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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 13-06-2015, 19:02   #16
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Re: Which is the Bleed Screw - 2GM20 Fuel Filter

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Originally Posted by Wotname View Post
Curious.

Did you ever try new washers or even two washers per bolt?

I will store this snippet of info for furture consideration as I always had the faintest screen of diesel on the bottom of the filter. Not really moist or damp but always returns after awhile no matter how well cleaned off.
Thanks for the heads up.
I've found that the banjo bolt at the inlet to the fuel filter tends to vibrate loose over time. Every few months I have to tighten it a smidgen again.
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Old 13-06-2015, 19:12   #17
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Re: Which is the Bleed Screw - 2GM20 Fuel Filter

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I've found that the banjo bolt at the inlet to the fuel filter tends to vibrate loose over time. Every few months I have to tighten it a smidgen again.
Now there's a point!

I use torque seal indicators at work to see if anything has come slightly loose but never thought of that for the boat

New project to do
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Old 13-06-2015, 19:18   #18
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Re: Which is the Bleed Screw - 2GM20 Fuel Filter

No trouble since I shortned them!!! & yes I tried all sorts of combinations of washers & thickness even high pressure hydraulic washers. Just put a bolt in the housing & see how much a gap is left for sealing. I used to think it was vibration but now all is good on both engines.
(even tried Glyptol!!)

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Old 13-06-2015, 20:08   #19
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Re: Which is the Bleed Screw - 2GM20 Fuel Filter

Wow. I never heard of torque seal. I found some on Sky Geek Organic Products F-900 Torque Seal from SkyGeek.com but haven't a clue how to use it effectively. I have been having a persistent air leak in my system, and because the fuel pump/filter/banjos are in such an awkward place, I haven't got to them for inspection, yet. Is the torque seal just used for confirmation of movement, or does it function as a sealant also?
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Old 13-06-2015, 20:20   #20
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Re: Which is the Bleed Screw - 2GM20 Fuel Filter

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Wow. I never heard of torque seal. I found some on Sky Geek Organic Products F-900 Torque Seal from SkyGeek.com but haven't a clue how to use it effectively. I have been having a persistent air leak in my system, and because the fuel pump/filter/banjos are in such an awkward place, I haven't got to them for inspection, yet. Is the torque seal just used for confirmation of movement, or does it function as a sealant also?
Instructions say to not put it on threads or you may never be able to remove the bolt. It is just to be used as an indicator.

I'd think nail polish could be used as well.
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Old 13-06-2015, 20:31   #21
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Re: Which is the Bleed Screw - 2GM20 Fuel Filter

About to order a torque wrench for my new-to-me Yanmar 3GM30's, and wondering what is the highest torque value I will need so I know what to buy??
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Old 13-06-2015, 20:37   #22
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Re: Which is the Bleed Screw - 2GM20 Fuel Filter

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About to order a torque wrench for my new-to-me Yanmar 3GM30's, and wondering what is the highest torque value I will need so I know what to buy??
From memory, the highest torque setting was 70-75 foot pounds, 65 for crank nuts and 70 ish for the head bolts.

If you have to ever take the crank out you'll need to fabricate a 6" deep 36mm socket.
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Old 13-06-2015, 21:25   #23
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Re: Which is the Bleed Screw - 2GM20 Fuel Filter

Mine is also equipped with the slight fuel sheen around the filter. I replaced all the washers so I guess it's time to try a double washer and then the bolt shortening. While I can't say it's been a problem, being curious I usually end up closing the engine bay with a thin film of diesel on my left fingers.
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Old 14-06-2015, 03:16   #24
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Re: Which is the Bleed Screw - 2GM20 Fuel Filter

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Originally Posted by Roy M View Post
Wow. I never heard of torque seal. I found some on Sky Geek Organic Products F-900 Torque Seal from SkyGeek.com but haven't a clue how to use it effectively. I have been having a persistent air leak in my system, and because the fuel pump/filter/banjos are in such an awkward place, I haven't got to them for inspection, yet. Is the torque seal just used for confirmation of movement, or does it function as a sealant also?
Most important thing to know is that it is NOT a sealant.

Really just a convenient thick paint in a tube that dries reasonably fast. It is about the consistency of toothpaste and the tip of the squeese tube is say 1/16" in diameter or maybe a bit smaller.

Applied in a stripe along or across the nut, bolt pipe fitting etc.

Can used as an indicator that the fitting has been torqued or as an indicator that the fitting has been loosened or undone at some stage.

Say complex piping is loosely fitted up and hand tightened until everything is nicely aligned. As the fittings are torqued, each operator applies their colour of torque seal. Next shift comes along and can tell right away what work remains to be done.

At a later inspection, a quick visual will tell is something has come loose or has been tampered with (assuming the one doing the tampering hasn't packed his own torque seal .
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Old 14-06-2015, 08:20   #25
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Re: Which is the Bleed Screw - 2GM20 Fuel Filter

Very cool! Now I know why it was referred to as "anti-sabotage" indicator. Thanks folk.
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Old 14-06-2015, 08:35   #26
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Re: Which is the Bleed Screw - 2GM20 Fuel Filter

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Well the big one is slightly higher than the small one so using the big one is better in principle!

And easier to use with a socket if you are like me and prefer sockets to screwdrivers!
Either of those top-bolts works (on a 3GM30F)equally well and if you're ever a bit clumsy using a socket on the larger/outboard bolt, you can get the body re-drilled/threaded and make it even bigger
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Old 14-06-2015, 16:05   #27
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Re: Which is the Bleed Screw - 2GM20 Fuel Filter

I think I marked mine & found that the tightning to prevent leak indicated the vibration was causing either or both the washers being flattened, the thread in the body changed slightly. Also Yanmar tried a flex line on the input side in later production motors. From memory it is more the problem of the length of the input side. Had the problem for over 10yrs before shorting the bolt & now no leaks at all.

I think the stripping of the bleed screws is caused by trying to fix this problem.
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Old 20-06-2015, 01:56   #28
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Re: Which is the Bleed Screw - 2GM20 Fuel Filter

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I've found that the banjo bolt at the inlet to the fuel filter tends to vibrate loose over time. Every few months I have to tighten it a smidgen again.
OK, just managed to tighten the inlet banjo bolt maybe 20 degrees and the outlet say 10 or 15 degrees. Used "normal" hand force and normal spanner (wrench!).

And then prettied it up some

Let's see how it works out!
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Old 20-06-2015, 03:20   #29
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Re: Which is the Bleed Screw - 2GM20 Fuel Filter

Last price for one was near $300! Be careful with the wrench work!!
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Old 20-06-2015, 08:03   #30
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Re: Which is the Bleed Screw - 2GM20 Fuel Filter

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?
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