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Thread: Manual; repair of Diana double piston systems

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  1. #1
    Join Date
    Mar 2011
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    Some comments

    Thanks Garvin and Minuteman!

    I haven't seen the original manual for Diana 65 before, it has some nice pictures.

    The general problem with the original manuals I have seen from Diana for the Giss system is that they describe a tool for compressing the springs (fig. 5 in the Diana 65 manual).
    This tool is almost impossible to use, since you are instructed to both press the rear piston in, and while pressing put the cogwheels in. It can be done by two persons, but is still very difficult. Another problem with it is, that the springs tend to curve and can be damaged.
    I recommend the use of the spring compressor described in the manual I wrote for Diana 60 for all Giss systems. Observe the long 3.5mm rod which is used to center the springs and prevent them from curving.

    About the XL sales statistics:
    There will always be lots of factors affecting the prices of the guns. Some are; with scope, Tiroler shaft, special models, "defect", stickers, modifications, with accessories, carrying bag, "no international buyers", ...and a lot more.
    Whenever there is something that is a fact, and can or will affect the price, you will find this as a "comment" in the spreadsheet.
    Condition is not in, being to subjective. The statistics should give an idea about the price level for an average gun, how common they are, and rough price variations. You can also see trends. One example of this is Anschutz 380.

    Regarding Diana 60, some 25% (of 94), are sold as "defect", normally because the original cork seals are gone/pulverized, and the repair is difficult/expensive. Of the more than 1500 FWB300S, only a few were sold as "defect".

    Add: This is almost a dubble post to the one above, sorry. I had some problems with logging in and thought the first post disappeared. /Micke
    Last edited by Micke1; 01-05-2011 at 02:53 PM.

  2. #2
    Join Date
    Mar 2006
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    9,783
    Thanks to Andy (supaspark) providing the necessary scans, anyone who wants to can see the Diana 75 user manual and disassembly instructions at the bottom of the list >>HERE<<.

    Micke, I have one of the original Diana "rod with a handle" type spring compressors. I only ever used it with a Diana mod 60, a few years ago, and it seemed to work OK as I recall. I remember it was hard work to compress the (new) springs while fitting the timing gears but not especially difficult. Maybe it's harder with the larger Giss rifles?
    Last edited by Garvin; 01-05-2011 at 03:36 PM.
    Vintage Airguns Gallery
    ..Above link posted with permission from Gareth W-B
    In British slang an anorak is a person who has a very strong interest in niche subjects.

  3. #3
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    Spring compressor

    The original spring compressor has two problems;
    1. It is really tricky to hold the pressure and at the same time insert the cogwheels.
    2. It only prevents the rear part of the springs from curving/bending.

    I had a conversation with a german guy about this and he said that the original tool works fine if you first insert one of the cogwheels and then push the rear piston in, and twist it to the right position with a screwdriver. When in place, (and the cogs are in the right position, you insert the second cogwheel.
    Now, this may work if you have someone helping you, but is still quite difficult. We are talking about holding the tool in the exact position <0.05mm for a while.

    For this reason I designed the spring compressor (see Diana mod 60 manual), with a rod which you push all the way to the forward piston (to prevent the springs from curving).
    In the next version of this spring compressor I will add an adjustable washer making it possible to adjust of the rear piston to its exact position, with a small lever.

    / Micke

  4. #4
    Join Date
    Mar 2006
    Location
    City of London
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    Quote Originally Posted by Micke1 View Post
    The original spring compressor has two problems;
    1. It is really tricky to hold the pressure and at the same time insert the cogwheels.
    2. It only prevents the rear part of the springs from curving/bending.

    I had a conversation with a german guy about this and he said that the original tool works fine if you first insert one of the cogwheels and then push the rear piston in, and twist it to the right position with a screwdriver. When in place, (and the cogs are in the right position, you insert the second cogwheel.
    Now, this may work if you have someone helping you, but is still quite difficult. We are talking about holding the tool in the exact position <0.05mm for a while.

    For this reason I designed the spring compressor (see Diana mod 60 manual), with a rod which you push all the way to the forward piston (to prevent the springs from curving).
    In the next version of this spring compressor I will add an adjustable washer making it possible to adjust of the rear piston to its exact position, with a small lever.

    / Micke
    Looking at your spring compressor it seems like a much better solution.
    Vintage Airguns Gallery
    ..Above link posted with permission from Gareth W-B
    In British slang an anorak is a person who has a very strong interest in niche subjects.

  5. #5
    Join Date
    Feb 2012
    Location
    montoursville
    Posts
    1

    To Mike1

    I have taken your Swedish instructions and run through a word translator There several words that did not translale. Could I send you a copy and have you fill in the untranslated words. You may keep the revised copy and post to the forum
    JRVETTS

  6. #6
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    Location
    Kloppville- 10,533 miles from Lake Mulwala.
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    I think I have Micke's instructions/strip for the Original 6 pistol in English(supplied by himself IIRC), so if anyone wants a copy, with Micke's permission of course, I can pm it to you.

    Cheers.

    Roy.
    If it moves.....shoot it!..If it don't move.....shoot it in case it tries to!!!
    Light travels faster than sound....this is why I appear bright until you hear me speak!!!

  7. #7
    Join Date
    Mar 2011
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    Havelock Vetinary;

    You can download the english version on this link (MSWord file).

    F.Y.I. and if of interest; I collect the statistics for old match air guns (Anschutz, Diana, FWB), from egun in Germany at this link. It's an XL-file with sales prices for more 3200 guns presently. This file is updated weekly.

    / Micke

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