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Chris-Marine

Piston Ring Expander Unistress / UPRE

The unistress piston ring expander makes sure that is is safe and easy to change piston rings.

  • Lowest stress possible for desired opening of the ring
  • Provided with a stop, limiting deformation of the ring
  • Delivered adjusted and ready for use
  • Suits any type of piston ring and diameter upward of 100 mm
  • The piston ring expander is applicable for a fixed diameter. Price is based on piston ring Ø divided in price categories as indicated below:
  • Prior to quotation request or placing the PO, please see important information further down the page stating necessary specifications required for further handling.

Piston Ring Expander Unistress

Piston Ring Expander Unistress / UPRE: Opens straight-cut piston rings easier

Piston ring expander unistress, UPRE, is a tool designed to open straight-cut piston rings on 4-stroke engines. Each type of UPRE has been provided with a stop. The stop limits the deformation of the piston ring to a minimum, still allowing the piston ring to slip over piston diameter.

Key features

  • Lowest stress possible for a desired opening of the ring
  • Provided with a stop, limiting deformation of the ring
  • Delivered adjusted and ready for use
  • Suits any type of piston ring and diameter upward of 130 mmType 1: piston rings 100–250 mm
    Type 2: piston rings 250–380 mm
    Type 3: piston rings 380–600 mm
    Type 4: piston rings 600–980 mm

When placing your order

When placing your order, please provide the following information:

  • Piston diameter (mm)
  • Piston ring:
    • height (mm)
    • width (mm)
    • cut (type C and type D) – see picture below
  • Oil scraper ring;
    • height (mm)
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Need help choosing the right configuration?

Our technical team can advise on the correct setup for your engine type and operation.

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