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  1. #11
    Veteran Member Mechanos's Avatar
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    JD 955/70A/7 TLB

    Default Re: Diesel Compression Tester for Yanmar 3TNE88

    Rained out on my project, so I thought I do some prep for the compression test. Fabricated a hold down plate for the compression tester adapter and tried to pull one of the injectors just to see if I could get it out. Couldn't get it to budge without a puller, so I'll have to work up a puller to use with my slide hammer. The only thing to attach the puller to is the threads for the fuel line fitting. I don't have a spare fuel line fitting so I'll need to come up with something else to thread onto the injector. So far, I haven't been able to figure out what the thread size and pitch is on the injector.

  2. #12
    Veteran Member Mechanos's Avatar
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    Default Re: Diesel Compression Tester for Yanmar 3TNE88

    Gave up trying to determine the thread size on the injectors and just ordered the Yanmar injector puller tool. Should be here in about a week. In the mean-time, I'm just twiddling my thumbs... still rained out on the project and this would be the perfect time to be fiddling with the tractor, but I can't even do that until the tools come in.

  3. #13
    Elite Member dfkrug's Avatar
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    05 Kioti CK30HST w/ Prairie Dog backhoe

    Default Re: Diesel Compression Tester for Yanmar 3TNE88

    Quote Originally Posted by Mechanos View Post
    The only thing to attach the puller to is the threads for the fuel line fitting.
    I don't have a spare fuel line fitting so I'll need to come up with something else to thread onto the injector.
    All these injectors are hard to remove, in my experience. I left the fuel line installed and pried
    carefully on it to get it started, then removed the line. This gave me something to grab with a
    small vise-grips to turn the injector, while prying on the vise-grips. Of course, my engine was
    out, so I had all sorts of working room.

    There is a seal at the bottom of the injector hole that sometimes comes out with the injector,
    and sometimes not.

    Good luck.
    See my TBN projects at:
    http://mysite.verizon.net/resyfcgt/

  4. #14
    Veteran Member Mechanos's Avatar
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    Default Re: Diesel Compression Tester for Yanmar 3TNE88

    Quote Originally Posted by dfkrug View Post
    All these injectors are hard to remove, in my experience. I left the fuel line installed and pried
    carefully on it to get it started, then removed the line. This gave me something to grab with a
    small vise-grips to turn the injector, while prying on the vise-grips. Of course, my engine was
    out, so I had all sorts of working room.

    There is a seal at the bottom of the injector hole that sometimes comes out with the injector,
    and sometimes not.

    Good luck.
    Thanks for the info. Is the seal a copper washer type seal? Do you know if they typically need to be replaced when an injector is pulled? Or can they be re-used?

    I've been spraying the injectors with penetrating oil hoping to loosen them up in their bores. Hopefully the puller & slide hammer will make short work of them.

  5. #15
    Elite Member dfkrug's Avatar
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    05 Kioti CK30HST w/ Prairie Dog backhoe

    Default Re: Diesel Compression Tester for Yanmar 3TNE88

    Quote Originally Posted by Mechanos View Post
    Is the seal a copper washer type seal? Do you know if they
    typically need to be replaced when an injector is pulled? Or can they be re-used?
    They were some kinda plastic, as I recall. I installed all new in one case, and re-used in
    another. If they don't come out with the injector, I do not know how you get them
    out without damaging them. "Standard" engine re-build guidelines prob call for
    replacing, but I had no problems re-using the old ones. If you are going to order a
    bunch of other parts, I would get new ones.
    See my TBN projects at:
    http://mysite.verizon.net/resyfcgt/

  6. #16
    Veteran Member Mechanos's Avatar
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    Default Re: Diesel Compression Tester for Yanmar 3TNE88

    Quote Originally Posted by dfkrug View Post
    They were some kinda plastic, as I recall. I installed all new in one case, and re-used in
    another. If they don't come out with the injector, I do not know how you get them
    out without damaging them. "Standard" engine re-build guidelines prob call for
    replacing, but I had no problems re-using the old ones. If you are going to order a
    bunch of other parts, I would get new ones.
    I agree. For now, I am just wanting to perform a compression test and a leak down test, but wasn't sure if the seals were reusable. If the head has to come off, then new seals would be installed. Thanks

  7. #17
    Veteran Member Mechanos's Avatar
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    Default Re: Diesel Compression Tester for Yanmar 3TNE88

    Got a call from the Yanmar dealer... my injector puller came in. Picked it up today and there was little unmentioned surprise. They didn't bother to tell me that there was a freight charge for them to order it in on the stock order, so my $33 puller ended up costing $50 with freight and tax. Just like getting stuff from JD, it's a rediculous price for what it is... basically it's just a coupler nut that has been bored out on one end and re-threaded to screw onto the injector. The slide hammer threads into the other end. Now if I could just get the dang compression tester adapter. It's on back-order so I'm still waiting.......

  8. #18
    Veteran Member Mechanos's Avatar
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    Default Re: Diesel Compression Tester for Yanmar 3TNE88

    I got tired of getting jacked around by the company with the back-ordered adapter... they would give me a date, then when I'd call, they'd push it back again. Cancelled that order and found another place that had one in-stock and ordered it.

  9. #19
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    Ohio
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    Ford x00, JD, Mustang

    Default Re: Diesel Compression Tester for Yanmar 3TNE88

    Quote Originally Posted by Mechanos View Post
    I got tired of getting jacked around by the company with the back-ordered adapter... they would give me a date, then when I'd call, they'd push it back again. Cancelled that order and found another place that had one in-stock and ordered it.
    I am looking to do the same thing on my 4TN82 Yanmar - where did you get the adapter and what compression tester did you use - diesels are new to me - spark plugs are much easier...

    Thanks in advance!

  10. #20
    Silver Member
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    Eastern KS
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    JD 4100 HST CUT Yanmar 3TNE74

    Default Re: Diesel Compression Tester for Yanmar 3TNE88

    Would this work -- 12 Piece Diesel Engine Compression Tester

    This one -- Diesel Compression Tester Set - 14 Piece -- seems to have the tractor adapters but costs $125 more. I have a Yanmar 3TNE74 - 3 cyclinder.

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