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48iS-U SECTION 48iS/U: EXHAUST SYSTEM

Reflects improved design for the cylinder #1 & #2 exhaust assemblies. Updated instructions.

48iS-U_12iS

    Changelog

  • 05/06/2021

    REASON FOR REVISION:  Add improved installation sequence for Cylinder #1 exhaust assembly, add information regarding 912iS EGT wire routing.

    REVISION DESCRIPTION:

    KAI Page 48iS/U-05 REV 3:

    • Before Step 2, added “NOTE: The Cylinder #1 Exhaust Assembly is called out by its components as shown in Figure 2 during the installation process and as an assembly once installed.”
    • In Step 2, ”Identify the EX-00021E as shown in Figure 2, then install the EX-00021E into the right side forward exhaust port as shown in Figure 1. Tighten the exhaust nuts until the EX-00021E is seated in the cylinder, but still free to rotate with light pressure.”  was “Install the upper segment of the EX-00021-1 into the right side forward exhaust port as shown in Figure 1. Start the exhaust stud nuts onto the studs but do not tighten further than the point at which the exhaust stud begins to extend beyond the end of the nut.”
    • In Step 3, “…Figure 3.” Was “…Figure 2.”
    • Added Figure 2, renumbered subsequent figures.
    • In Figure 1, “EX-00021E, (912ULS: EX-00026A)“ was “EX-00021-1 UPPER SEGMENT (912ULS: EX-00026-1 UPPER SEGMENT)”

    KAI Page 48iS/U-07 REV 3:

    • All steps re-ordered and details added to clarify installation of Cylinder #1 exhaust assembly.
    • In Figure 1, EX-00021-1 callout replaced by EX-00021E, EX-00021B, EX-00021D callouts.

    KAI Page 48iS/U-09 REV 3:

    • Added to Step 2 and Step 4: “If necessary to allow sufficient slack in the EGT wire, loosen, rotate and retighten the bracket holding the plug at the upper end of the wire.”
  • 12/22/2020

    REVISION DESCRIPTION:

    • KAI Page 48iS/U-01 REV 2: “EX-00021-1” was “EX-00021”, “(912ULS: EX-00026-1)” was “(912ULS: EX-00026)”.
      “EX-00022-2” was EX-00022-1”, (912ULS: EX-00027-2)” was “(912ULS: EX-00027-1)”
    • KAI Page 48iS/U-02 REV 1: In Step 1: “Mark 23 locations around each long edge of the FF-00090H Heat Muff Outer, starting 1.3 in [33.02 mm] from one end of the FF-00090H and spaced 0.9 in [ 22.86 mm] apart around the circumference.” was “Mark 12 locations around each long edge of the FF-00090H Heat Muff Outer, starting 1.3 in [33.02 mm] from one end of the FF-00090H and spaced 1.8 in [ 45.72 mm] apart around the circumference.”
      • In Step 2, “Make small flutes in alternating directions at the marked locations…” was “Make small flutes at the marked locations…”
      • Revised Figure 1 to show alternating flute directions.
    • KAI Page 48iS/U-03 REV 2: Figure 4 redrawn to depict alternating flute directions.
    • KAI Page 48iS/U-04 REV 1: In Step 5, “Secure the FF-00090H Using the clamps called out in Figure 4, positioned as shown…” was “Secure the FF-00090H using the clamps called out in Figure 3…”
      • Figure 3 Redrawn, Added Figure 4.
    • KAI Page 48iS/U-05 REV 2: In Step 2, “Install the upper segment of the EX-00021-1 into…” was “Install the EX-00021 into…”
      • In Step 3, “Install the EX-00022-2 into…” was “Install the EX-00022-1 into…”
      • In Figure 1, “EX-00021-1 UPPER SEGMENT (912ULS: EX:00026-1 UPPER SEGMENT)” was “EX-00021 (912ULS: EX:00026)”.
      • In Figure 2, “EX-00022-2 (912ULS: EX:00027-2)” was “EX-00022-1 (912ULS: EX:00027-1)”.
    • KAI Page 48iS/U-07 REV 2: Added Step 1.
      • Renumbered steps 2 through 8.
      • In Step 5, “ …both springs on the Cylinder #2 exhaust (EX-00022-2) and Cylinder #4 exhaust (EX-00024). Adjust…” was “…both springs on the Cylinder #4 exhaust (EX-00024). Adjust…”
      • Figure 1 redrawn to depict EX-00021-1 and EX-00022-2.
    • KAI Page 48iS/U-08 REV 1: Figure 1 and detail view redrawn to depict EX-00021-1 and EX-00022-2.
    • KAI Page 48iS/U-09 REV 2: In Figure 1, “EX-00021-1” was “EX-00021.
      • Figure 1 redrawn to depict EX-00021-1.
      • In Figure 2, “EX-00022-2” was “EX-00022-1”
      • Figure 2 redrawn to depict EX-00022-2.
    • KAI Page 48iS/U-10 REV 1: Figure 1 redrawn to depict EX-00021-1.
      • Figure 2 redrawn to depict EX-00022-2.
    • KAI Page 48iS/U-11 REV 1: Figure 1 redrawn to depict EX-00026-1.
      • Figure 2 redrawn to depict EX-00027-2.

    RELATED SERVICE INFORMATION DOCUMENTATION:

    • SB-00013: RV-12iS EX-00022-1 Cracking

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