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  1. #1
    Silver Member
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    Feb 2004
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    129
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    NorthWest Michigan-UP
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    Massey Ferguson 50,Massey Ferguson 135 gas, Kubota B 3200, Kubota M6040, John Deere 5200

    Default Massey Ferguson 50 Diesel

    I just bought a Massey 50 diesel and can anybody describe the manifold pre-heater? Here in the U.P. of Michigan in the winter I'm having to plug it in to start it and the preheater off the key switch is not working. Looking for a drawing or schematic of the pre-heater to repair or replace.

  2. #2
    Veteran Member Jerry/MT's Avatar
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    Western Montana
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    New Holland TD95D, Ford 4610 & Ferguson TO-30

    Default Re: Massey Ferguson 50 Diesel

    If it has a fuel supply to it coming off the pump return to tank line than it's most likely a Thermostart unit. It dribbles fuel on a heated grided that is activated by a position on the key switch, basiclly lighting a small flame in the intake manifold that warms the incoming air. In the case of my Ford 4610, it's between the run and start position. You hold it there for 30 seconds or so and then engage the starter. The most common problem with them is the fuel line plugs up, the wire from the key switch is an pen circuit, or the heating grid fails. If a starter switch is replaced, it needs to be replace with one that has a position for the Thermostart wire.
    NEVER USE STARTING FLUID WITH A THERMOSTART SYSTEM UNLESS YOU DEACTIVATE THE THERMOSTART. It's been known to blow the manifold off.

  3. #3
    Silver Member
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    Feb 2004
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    NorthWest Michigan-UP
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    Massey Ferguson 50,Massey Ferguson 135 gas, Kubota B 3200, Kubota M6040, John Deere 5200

    Default Re: Massey Ferguson 50 Diesel

    Thanks for the reply Jerry now I have an idea about it. There is a position on the ignition key for pre start but I need to check why it is not working. Until I fix it I will just continue to plug it in.

  4. #4
    Super Member California's Avatar
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    Jan 2004
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    Sonoma County
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    Yanmar YM240, and now just one YM186D

    Default Re: Massey Ferguson 50 Diesel

    Here's what you need. These are widely available (third party) at Tractor Supply etc under $30.





    And here's how the whole system looks. It was an option for Yanmars as well as first used on Perkins engines in MF etc. Different variants were self-refilling via a hose from the injector return line, some Thermostarts had slide-on connectors instead of screw terminals, and I've read there was a version with some odd thread diameter.


  5. #5
    Elite Member The kid's Avatar
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    Middle Tennessee
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    1965 135 gasser, 1967 135 diesel

    Default Re: Massey Ferguson 50 Diesel

    Quote Originally Posted by cointoss View Post
    Thanks for the reply Jerry now I have an idea about it. There is a position on the ignition key for pre start but I need to check why it is not working. Until I fix it I will just continue to plug it in.
    Did a quick search on diagrams for MF50 and found this. I use a program in Windows called "Snipping Tool" to cut out images.

    Attachment 291071

  6. #6
    Silver Member
    Join Date
    Feb 2004
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    129
    Location
    NorthWest Michigan-UP
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    Massey Ferguson 50,Massey Ferguson 135 gas, Kubota B 3200, Kubota M6040, John Deere 5200

    Default Re: Massey Ferguson 50 Diesel

    You guys are the best, thanks!!!

  7. #7
    New Member
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    Feb 2013
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    Location
    Glasgow, KY
    Tractor
    Massey Ferguson 50

    Default Re: Massey Ferguson 50 Diesel

    This is just what I needed, too. Now that I've found it, how do I troubleshoot it? I've tried feeling around the Thermostart and manifold, neither gets warm. What next/ what else?
    Thanks for bringing this up, Cointoss. Thanks for all of the info, everyone else

  8. #8
    Super Member California's Avatar
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    Sonoma County
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    Yanmar YM240, and now just one YM186D

    Default Re: Massey Ferguson 50 Diesel

    Verify you have 12 volts reaching the TS when the key is turned to TS.

    If this checks ok, replace the TS. I've seen them very inexpensive - around $10 + shipping - on ebay.

  9. #9
    New Member
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    Feb 2013
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    Location
    Glasgow, KY
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    Massey Ferguson 50

    Default Re: Massey Ferguson 50 Diesel

    Thanks, California.
    I did that. Voltage checked out. I purchased one online ($20 with shipping). Cranks like a charm!

  10. #10
    Elite Member The kid's Avatar
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    Middle Tennessee
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    1965 135 gasser, 1967 135 diesel

    Default Re: Massey Ferguson 50 Diesel

    Quote Originally Posted by wayacoyote View Post
    Thanks, California.
    I did that. Voltage checked out. I purchased one online ($20 with shipping). Cranks like a charm!
    I would just imagine repair shops hate to love us here on TractorByNet. They only get the jobs that are a real bear to deal with. We are glad you got it fixed. Take care -robert

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