How to remove and install an oil pump in V8 engine on 1991 Pontiac Firebird?

Remove the oil pan. Remove the pump-to-rear main bearing cap bolt and separate the pump and extension shaft from the engine. If installing a new oil pump, transfer the oil pump driveshaft to the new oil pump, ensuring a new nylon sleeve is in place to retain the driveshaft. To install the pump, move it into position and align the slot on the top end of the extension shaft with the drive tang on the lower end of the distributor driveshaft, as the distributor drives the oil pump, making this alignment essential; if necessary, rotate the oil pump driveshaft. Install the oil pump-to-main bearing cap bolt and tighten it to the specified torque. Reinstall the oil pan.

Genuine 1991 Pontiac Firebird Oil Pump

Oil Fluid Pump

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1991 Pontiac Firebird Oil Pump
Part Number: 93427692
$128.54 MSRP: $201.71
You Save: $73.17 (37%)
Product Specifications
- Other Name: PUMP, Engine Oil Pump; Oil Pump, Pump Assembly
- Replaces: 12555884, 03848907, 3848907, 12555284
- Item Weight: 3.20 Pounds
- Item Dimensions: 7.2 x 4.5 x 4.4 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 93427692
- Warranty: This genuine part is guaranteed by GM's factory warranty.
More Info
Fits the following 1991 Pontiac Firebird Submodels:
- 2 DOOR, CONVERTIBLE | 8 Cyl 5.0L, 8 Cyl 5.7L
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1991 Pontiac Firebird Oil Pump Assembly
Part Number: 10118640
Product Specifications
- Other Name: PUMP, Engine Oil Pump; Oil Pump
- Item Weight: 3.20 Pounds
- Item Dimensions: 7.0 x 4.4 x 4.6 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 10118640
- Warranty: This genuine part is guaranteed by GM's factory warranty.
More Info
Fits the following 1991 Pontiac Firebird Submodels:
- 2 DOOR, CONVERTIBLE | 6 Cyl 3.1L, 6 Cyl 3.4L
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1991 Pontiac Firebird Body Kit,Automatic Transmission Fluid Pump
Part Number: 24230108
Product Specifications
- Other Name: BODY, Transmission Oil Pump
- Replaces: 08649964, 8649964
- Item Weight: 5.40 Pounds
- Item Dimensions: 11.3 x 10.7 x 3.5 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 24230108
- Warranty: This genuine part is guaranteed by GM's factory warranty.
More Info
Fits the following 1991 Pontiac Firebird Submodels:
- 2 DOOR, CONVERTIBLE | 4 Cyl 2.5L, 6 Cyl 2.8L, 6 Cyl 3.1L, 6 Cyl 3.4L, 6 Cyl 3.8L, 8 Cyl 5.0L, 8 Cyl 5.7L

1991 Pontiac Firebird Oil Pump

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1991 Pontiac Firebird Oil Pump Parts Questions & Experts Answers

Q:
How to remove and install an oil pump in V8 engine on 1991 Pontiac Firebird?
Posted by Davidbetty P.
A:
Remove the oil pan. Remove the pump-to-rear main bearing cap bolt and separate the pump and extension shaft from the engine. If installing a new oil pump, transfer the oil pump driveshaft to the new oil pump, ensuring a new nylon sleeve is in place to retain the driveshaft. To install the pump, move it into position and align the slot on the top end of the extension shaft with the drive tang on the lower end of the distributor driveshaft, as the distributor drives the oil pump, making this alignment essential; if necessary, rotate the oil pump driveshaft. Install the oil pump-to-main bearing cap bolt and tighten it to the specified torque. Reinstall the oil pan.
Answered by GM Parts Specialist Bob / Apr 04, 2026