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Subject: You screen, we all screen?

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Brad    Posted 07-26-2020 at 11:43:10 [URL] [DELETE]        [Reply] [Email]  
  • You screen, we all screen?
  • I was over on YT perusing articles concerning leaking sediment bowl and saw some 2017 comments Bruce (75 tips) posted. Nice thing about having an old antiquie tractor, advice/information remains a constant.


    8N Ford tractor's fuel sediment bowl began leaking a couple of days ago, so I hit-up repair forums and began exploring options. Took everything apart cleaned, and lo and behold! ... can actually see inside of bowl lol ... sadly it remains leaking.

    Bowl didn't seem to have any nicks nor cuts or anything, and I couldn't find any other rough surfaces, & thick cork gasket appears in good shape.

    One absence: screen of any sort associated with sediment bowl.

    Screen/gaskets seem to be affordable enough, however, some forum posts cautions concerning "offshore products" being "almost right", gaskets too thin, screens not fitting, etc ...also cautions voiced concerning gasket sealer causing sediment bowl leaks?

    What do you folks think about smearing some red RTV silicone on top of cork gasket, where it mates up? Could using RTV sealer potentially cause a leak? idk how ... How important is having screen?

    Ford OEM gasket online looks like it was made of rubber, but unhappily comes sans screen. Seems like one could purchase screening and cut out their own? idk where best purchase, avoiding "almost right"? lol ...

    K.LaRue-VA    Posted 07-29-2020 at 14:35:25 [URL] [DELETE]        [Reply] [No Email]  
  • Re: You screen, we all screen?
  • I've never used anything on mine other than the replacement screen and cork gasket sold by just8ns.com. The screen fits right and the cork gasket works. A replacement valve came with a black (rubber?) coated gasket that looked better, but leaked. I replaced with original type cork gasket and it has not leaked since. Most of the time I can remove and dump the sediment bowl, no problem. Once in a while a bit of cork will pull out with the glass. Watch for that, when it happens, it will leak unless the old cork is thoroughly cleaned out and replaced with a new one. If gasket glue is needed, there is a problem. Look for any particle of old gasket material that may have been missed.

    Brad    Posted 07-29-2020 at 16:19:57 [URL] [DELETE]        [Reply] [Email]  
  • Re: You screen, we all screen?
  • Thanks Kevin, that sounds like some well-reasoned sage advice. I have made a repair which I'll be checking out later today, once everything has cured up.

    I used Vaseline on the glass as a mold release, and on bottom of cork where it mates with glass.

    On top of the cork where it mates up and seals against metal surface, I used red RTV gasket sealer, to affix cork where it won't leak.

    Since cork seemed in perfect condition, I reasoned that leak had to be between cork and metal surface it mates onto. RTV silicone gasket sealer/maker was intended to fill any imperfections and adhere such as to prevent further leaking.

    I thoroughly cleaned the metal surface in preparation for receiving RTV, insuring proper adhesion.

    I then tightened up bail holding glass in place against cork (pushing cork up onto the metal surface), but I didn't tighten it fully, because I wanted to allow some room for the Silicon to make a cushion between cork and metal (leaving room for further tightening).

    When I get home from work, sufficient time will have passed for RTV to have cured and I should be able to slightly tighten up the bail further and see if there are any leaks.

    Vaseline as mod release ought insure glass comes away cleanly from cork gasket, without damage to cork.

    Anyway you look at it, I'm going to have to get a replacement seal & screen, since my 8N did not come from previous owner with screening in place. Thanks for link to replacement screen :-)

    When I began cleaning tractor in preparation for paint, I must have lost some of the rust and dirt and disturbed things what was holding everything together lol ;-p

    K.LaRue-VA    Posted 07-29-2020 at 19:44:04 [URL] [DELETE]        [Reply] [No Email]  
  • Re: You screen, we all screen?
  • Another thought occurred. Make sure it isn't leaking where the valve threads into the tank. A leak above will drip down and can look like a leaky fuel bowl. I had a fuel valve wiggle one time while I was messing with it. That clued me in that I might be trying fix the wrong place. Cork gaskets conform to fit and should seal just fine without any goo. I watched a friend take a pair of pliers to that thumb screw for the sediment bowl. Those should be no tighter than snugged with finger and thumb. Crank down hard and the cork gets deformed and probably cracked. A similar problem happens with stamped steel valve covers and oil pans. Over tightening deforms the steel and the gaskets fail where logic says they should be clamped tightest. If the fuel bowl won't seal without gasket glue, I suspect it may be another cheap aftermarket valve body or glass bowl that just wasn't made right.

    Brad    Posted 07-29-2020 at 22:30:53 [URL] [DELETE]        [Reply] [Email]  
  • Re: You screen, we all screen?
  • I have sort of a daily ritual... After I get off work, I will start 8N tractor up (after going through my pre-start-up checklist, which includes checking oil) ... Run 8N through its Paces, checking PTO, 3-point lift, etc ... Of course, honking it's Ooga horn & checking lights... It is a satisfaction to me, being able to go through this routine, because it took so much effort getting 8N tractor to this point, from one purchased non-running ... Ooga! lol :-)

    Today I was doing a side job after work, and didn't get home as early as normal, so before it got dark, I went out and checked the fuel bowl and valve body ... I snugged bail up finger tight, and glass fuel bowl was safely secured ... Holding my breath, and concerned, I opened valve 2 turns, and lo and behold, no leaks! Yea! :-)

    When I was 100% satisfied that there was no leaks, I went ahead and started through my daily 8N ritual ... Ooga! :-)

    Previously had a leak dripping from threads (as you've suggested checking out, Kevin), and used my flare nut wrench set, tightening until it just quit leaking... I kept an eye on it, later it started leaking and I had to tighten it just a bit more, to stop leaking.

    I know from that experience, once you fix something, then sit back and wait to see if the fix is reliable and stays fixed, Otherwise, if it ain't broke, don't fix it lol :-p

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