HIGH EFFORT WITH POWER STRG. BROKEN POWER STRG. PUMP BRACE
VEHICLES AFFECTED: 1987 S/T TRUCKS EQUIPPED WITH THE 2.8L (VIN CODE R) ENGINE AND N40 POWER STEERING
Some 1987 S/T trucks equipped with 2.8L engines and power steering may experience high steering effort caused by a broken rear power steering pump brace. If this condition is encountered, it can be repaired by replacing the rear power steering pump brace with a new design brace, P/N 10087543. The new brace should be installed using the following procedure.
1. Raise hood. 2. Remove the two (2) nuts from the power steering brace, see Figure 1A, and discard brace. 3. Remove the lbwer forward exhaust manifold attaching bolt and discard and replace with stud, P/N 14059400, see Figure 1B. 4. Torque stud to 34 Nm (25 lb ft), see Figure 2. 5. Inspect power steering pump mounting bracket for cracks or breakage, see Figure 2. If the bracket is cracked or broken, it must also be replaced at this time using procedures in Section 3B3 of the S/T Service Manual. 6. Attach new rear brace on the power steering pump and manifold studs. Install nuts on pump and manifold studs and HAND TIGHTEN ONLY. 7. Torque nut on rear of power steering pump to 45 Nm (33 lb ft).
Note: It is necessary to torque nut on rear of power steering pump FIRST to correctly position brace. After this has been completed, torque two (2) remaining nuts to 28 Nm (20 lb ft).
8. Retorque lower power steering pump bracket to water pump bolt to 33 Nm (22 lb ft), see Figure 2.
Parts Information
Part Number Description Quantity ----------- ----------- --------
10087543 Brace 1 14059400 Stud 1 11508279 Nut 1
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.
