Results 1 to 3 of 3
  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. 

Name:	DSCN2221.jpg 
Views:	258 
Size:	55.6 KB 
ID:	254973

    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. 

Name:	DSCN2207.jpg 
Views:	157 
Size:	26.9 KB 
ID:	254907

    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. 

Name:	DSCN2209.jpg 
Views:	168 
Size:	62.8 KB 
ID:	254906
    Then use the piston to push it in so it's level inside the bore.
    Click image for larger version. 

Name:	DSCN2213.jpg 
Views:	94 
Size:	69.9 KB 
ID:	254908
    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. 

Name:	DSCN2212.jpg 
Views:	124 
Size:	64.6 KB 
ID:	254909
    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. 

Name:	DSCN2223.jpg 
Views:	83 
Size:	58.8 KB 
ID:	254910Click image for larger version. 

Name:	DSCN2222.jpg 
Views:	122 
Size:	64.1 KB 
ID:	254911

    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. 

Name:	DSCN2224.jpg 
Views:	108 
Size:	78.3 KB 
ID:	254912
    If all is well, it should slide in easily and the piston should move easily inside the chamber.
    Click image for larger version. 

Name:	DSCN2227.jpg 
Views:	94 
Size:	86.2 KB 
ID:	254913
    [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.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Installing Piston rings.
    By bowsniper in forum Polaris Open Discussion
    Replies: 14
    Last Post: 04-13-2012, 03:33 PM
  2. How do I install cylinder case on a Ultra 130 di. (how to compress piston rings)
    By dpshook in forum Kawasaki PWC Performance (2-stroke)
    Replies: 1
    Last Post: 09-15-2010, 07:12 AM
  3. piston ring install
    By bowsniper in forum Polaris Open Discussion
    Replies: 6
    Last Post: 06-26-2010, 12:59 PM
  4. piston ring instalation
    By xplayer2885 in forum Polaris Open Discussion
    Replies: 16
    Last Post: 08-22-2008, 09:12 PM
  5. Installing 750 Piston Rings
    By kepneriphone in forum Polaris Open Discussion
    Replies: 25
    Last Post: 06-19-2008, 04:21 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts