Coolant Pump - Leaks/Grinding Noise

Bulletin Number: 93-6-27
Reference Number: 276116
Publish Date: 2/93

Subject:
LEAK AT/NOISY COOLANT PUMP
(REPLACE COOLANT PUMP/INSPECT
TIMING BELT AND IDLER PULLEY)

Models Affected:
1992-93 SUNBIRD MODELS W/2.0L ENG (RPO LE4)
ENGINE VIN: H

CONDITION:

Coolant leaks from the coolant pump and/or there is a grinding noise coming from the coolant pump. There also may be a knocking noise from the timing belt tensioner shifting back and forth.

CAUSE:

A second weep hole was eliminated from some coolant pumps. Coolant may leak past the internal seal into the bearing of these pumps causing premature bearing failure.

CORRECTION:

Replace the coolant pump if it leaks coolant, is noisy, or if the shaft is tight or difficult to turn.





A. If replacing coolant pump with a part from dealer inventory, ONLY USE THE PUMP IF IT HAS TWO (2) WEEP HOLES. (Refer to Figure 1.)

Coolant pumps with one (1) weep hole should be returned to GMSPO. Please use GMSPO form PC 659. Indicate "SPECIAL RETURN".

B. If replacing coolant pump with the new part (GM P/N 93215645), it will have two (2) weep holes.

Inspect the timing belt and cover and replace it as necessary if there are cracks or visible damage.





Inspect the timing belt tensioner for damage and replace it if the arm is cracked or broken (refer to Figure 2).

SERVICE INFORMATION:

1. Identify that the coolant pump is leaking or that it is the source of the noise.

2. Remove the coolant pump (refer to Section 6B of the 1992 or 1993 Sunbird Service Manual for removal procedure).

3. Inspect the timing belt tensioner for cracked or broken tensioner arm. (Refer to Figure 2.) Replace timing belt tensioner if arm is cracked or broken.

4. Install the new coolant pump (refer to Section 6B of the 1992 or 1993 Sunbird Service Manual for installation procedure). Be sure the new coolant pump has two weep holes.

VEHICLE BREAKPOINT INFORMATION:

The breakpoints identify the vehicles that may be affected with this condition:

PARTS INFORMATION:

Part Number Part Description

93215645 Kit, Coolant Pump (New part number with
two (2) weep holes)

Parts are currently available from GMSPO.

Refer to Parts Catalog Tensioner, Timing Belt (Replace as necessary)
Refer to Parts Catalog Belt, Timing (Replace as necessary)
Refer to Parts Catalog Cover, Timing Belt (Replace as necessary)

WARRANTY INFORMATION:

Labor Time operation Number:
J3480

Labor Time Allowance:
2.2 Hours

ADD A:
with A/C
0.1 Hour