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  1. #1
    Elite Member
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    Default LEAKDOWN TEST

    Has anyone ever tried a "leakdown test" on diesel engines the way they do on small gas engines? It should work if you can inject air into the combustion chamber.

  2. #2
    Super Star Member RoyJackson's Avatar
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    Bethel, Vermont
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    John Deere 4400 MFWD, Deere 855D UTV and assorted implements

    Default Re: LEAKDOWN TEST

    A buddy of mine does it on Mercedes Benz diesels. Biggest difference is the fittings you use and you've got to pulll the injectors (that's where the cylinder is pressurized).

  3. #3
    Platinum Member
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    MAINE
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    ISEKI TL3201 38h.p. 4x4

    Default Re: LEAKDOWN TEST

    extrulate on this one guys???why and how???know my engines firly well but are u tryin to figure out if u have bad rings????or leaking valves??/..we used to always take comrression tester..test dry and then add a little oil in one cylinder at a tme and then do another compression test and figure out the differences...u r looking for an average ...or a particularly bad cyl...???/ [img]/forums/images/graemlins/grin.gif[/img]

  4. #4
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    Default Re: LEAKDOWN TEST

    Assuming the compression test is low, you crank the engine to TDC, valves closed, and pump 30-40# of air into cylinder via sparkplug hole or fuel injector. listen through air intake for intake valve leakage, exhaust for exhaust valve leak, crankcase vent for ring blowby leakage, (some expected at end gaps), check for bubbles in radiator or spray soap and watch for bubbles around head gasket. Never tried it but I would used a piece of tubing as a stethoscope. You can buy fittings for sparkplug holes, and I guess, get creative for diesels.

  5. #5
    Platinum Member
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    Apr 2004
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    MAINE
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    ISEKI TL3201 38h.p. 4x4

    Default Re: LEAKDOWN TEST

    learn something everyday [img]/forums/images/graemlins/grin.gif[/img] [img]/forums/images/graemlins/grin.gif[/img] [img]/forums/images/graemlins/grin.gif[/img]

  6. #6
    Elite Member SnowRidge's Avatar
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    East Tennessee
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    Power Trac PT-425 / Branson 3520

    Default Re: LEAKDOWN TEST

    </font><font color="blue" class="small">( extrulate on this one guys???why and how???know my engines firly well but are u tryin to figure out if u have bad rings????or leaking valves??/..we used to always take comrression tester..test dry and then add a little oil in one cylinder at a tme and then do another compression test and figure out the differences...u r looking for an average ...or a particularly bad cyl...???/ )</font>

    Some of the small engines have automatic compression releases to aid in starting. This renders compression testers useless for qualitative purposes. A leakdown test is used instead.

    SnowRidge

  7. #7
    Super Member Inspector507's Avatar
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    Default Re: LEAKDOWN TEST

    SnowRidge,
    Look at the attached........looks close
    Attached Images Attached Images

  8. #8
    Elite Member SnowRidge's Avatar
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    Default Re: LEAKDOWN TEST

    </font><font color="blue" class="small">( Look at the attached........looks close )</font>

    Hmmm, Bubba's lookin' kinda glassy eyed. Too much catnip?

    SnowRidge

  9. #9
    Super Member Inspector507's Avatar
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    Central Ohio

    Default Re: LEAKDOWN TEST

    He does well with catnip, but the female cat of the house, Bitsy, gets mean. We don't allow catnip anywhere her [img]/forums/images/graemlins/grin.gif[/img]
    Little Miss Priss who won't drink normally (see attached)
    Attached Images Attached Images

  10. #10
    Elite Member SnowRidge's Avatar
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    East Tennessee
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    Power Trac PT-425 / Branson 3520

    Default Re: LEAKDOWN TEST

    </font><font color="blue" class="small">( Little Miss Priss who won't drink normally )</font>

    Quite a coincidence, our female feline drinks the same way sometimes.

    SnowRidge

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