, you could try lightly twisting by hand the bowl to free if. The other screw looks to be another port on the fuel filter. It is never removed, not sure why it is there, maybe has somthing to do with the fabricating of the fuel filter housing, then the hole is blocked off with the screw. Looking at a Yanmar parts book, both of these screws having a washer gasket to provide an air/fuel tight seal. So make sure the gasket is there and screw tight as an air leak could cause running problems.
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