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  1. #1

    Installing Piston rings

    Hi All,

    I purchased a set of RIVA pistons and rings. I took some photos of the installation, hope it helps someone.

    Here is the guide that comes with the pistons.

    Piston Install rs1001_1503_84_020.pdf

    There are 3 sets of rings that come with the pistons, oil set, top and bottom ring.

    The top ring is silver. (If you look side on you will see its silver)
    The bottom is grey (as above, except grey).

    Click image for larger version. 

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    Another way to identify the bottom ring is that it has a small dimple on it. If you look carefully at the photo below you will see it.

    Click image for larger version. 

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    First, you need to measure the end gap on the ring. You will need a feeler guage in inches. (All the RIVA measurements are in inches)
    Place the bottom ring inside the cylinder bore. (Grey)

    Click image for larger version. 

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    Then use the piston to push it in so it's level inside the bore.
    Click image for larger version. 

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    The end gap can be in the range of .020 and .022 for the bottom ring.
    With a feeler guage, select the .020 blade and push it in between the gap. It should slide in easily.
    Click image for larger version. 

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    If the feeler guage does not go in (do not force it), then they will need to be filed. Take the ring out, get a small file and file a little off and then go through the same process until the feeler guage fits nicely. If it just slides in and falls you have taken too much off. Don't worry select .021 and see if that fits in nicely. (you have up to .022) This is still within the spec.

    Now do the same for the top ring. The end gap for these is different

    Now, install the oil ring set as per the Riva guide. You do not need to do any filing of this ring. Install the bottom ring and then the top ring. Some things to note for installing the rings:-
    1) The pistons ring gaps have to 120 degrees offset to each other so they are not in a straight line. Best way to do this is to mark the side of the pistons with a pencil and match the gaps to the marks.
    (Note the pencil Mark on the first photo)

    2) Make sure that the gaps are not lined up with position 1 and 2 as per the RIVA guide attached above.

    3) the bottom ring with the small dimple must face up.

    The piston with the top silver ring, the bottom ring and the oil seal ring should look like the first photo above,

    When all that is done, You are ready to push the piston into the bore. You need a ring compression tool ($12 from the local car parts shop)

    Open the tool big enough to fit around the entire piston, coat some oil around the inside of the tool. Place the piston inside and compress the rings. make sure that the oil ring does not slip out of its position other wise you will damage it when you compress the rings.
    Click image for larger version. 

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    Coat the inside of the bore with a little bit of oil. This will make it easy for the piston to slide in. Place the Ring over the bore and push the assembly in.
    Click image for larger version. 

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    If all is well, it should slide in easily and the piston should move easily inside the chamber.
    Click image for larger version. 

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    [LEFT]If it is hard to slide the piston up and down inside the chamber, then you have something wrong, you may have broken a ring or the oil scrapper ring had come off. You need to take the piston back out and check again.

    Anyone anything to add at all?

    Good luck.
    Last edited by pandan9; 01-04-2012 at 07:36 AM.

  2. #2
    monaroman76's Avatar
    Join Date
    Mar 2008
    Whyalla, South Australia
    Nice write up. Probably should be in the how-to section yer?

  3. #3

    I couldn't post it there for some reason.

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