(21) Rotax m8 stop washer

€0.20
  Tax included
Reference: FR413.003

The M8 Stop Washer (N ° 21) is a security technical washer placed between the nut and the cylinder base. Its role is to prevent any inconvenient loosening of the high engine mount nuts. On the DD2 motor, where the vibrations and transmission stresses are important, it is essential to ensure the integrity of the motor block.


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🏎️ Full description: What is the purpose of this piece?

The m8 stop washer fills accurate mechanical functions for the Rotax Dd2 :

  1. Maintaining the tightening torque: It acts as a mechanical brake. Once the nut tight at the torque, the washer prevents it from "turning" under the effect of high frequency vibrations of the engine.

  2. Embase protection: It distributes the pressure of the nut on a wider surface and prevents the nut come from "digging" or mark the aluminum of the cylinder during tightening.

  3. Thermal stability: Designed in a specific steel, it retains its pressure properties even when the cylinder reaches its maximum operating temperatures.

  4. Specific Safety DD2: The DD2 engine having a particular architecture with its integrated gearbox, the maintenance of the cylinder must be irreproachable to prevent deformation of the seal plane.


💡 Michel's trick

"Do not make the classic mistake to go up your old whedings all crushed! A stop washer, it has some 'elasticity' or notches that eat with time. If it is flat like a crepe, it is no longer useless. My advice: to Every time you fall the cylinder for a piston, puts slices n ° 21 new. It costs three times nothing and it avits you to find a nut at the bottom of the tub in full race!"


🎓 TUTO: assembly and precautions

  1. The direction of installation: Place the stop washer (No. 21) directly on the stud, against the cylinder base, before screwing the nut (n ° 22).

  2. Cleanliness: Make sure there is no fat or oil on the washer. For it to "hang" well and do its brake job, surfaces must be dry.

  3. Dynamometric tightening: Always use the couple recommended by Rotax (24 nm). The washer is calibrated to provide optimal resistance at this precise pressure.

  4. Visual verification: During your controls between two sleeves, checks that the washer is always well plated. If you see a space, it's because the nut started moving.

FR413.003
14 Items

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In case of return product (unless error on our part)
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