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  1. #1
    Veteran Member Mechanos's Avatar
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    Default Diesel Compression Tester for Yanmar 3TNE88

    I'm looking for a compression tester with an adapter to fit my Yanmar 3TNE88 engine. Not having much luck. Anyone know where I can get one without having to go through John Deere or Yanmar dealers?

  2. #2
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    Default Re: Diesel Compression Tester for Yanmar 3TNE88

    I am not aware of one otherwise. Was in a hurry so I got from Yanmar, $1,600. Good luck.

  3. #3
    Elite Member dfkrug's Avatar
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    Default Re: Diesel Compression Tester for Yanmar 3TNE88

    [QUOTE=ctlguy;3028770]Was in a hurry so I got from Yanmar, $1,600. QUOTE]

    Holy crap! Why not just make one, or have a machinist do one up custom? I
    understand the hurry, but $1600?!
    See my TBN projects at:
    http://mysite.verizon.net/resyfcgt/

  4. #4
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    Default Re: Diesel Compression Tester for Yanmar 3TNE88

    Yes that is always an option, but machine work isn't exactly cheap either. OEM tools unfortunatly fall under a different catagory than over the counter tools especially when price is concerned, most of the time I find the quality to be there as well. It will get used again (it better !!), and make some money in the process, but yes to buy one, use it once and place on a shelf. Not worth it, you might find out what a repair shop with the acceptable tools to give you a quote for compression test. My situation was a little different as time was my most important issue, I had the kit in my hands the next day and out the door.

  5. #5
    Veteran Member Mechanos's Avatar
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    Default Re: Diesel Compression Tester for Yanmar 3TNE88

    Well, it looks like I found an affordable tester, but it does not come with any adapters. I also located two different adapters for this tester... an 17mm and a 21mm. Now I just need to determine which of the two fits my 3TNE88. I'm pretty sure it's the 21mm, but I need to verify that. I do have a buddy with a lathe and a Bridgeport mill. If it comes to it, I'll have him turn one out for me. If one of these two adapters works, it will be far cheaper than having him jack with it.

  6. #6
    Veteran Member Mechanos's Avatar
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    Default Re: Diesel Compression Tester for Yanmar 3TNE88

    Looks like the injectors are M17's afterall.

  7. #7
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    Default Re: Diesel Compression Tester for Yanmar 3TNE88

    I have one of the Harbor Freight units with 13 different adapters. I am not sure what all of them are thread wise tho...

    Diesel Compression Tester Set - 14 Piece

  8. #8
    Super Member kenmac's Avatar
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    Default Re: Diesel Compression Tester for Yanmar 3TNE88

    If you haven't bought yet, Hoye tractor parts has them




    Yanmar Tractor Parts: COMPRESSION TESTER KIT - READ NOTES!
    Yanmar 3110D
    07 Dodge 2500 5.9 Cummins
    Husky 372xp
    Husky 55 Rancher
    Maruyama trimmer
    Husky trimmer
    Redmax BP blower
    Toro zero turn
    North Star 4 K PSI pressure washer
    Honda 300 4 trax
    Yamaha Timberwolf
    liquid logic coupe kayak
    16' Tow Master Dump Trailer ,20' Yanmar Hauler

  9. #9
    Elite Member dfkrug's Avatar
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    Default Re: Diesel Compression Tester for Yanmar 3TNE88

    Quote Originally Posted by kenmac View Post
    If you haven't bought yet, Hoye tractor parts has them
    I see he makes them on his lathe. Note that there isn't even any threading involved, as the
    injector hole is smooth and a clamp holes it in.

    I admit I have never performed a compression test on a diesel, tho I have many times on
    gas engines and I have rebuilt several JD (Yanmar) direct-injection engines.

    You may want to consider instead performing a leak-down test. That setup is not
    expensive and only has to handle 100psi. Furthermore, it will help pinpoint the
    failing component (rings or valves). That's what I prefer.
    See my TBN projects at:
    http://mysite.verizon.net/resyfcgt/

  10. #10
    Veteran Member Mechanos's Avatar
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    Default Re: Diesel Compression Tester for Yanmar 3TNE88

    Quote Originally Posted by dfkrug View Post
    I see he makes them on his lathe. Note that there isn't even any threading involved, as the
    injector hole is smooth and a clamp holes it in.

    I admit I have never performed a compression test on a diesel, tho I have many times on
    gas engines and I have rebuilt several JD (Yanmar) direct-injection engines.

    You may want to consider instead performing a leak-down test. That setup is not
    expensive and only has to handle 100psi. Furthermore, it will help pinpoint the
    failing component (rings or valves). That's what I prefer.
    Yes, I plan to do a leak down test too. I can use the same adapter for both compression and leak-down. I've also used the leak-down setup to hold the valves in place to install new valve seals with the head still bolted to the engine.

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