1991-92 All Models (ATRA TSB 058)

1990 Chevrolet Hi-Cube 7.4 N, 400/M40SECTION 1991-92 All Models (ATRA TSB 058)

Valve body sleeves may be installed incorrectly if casting lines on end of sleeve are not within 10 degrees of vertical. Casting lines are visible without removing valve body. If casting lines are not within 10 degrees of vertical, retaining pin is installed into an oil slot, not into retaining groove. See Fig 1 .

NOTE: Sleeves can be installed incorrectly even if casting lines are within vertical position.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.