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    DaBomb6988's Avatar
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    425 diagnosis help.

    I have acquired this tractor. Upon getting it home I started to tinker with it. I cleaned the carb added a new battery and it started and runs good. Everything works as it should. My problem is it is smoking, it is a blueish whiteish smoke. It is worse at idle and pretty much clears up at wot. The tractor had been sitting a long time before I got it. Im not sure where to start on diagnosing it.

    I have a decent understanding how things work. I was thinking compression test. How would I check for a bad head gasket?




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    Last edited by DaBomb6988; 04-07-2019 at 08:32 PM.
    raco232 and Toughsox like this.
    John Deere Current: X540, 425, GX345, GT262,
    2520-FEL,

    Sold: 650-FEL, MMM, BrushHog, GT235, LX172

    Ford: LS45 Work in progress fire damage

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    Herminator's Avatar
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    Quote Originally Posted by DaBomb6988 View Post
    I have acquired this tractor. Upon getting it home I started to tinker with it. I cleaned the carb added a new battery and it started and runs good. Everything works as it should. My problem is it is smoking, it is a blueish whiteish smoke. It is worse at idle and pretty much clears up at wot. The tractor had been sitting a long time before I got it. Im not sure where to start on diagnosing it.

    I have a decent understanding how things work. I was thinking compression test. How would I check for a bad head gasket?




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    It sounds like it is not too bad. I would change the oil to make sure it has the right weight in it and mow with it or work it for some time. At least then things will bet back to normal if it has sat for a while and you will have a better idea of how things really are.
    Welcome to Intermission.

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    Blueish smoke is usually indicates oil burning in the cylinder. You didn't mention if you changed the fuel in the tank. Is it possible someone used 2 cycle fuel in there? Just thinking out loud because I came across a fellow with a similar problem recently and found out he was dumping Marvel Mystery Oil into his fuel can because he was told it would make his engine last longer........ I didn't ask him to elaborate.

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    I would run it for a while also. Rings may not be seating the best sitting so long, cylinder crud buildup and running it may work them back into the bore flat and raise the compression. Then do a cold and warm compression test to see how the pressure is. Have fun! More fun if you know it all works right before you put your money and labor into it. I still have to re/mount my modified Mower Deck on my Modified Craftsman's Mower to mow the fence line with this year.Click image for larger version.

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    DaBomb6988's Avatar
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    I cleaned the fuel tank and replaced all the fuel hoses. Should have mentioned that. I will try changing the oil and go from there. Although I probably have a month before I start mowing lol. But that will give me time to paint it.


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    John Deere Current: X540, 425, GX345, GT262,
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    Sold: 650-FEL, MMM, BrushHog, GT235, LX172

    Ford: LS45 Work in progress fire damage

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    425 diagnosis help.

    Update: changed the oil and it is still smoking white/blue after about 2 hours of use. The oil fill cap has a white milk inside it. Im fairly certain it needs head gaskets or a full rebuild. What is the best way to tell if it is just head gaskets or a total rebuild? Compression test? Id rather not tear it apart if I decide on a full replacement. Im confident I could do the head gaskets but piston, rings etc maybe just be out of my comfort zone. Click image for larger version.

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    Last edited by DaBomb6988; 04-11-2019 at 08:00 PM.
    John Deere Current: X540, 425, GX345, GT262,
    2520-FEL,

    Sold: 650-FEL, MMM, BrushHog, GT235, LX172

    Ford: LS45 Work in progress fire damage

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    You could try one of those hand pumps that hooks to the radiator cap. Pressurize it cold and hot. If it won't hold pressure, you know it's gonna need further investigation.

    I would look closely at the intake gaskets before ripping the heads off.

    Also, I have seen a couple of these 425/445's with a cracked cylinder liners.

    Hope it's not that.

    Good Luck!
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    Your #1 diagnostic is pull the sparkplugs and have a look.
    A compression test aint gonna tell much. A cylinder leakdown test will tell you more. You may be able to borrow the tool from an auto parts store. Also as previously mentioned, a cooling system pressure test should point out a bad head gasket. Remove the sparkplugs when you do the test. You may catch a glimpse of coolant seeping into the cylinder.
    In my experience I have seen few blown head gaskets on the 425s.
    Make sure your oil level is not over full.
    As I said.. By reading the color of the plugs will just dang near tell you everything about how your engine is performing. Then use test tools to confirm.
    Happy Hunting!

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    425 diagnosis help.

    So I did a leak down test. Both cylinders had air escaping from the oil fill but not the dipstick. Heres my results with the plugs. The first 2 pics are #1 cylinder right side. Second 2 are the left side. Sounds to me like a bottom end issue. Thoughts?




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    Last edited by DaBomb6988; 04-14-2019 at 06:00 PM.
    John Deere Current: X540, 425, GX345, GT262,
    2520-FEL,

    Sold: 650-FEL, MMM, BrushHog, GT235, LX172

    Ford: LS45 Work in progress fire damage

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