How to remove and install an oil pump on V8 engine for Chevrolet Avalanche,Silverado,Suburban,Tahoe,GMC Sierra,Yukon,Yukon Denali,Yukon XL?

Remove the timing chain cover and oil pan. Remove the oil pump pick-up tube mounting nuts and bolts and lower the pick-up tube and screen assembly from the vehicle. Remove the oil pump retaining bolts and slide the pump off the end of the crankshaft. Remove the oil pump cover and withdraw the rotors from the pump body. Clean the components with solvent, dry them thoroughly, and inspect for any obvious damage. Also, check the bolt holes for damaged threads and the splined surfaces on the crank-shaft sprocket for any apparent damage. If any of the components are scored, scratched, or worn, replace the entire oil pump assembly. There are no serviceable parts currently available. Prime the pump by pouring clean engine oil into the pick-up tube hole, while turning the pump by hand. Position the oil pump over the end of the crankshaft and align the teeth on the crankshaft sprocket with the teeth on the oil pump drive gear. Making sure the pump is fully seated against the block. Install the oil pump mounting bolts and tighten them to the proper torque specifications. Install a new O-ring on the oil pump pick-up tube, then fasten it to the oil pump and the engine block main studs. Install and align the timing chain cover, then install the oil pan. The remainder of installation is the reverse of removal. Add oil and coolant as necessary. Run the engine and check for oil and coolant leaks. Also, check the oil pressure.

How to remove and install an oil pump on 4.3L V6 engine for Chevrolet Avalanche,Silverado,Suburban,Tahoe,GMC Sierra,Yukon,Yukon Denali and Yukon XL?

Remove the oil pan. While supporting the oil pump, remove the pump-to-rear main bearing cap bolt. Lower the pump and remove it along with the pump driveshaft. If a new oil pump is installed, make sure the pump driveshaft is mated with the shaft inside the pump and a new driveshaft retainer is used. Position the pump over the dowel pins on the rear main cap and make sure the slot in the upper end of the driveshaft is aligned with the tang on the lower end of the oil pump driveshaft. The oil pump driveshaft drives the oil pump, so it is absolutely essential that the components mate properly. Also, note that no gasket is used between the oil pump and the rear main cap. Install the mounting bolt and tighten it to the torque specifications. Install the oil pan and refill the engine with fresh oil. The remainder of assembly is the reverse of the disassembly procedures.

