How to space piston rings
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Results 1 to 5 of 5
Like Tree1Likes
  • 2 Post By Submariner409
Northstar Engines and System Technical Discussion Discussion, How to space piston rings in Cadillac Engine Technical Discussion; I have a brand new set of rings from perfect circle but I am confused on how to properly space ...
  1. #1
    malibuandryan is offline Cadillac Owners Fanatic
    Automobile(s): 97 Deville Concours and 2000 STS both with NP studs
    Join Date
    Jan 2007
    Location
    INDIANA
    Posts
    110

    How to space piston rings

    I have a brand new set of rings from perfect circle but I am confused on how to properly space them out on the piston. I have three different manuals (ondemand5.com, GM manual, alldatadiy) and they all have the same picture. 84965247.gif
    5.Once the rings are installed, set the ring gaps for the oil control, second and top rings in the positions shown:
    5.1. Oil control ring expander and second compression ring gaps-position 1.
    5.2. Upper oil control ring gap-position 2.
    5.3. Top compression ring gap-position 3.
    5.4. Lower oil control ring gap-position 4.

    Which view are we looking from (left, right, etc...) or does it really matter.

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
    Join Date
    Feb 2006
    Location
    MD Eastern Shore - Kent Island
    Age
    75
    Posts
    46,060

    Re: How to space piston rings

    In this diagram the front of the engine is to your left. You're looking through the top of a piston in Bank 2, and the wristpin axis runs through the piston center line. Flop the diagram for bank 1.

    The actual number of degrees indicated is not terribly critical - close is fine. You'll notice that the top and second compression ring gaps are 180 degrees apart = least gap blowby.

    All ring gap orientation is calculated to allow piston rocking in the bore (wrist pin axis) without unduly distorting the rings - BUT, rings tend to walk around the piston in some bore designs, so this is a starting point for assembly. See the post by dkoz.
    JoeTahoe and JoeTahoe like this.

  4. #3
    dkozloski's Avatar
    dkozloski is online now Cadillac Owners 10000+ Posts
    Automobile(s): 2006 STS V8 AWD, '95 Ford Ranger
    Join Date
    Jul 2004
    Location
    Fairbanks, Ak
    Age
    75
    Posts
    26,937

    Re: How to space piston rings

    Phil Irving who was the chief engineer of Vincent Motorcycles says that unless there is an expander or the rings are pinned at the gaps the rings will rotate on the piston at up to 60RPM. The chance of ring gaps lining up is miniscule unless there is already a score in the cylinder wall to catch them. If you disassemble an engine and find a cylinder scored and the ring gaps lined up, the score came first.

    I ran an aircraft engine overhaul shop for ten years and overhauled hundreds of engines. The only ring gaps I ever saw that hadn't moved around in the cylinder were oil rings with expanders behind them or rings in badly scored cylinders. Most of those were very badly worn and had broken rings that caused the scores.
    Don't mess with Binky Bear!


  5. #4
    daveyhouse is offline Cadillac Owners Fanatic
    Automobile(s): 98 deville D'Elegance 86 Fiero 2m4 / 86 Fiero GT W/SBC
    Join Date
    Jun 2012
    Location
    York, Pa
    Posts
    230

    Re: How to space piston rings

    Sorry to wake an old thread but Sub you mentioned that the diagram in 1st post is bank 2. Is that the left bank? 2,4,6,8

  6. #5
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
    Join Date
    Feb 2006
    Location
    MD Eastern Shore - Kent Island
    Age
    75
    Posts
    46,060

    Re: How to space piston rings

    Use this............... pre-2000 coil/cylinder numbering

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting