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  1. #1
    Bronze Member
    Join Date
    Oct 2009
    Posts
    80
    Location
    Northern Vermont
    Tractor
    Branson 4720 with loader and backhoe

    Default My worried mind.....

    Just replaced the glow plugs in my Branson 4720 tractor. That cured the hard starting problem I was having. Started right up strong at 12 degrees with a dead cold engine. Thanks again Ken of Valenti's Tractor Valenti's Vintage Vehicles L.L.C dba Valenti's Tractor

    Now for the worry. Two of the plugs had slight black smudge deposits, but the number 1 and 2 cylinder plugs had white rings around them where they were inside the head. If all the plugs were the same I wouldn't be as concerned, but 2 plugs with black deposits versus 2 plugs with white deposits have me worried. I attached a picture of 1 of each of the old glow plugs I replaced to show the difference.

    Do any of my fellow TBNers have an opinion what caused this, and if so, is there anything I can do to fix it before it becomes a larger problem?
    -s1030005-jpg-s1030004-jpg
    Last edited by Vtnewbie; 12-29-2012 at 09:21 PM.

  2. #2
    Bronze Member
    Join Date
    Oct 2009
    Posts
    80
    Location
    Northern Vermont
    Tractor
    Branson 4720 with loader and backhoe

    Default Re: My worried mind.....

    Lots of views but no replies? Did I leave out something?

  3. #3
    Super Star Member Thomas's Avatar
    Join Date
    Apr 2000
    Posts
    12,253
    Location
    Lebanon,NH.
    Tractor
    Kubota L2800HST w/Frontloader & CC LTX1046

    Default Re: My worried mind.....

    Interesting...
    How long do let the glow plugs warm before staring turning engine?
    Are you useing good winter blend diesel?
    Are you running enough RPM's

  4. #4
    Platinum Member retiredmgn's Avatar
    Join Date
    May 2010
    Posts
    552

    Default Re: My worried mind.....

    Opinions don't cost much so here's mine.
    Contamination. Cracked head or faulty head gasket.
    Coolant is creeping in. The fact that the threads are of a different color within their
    length is telling.
    But, talk is cheap.
    Nelson
    Central Maine

  5. #5
    Veteran Member
    Join Date
    Apr 2000
    Posts
    1,412
    Location
    North Central Arkansas
    Tractor
    John Deere 4520,

    Default Re: My worried mind.....

    I would think the glow plug could be looked at the same way of looking at a spark plug.
    White area the heat burned the fuel away. Black no heat so became fouled
    Maybe recheck the area where the 2 became black. They just mignt be getting lesser voltage. or had loose connection.
    ken

  6. #6
    Gold Member pedalstomper78's Avatar
    Join Date
    Aug 2010
    Posts
    450
    Location
    Ohio
    Tractor
    Case/IH DX33

    Default Re: My worried mind.....

    It could be any one of a number of things. If you're really worried about it, do some tests.
    It's the same in the automotive world as with tractors.....people don't test.
    Go to AutoZone and rent a cooling system pressure tester. You get your money back when you take it back. Put it on the radiator cap, pump it up, see if it holds for 20 minutes. If not, there's a problem that needs looked into farther.
    Suggestion 2, get a compression tester. Need one that's diesel specific, but Harbor Freight has one that works OK for most applications. Run a compression test.

    If those two tests come back normal you can rest at ease. If those show some signs of being "off", well then it's time for farther investigation.

    The forums are a great place to find information....but also a great place to find speculation. Only you can determine the real problems with your tractor. We're here to help you find the correct way to do it.

  7. #7
    Bronze Member
    Join Date
    Oct 2009
    Posts
    80
    Location
    Northern Vermont
    Tractor
    Branson 4720 with loader and backhoe

    Default Re: My worried mind.....

    Thanks to all for the responses! Think I'll be getting those testers.

  8. #8
    Bronze Member
    Join Date
    Oct 2009
    Posts
    80
    Location
    Northern Vermont
    Tractor
    Branson 4720 with loader and backhoe

    Default Re: My worried mind.....

    Thanks to all for the responses! Think I'll be getting those testers.

  9. #9
    Platinum Member
    Join Date
    Oct 2010
    Posts
    541
    Location
    WI
    Tractor
    '13 Yanmar Lx4100

    Default Re: My worried mind.....

    Normal!

    The plug sealing area is the tapered area just above the small electrode, anything above that is NOT sealed to the elements and water and such can leak through the threads and pool up down there and corrode. Dont worry about a thing, if they came out thats your biggest concern as usually they break off because of too much corrosion in that area.
    Last edited by puckgrinder85; 12-30-2012 at 10:51 AM.

  10. #10
    Bronze Member
    Join Date
    Oct 2009
    Posts
    80
    Location
    Northern Vermont
    Tractor
    Branson 4720 with loader and backhoe

    Default Re: My worried mind.....

    Thanks for the info. I took the tractor in to a diesel engine specialist and they confirmed that the white deposit on the glow plugs was normal for precisely the reason you gave.

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