Warning! New filter system on new Yanmar engines is Bad! - Page 2 - SailNet Community
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post #11 of 51 Old 08-18-2019 Thread Starter
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Re: Warning! New filter system on new Yanmar engines is Bad!

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Originally Posted by Minnewaska View Post
Crazy is right. I'd remove the whole thing and replace it with the Racor, rather than just add a Racor.
Yeah I think you're right. But I am wondering about the wires out of the yanmar filter that give the water warning. If they are not used does it effect the electronics in some way? I doubt it but I will ask before removing it.
Or I could just bypass the yanmar filter.

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Re: Warning! New filter system on new Yanmar engines is Bad!

You can get a water alarm for a Racor as well. I'm not sure, but suspect it would be the same wiring. If not, I doubt the boat stops working, if the alarm is inop. YMMV.
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Re: Warning! New filter system on new Yanmar engines is Bad!

One thing I substantially prefer about the Racor 500, over the Yanmar filter in your pic, is the clear bowl. You can visually see sediment and water.

You probably know this, but the 500 comes with and without a metal cup under the clear plastic bowl. I understand the metal cup is necessary, if mounted in the engine compartment. I'm really not sure if it's to deflect heat or catch a drip. It's nearly impossible to ignite dripping diesel fuel, unless a fire is already raging, in which case, I don't see the cup helping.
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Re: Warning! New filter system on new Yanmar engines is Bad!

Mark,

A question.

Does this troublesome Yanmar filter have a hand pump on its top? I think I see one in the picture. That might be a nice feature to retain if possible.

Is there a way to replace the banjo fitting with something more straight forward? Iíve had good success with a Parker dealer helping me out with odd fittings.
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Re: Warning! New filter system on new Yanmar engines is Bad!

I've got the metal cup underneath the filters and consider them bothersome as they are in the way and don't make removing any water or sediment any easier or less prone to spillage.

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Last edited by Zanshin; 08-18-2019 at 07:21 AM.
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Re: Warning! New filter system on new Yanmar engines is Bad!

Iíve been TOLD, by a surveyor, that the damn metal cups are an ABCY requirement.
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Re: Warning! New filter system on new Yanmar engines is Bad!

I had the dual racors and never found them clogged etc. from bad fuel. I decided to remove one and so have on single pre filter. Maybe I use so little fuel which is clean that I don't get logged and clogged filters. Engine filter is changed each year regardless.

How much fuel do you use before you you need to replace a racor?
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Re: Warning! New filter system on new Yanmar engines is Bad!

Almost unheard of to pump bad fuel in New England. Water maybe, but still uncommon.

I've been in third world countries, where fuel has been hand cranked out of 55 gallon barrels off a flat bed truck. Into an aircraft! Guess how long you sit there on the ramp, running up the engines to insure the fuel isn't contaminated.
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Re: Warning! New filter system on new Yanmar engines is Bad!

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Originally Posted by Minnewaska View Post
Almost unheard of to pump bad fuel in New England. Water maybe, but still uncommon.

I've been in third world countries, where fuel has been hand cranked out of 55 gallon barrels off a flat bed truck. Into an aircraft! Guess how long you sit there on the ramp, running up the engines to insure the fuel isn't contaminated.
I think the fuel I buy at the dock is clean and high quality and super filtering should not be necessary except for breakdown and gunk which may accumulate in the tank. Of course it's not a bad idea... but likely a but of overkill. Offshore is a different story.
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Re: Warning! New filter system on new Yanmar engines is Bad!

The water alarm is triggered when the resistance between the two wires drops. I'm not sure if diesel conducts much or not at all, but any water in the fuel will be contaminated enough to be a good conductor - so the alarm will go off when the resistance goes towards 0Ohm. This makes it easy to test if you can access the plug end of the alarm cables, just turn on the ignition (the engine doesn't have to be running) and short the two cables and listen to see if a buzzer goes off. I didn't test this on my engine because I couldn't get at the plug for the cable and wasn't going to drain the fuel filter again just to check this.
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