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View Poll Results: Which is the Bleed Screw
The small Phillips Head Screw 4 28.57%
The larger slotted screw 6 42.86%
Both 2 14.29%
Dunno 2 14.29%
Voters: 14. You may not vote on this poll

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Old 20-06-2015, 15:58   #31
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Re: Which is the Bleed Screw - 2GM20 Fuel Filter

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Originally Posted by Roy M View Post
Wotname, thank you for that picture. It clearly describes the use and value of the torque seal, as well as (hopefully) reducing the incidence of an air leak from that one inaccessible spot on my engine. I love CF. By the way, what is the red-painted bolt head below the fuel filter?
Sharp eyes .

It's the bleed screw at the input of the injector pump. The bleed screw of the other fuel filter is also now red. It might help to assist with the bleeding process idea if for some unaccountable reason, I have to talk this though to a mechanically challenged person.

Some would think I'm going overboard or being overly fussy and I might agree with them .
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Old 20-06-2015, 16:26   #32
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Re: Which is the Bleed Screw - 2GM20 Fuel Filter

I went thru my old maint records & found that at the same time I found the length of the bolt & shortned it I also fitted some washers I obtained from hydraulic hose people which are steel & neoprene. I was thinking the whole thing was like hydaulic hammering!I was chasing vibration as the reason. Any way its been over 5 years & still all good. Before this both filters were always covered in a bit of diesel. This fixed both engine filter problems in my boat. There was a history of filter problems before I bought this boat by 2 previous owners.
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Old 11-07-2015, 20:14   #33
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Re: Which is the Bleed Screw - 2GM20 Fuel Filter

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Originally Posted by four winds View Post
10mm wrench fits the smaller "air bleeding bolt" as the manual calls it. It has a slot cut through the threads to help the air escape. Barely has to be loosened as a result. The nylon sealing washer will distort very easily. So don't over tighten. Good part to have in the spares box I think. Especially if you mistakenly remove the bolt entirely and drop it in the bilge like I did. Have no idea where that thing went.

The larger bolt is referred to as a "plug" in the manual diagram. No mention of it in the text that I see.

The sealing surface of the larger bolt is no higher than the bleeding bolt on my filter body.
Saw this at the Yanmar dealer the other day, it is a 3YM something I think.

Answers the question of the "other plug" I guess.
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Old 11-07-2015, 20:52   #34
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Re: Which is the Bleed Screw - 2GM20 Fuel Filter

The 10mm hex/Philips screw at the inlet to the injector pump doesn't get mentioned in the bleeding instructions in my 2GM manuals. That might be the same as the red-painted screw in the the earlier photo.

Most of the time bleeding it it is not required, however I did have an occasion where I was at my wit's end and spied it and thought, "well worth a try", after which the old gal sprang into life.

Cheers, Graeme
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Old 11-07-2015, 21:39   #35
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Re: Which is the Bleed Screw - 2GM20 Fuel Filter

Yes, the 10mm on both the fuel filter and pump - same 10mm size w/phillips.

One thing I've done is add a leash (long wire-tie) to my 10mm wrench. Previously when bleeding the fuel system, my 10mm wrench has fallen into bilge space unknown. I've never found my 10mm wrench though I did find a rusted glob of a former 10mm wrench that must have fallen into the bilge eons ago. Lost forever (or until the next owners finds a blog of rusted wrench like goo). The leash helps me fish out the wrench from wherever it falls.

Don
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