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    Cfish1980's Avatar
    Cfish1980 Posts: 14, Reputation: 1
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    #1

    Jun 18, 2013, 12:24 PM
    Murray lawn tractor won't start
    It was running last year when I put it away . Now it won't start the spark plug sparks but it is dry I put my finger over the spark plug hole I feel zero compression
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    smoothy Posts: 25,490, Reputation: 2853
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    #2

    Jun 18, 2013, 12:30 PM
    Sounds like a stuck valve if you have zero compression...

    Was it stored outside or inside?
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    Cfish1980 Posts: 14, Reputation: 1
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    #3

    Jun 18, 2013, 12:35 PM
    In side how would I free stuck valve
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    smoothy Posts: 25,490, Reputation: 2853
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    #4

    Jun 18, 2013, 12:40 PM
    How mechanically inclined are you? There are a number of possible ways... what type of engine is in it.
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    Cfish1980 Posts: 14, Reputation: 1
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    #5

    Jun 18, 2013, 12:44 PM
    I rebuild a few lawn mower 10 years ago
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    smoothy Posts: 25,490, Reputation: 2853
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    #6

    Jun 18, 2013, 12:46 PM
    Quote Originally Posted by Cfish1980 View Post
    I rebuild a few lawn mower 10 years ago
    Is this an Older flat head engine (valve in block) or one of the newer overhead (valve in head) engines?
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    Cfish1980 Posts: 14, Reputation: 1
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    #7

    Jun 18, 2013, 12:47 PM
    Nope not valves looks to be a bad rod piston doesn't move
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    Cfish1980 Posts: 14, Reputation: 1
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    #8

    Jun 18, 2013, 12:48 PM
    Older mid 90's
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    smoothy Posts: 25,490, Reputation: 2853
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    #9

    Jun 18, 2013, 12:53 PM
    Quote Originally Posted by Cfish1980 View Post
    Nope not valves looks to be a bad rod piston dosent move
    Ok... then it got a lot worse...

    I'm betting condensation got into the cylinder and corroed the piston any or rings.

    I once unstuck an engine that got water into it over a winter... stuck solid... spent an hour pounding out the piston with a big hammer and chunk of wood.

    Got in running for another few years (without a single new part)... even though it smoked pretty good.

    You might be better off finding out exactly what engine size and model it is... and looking on a site like eBay for a new or used one...

    It's a lot cheaper than buying a new tractor.

    Example... I lucked into a brand NEW Techumsih 8 hp engine a few years ago for a Snapper mower that was given to me with a thrown rod... Got it for $75 shipped.

    Good luck getting a deal like that... but that's just an example.
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    Cfish1980 Posts: 14, Reputation: 1
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    #10

    Jun 18, 2013, 01:01 PM
    Ok I can move the piston with a screwdriver
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    smoothy Posts: 25,490, Reputation: 2853
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    #11

    Jun 18, 2013, 02:57 PM
    Quote Originally Posted by Cfish1980 View Post
    Ok I can move the piston with a screwdriver
    You can try a tablespoon or two of transmission fluid or light oil in the cylinder and rotate it...

    Not going to be easy to get it in... a few short squirts of penetrating oil if you have it...

    Might be stuck rings if it's that hard to turn over.

    If it is... you are going to have to take it apart to get the corrosion off the parts. Keep in mind this isn't a rebuild or overhaul... but can get it running on an afternoon of your time on the cheap. Even if the life of the engine was compromised by the corrosion.. you might get a few more seasons use out of it.
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    Cfish1980 Posts: 14, Reputation: 1
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    #12

    Jun 22, 2013, 07:37 PM
    On the connecting rid it has the numbers 25-0-44
    Dose this number have to do with selecting the correct connecting rod seeming there are three different sizes with the same part number model# ohv155
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    smoothy Posts: 25,490, Reputation: 2853
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    #13

    Jun 22, 2013, 07:39 PM
    I don't have access to that specific information... I know others that frequent this forum do. Hopefully they will see it soon.
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    Cfish1980 Posts: 14, Reputation: 1
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    #14

    Jun 24, 2013, 11:26 AM
    Ok thank you for your pointers
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    Cfish1980 Posts: 14, Reputation: 1
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    #15

    Jun 26, 2013, 09:15 AM
    What's the standard size of the crank journal min 4.16 mm
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