Genuine GMC Sierra Oil Pump

Oil Fluid Pump

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GMC Sierra Pump Assembly, Oil
Part Number: 12686433
$154.72 MSRP: $238.09
You Save: $83.37 (36%)
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Product Specifications
- Other Name: Dipstick, Oil Pump
- Replaces: 12673984, 12665356, 12661761, 12659938, 12657346, 12661206, 12677143
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2014-2019 GMC Sierra | 1500 CREW CAB, 1500 CREW CAB STANDARD BOX, 1500 DOUBLE CAB STANDARD BOX, 1500 REGULAR CAB LONG BOX, 1500 REGULAR CAB STANDARD BOX, CREW CAB 1/2 TON | 6 Cyl 4.3L, 8 Cyl 5.3L, 8 Cyl 6.2L
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GMC Sierra Pump Assembly, Oil
Part Number: 12710303
$110.85 MSRP: $176.86
You Save: $66.01 (38%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Oil Pump
- Replaces: 12563570, 12696357, 12563964, 12678151, 12586665
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1999-2019 GMC Sierra | 1 TON CREW CAB, 1500 CREW CAB LONG BOX, 1500 CREW CAB STANDARD BOX, 1500 EXTENDED CAB LONG BOX, 1500 EXTENDED CAB SHORT BOX, 1500 EXTENDED CAB STANDARD BOX, 1500 REGULAR CAB LONG BOX, 1500 REGULAR CAB STANDARD BOX, 2500 CREW CAB LONG BOX, 2500 CREW CAB STANDARD BOX, 2500 EXTENDED CAB LONG BOX, 2500 EXTENDED CAB STANDARD BOX, 2500 REGULAR CAB, 2500 REGULAR CAB STANDARD BOX, 3500 CHASSIS EXTENDED CAB 161.5, 3500 CHASSIS EXTENDED CAB 185.5, 3500 CHASSIS REGULAR CAB 137.0, 3500 CHASSIS REGULAR CAB 161.5, 3500 CREW CAB, 3500 CREW CAB LONG BOX, 3500 CREW CAB ONLY, 3500 CREW CAB STANDARD BOX, 3500 DOUBLE CAB LONG BOX, 3500 EXTENDED CAB, 3500 REGULAR CAB, CLASSIC 1500 CREW CAB LONG BOX, CLASSIC 1500 CREW CAB STANDARD BOX, CLASSIC 1500 EXTENDED CAB LONG BOX, CLASSIC 1500 EXTENDED CAB SHORT BOX, CLASSIC 1500 EXTENDED CAB STANDARD BOX, CLASSIC 1500 REGULAR CAB LONG BOX, CLASSIC 1500 REGULAR CAB STANDARD BOX, CLASSIC 2500 CREW CAB LONG BOX, CLASSIC 2500 CREW CAB STANDARD BOX, CLASSIC 2500 EXTENDED CAB LONG BOX, CLASSIC 2500 EXTENDED CAB STANDARD BOX, CLASSIC 2500 REGULAR CAB, CLASSIC 3500 CHASSIS EXTENDED CAB 161.5, CLASSIC 3500 CHASSIS REGULAR CAB 137.0, CLASSIC 3500 CHASSIS REGULAR CAB 161.5, CLASSIC 3500 CREW CAB, CLASSIC 3500 EXTENDED CAB, CLASSIC 3500 REGULAR CAB, CREW CAB 1 TON, CREW CAB 1 TON 119.0, CREW CAB 1 TON 137.0, CREW CAB 1/2 TON, CREW CAB 2500 LONG BOX, CREW CAB 6'6" BOX 3/4 TON, CREW CAB 8' BOX 3/4 TON, DOUBLE CAB 2500 LONG BOX, DOUBLE CAB 2500 STANDARD BOX, EXTENDED CAB 1 TON, EXTENDED CAB 5'8" BOX 1/2 TON, EXTENDED CAB 6'6" BOX 1/2 TON, EXTENDED CAB 6'6" BOX 3/4 TON, EXTENDED CAB 8' BOX 1/2 TON, EXTENDED CAB 8' BOX 3/4 TON, EXTENDED CAB CHASSIS 1 TON 161.5, EXTENDED CREW CAB 1 TON 161.5, REGULAR CAB 1 TON, REGULAR CAB 3/4 TON, REGULAR CAB 6'6" BOX 1/2 TON, REGULAR CAB 8' BOX 1/2 TON, REGULAR CAB CHASSIS 1 TON 137.0, REGULAR CAB CHASSIS 1 TON 161.5 | 8 Cyl 4.8L, 8 Cyl 4.8L Flex, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L, 8 Cyl 6.0L Flex
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GMC Sierra Pump,Oil
Part Number: 93442037
$153.96 MSRP: $267.94
You Save: $113.98 (43%)
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Product Specifications
- Other Name: PUMP, Engine Oil Pump; Oil Pump
- Replaces: 12555283
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1999-2013 GMC Sierra | 1500 EXTENDED CAB LONG BOX, 1500 EXTENDED CAB SHORT BOX, 1500 EXTENDED CAB STANDARD BOX, 1500 REGULAR CAB LONG BOX, 1500 REGULAR CAB STANDARD BOX, 3500 CHASSIS REGULAR CAB 137.0, CLASSIC 1500 EXTENDED CAB LONG BOX, CLASSIC 1500 EXTENDED CAB SHORT BOX, CLASSIC 1500 EXTENDED CAB STANDARD BOX, CLASSIC 1500 REGULAR CAB LONG BOX, CLASSIC 1500 REGULAR CAB STANDARD BOX, CLASSIC 3500 CHASSIS REGULAR CAB 137.0, EXTENDED CAB 5'8" BOX 1/2 TON, EXTENDED CAB 6'6" BOX 1/2 TON, EXTENDED CAB 8' BOX 1/2 TON, REGULAR CAB 6'6" BOX 1/2 TON, REGULAR CAB 8' BOX 1/2 TON | 6 Cyl 4.3L
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GMC Sierra Pump Assembly, Oil
Part Number: 12623423
$92.41 MSRP: $160.87
You Save: $68.46 (43%)
ADD TO CART
Product Specifications
- Other Name: PUMP, Engine Oil Pump; Oil Pump
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2009-2013 GMC Sierra | CREW CAB 1/2 TON, EXTENDED CAB 5'8" BOX 1/2 TON, EXTENDED CAB 6'6" BOX 1/2 TON, EXTENDED CAB 8' BOX 1/2 TON, REGULAR CAB 6'6" BOX 1/2 TON, REGULAR CAB 8' BOX 1/2 TON | 8 Cyl 6.0L, 8 Cyl 6.0L Flex
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GMC Sierra Pump Assembly, Oil
Part Number: 12644591
$153.93 MSRP: $267.92
You Save: $113.99 (43%)
ADD TO CART
Product Specifications
- Other Name: PUMP, Engine Oil Pump; Oil Pump
- Replaces: 12632219
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2011-2016 GMC Sierra | 1 TON CREW CAB, 2500 CREW CAB STANDARD BOX, 2500 REGULAR CAB, 2500 REGULAR CAB STANDARD BOX, 3500 CREW CAB LONG BOX, 3500 CREW CAB ONLY, 3500 CREW CAB STANDARD BOX, 3500 DOUBLE CAB LONG BOX, 3500 REGULAR CAB, CREW CAB 1 TON, CREW CAB 1 TON 119.0, CREW CAB 1 TON 137.0, CREW CAB 2500 LONG BOX, CREW CAB 6'6" BOX 3/4 TON, CREW CAB 8' BOX 3/4 TON, DOUBLE CAB 2500 LONG BOX, DOUBLE CAB 2500 STANDARD BOX, EXTENDED CAB 1 TON, EXTENDED CAB 6'6" BOX 3/4 TON, EXTENDED CAB 8' BOX 3/4 TON, EXTENDED CAB CHASSIS 1 TON 161.5, EXTENDED CREW CAB 1 TON 161.5, REGULAR CAB 1 TON, REGULAR CAB 3/4 TON, REGULAR CAB CHASSIS 1 TON 137.0, REGULAR CAB CHASSIS 1 TON 161.5 | 8 Cyl 6.6L Diesel
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GMC Sierra Pump Assembly, Oil
Part Number: 12698353
$78.03 MSRP: $122.76
You Save: $44.73 (37%)
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Product Specifications
- Other Name: Oil Pump
- Replaced by: 12731660
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2019-2021 GMC Sierra | CREW CAB 1 TON CHASSIS 137.0, CREW CAB 5'8" BOX 1/2 TON, CREW CAB 6'6" BOX 1 TON, CREW CAB 6'6" BOX 1/2 TON, CREW CAB 6'6" BOX 3/4 TON, CREW CAB 8' BOX 1 TON, CREW CAB 8' BOX 3/4 TON, EXTENDED CAB 6'6" BOX 1/2 TON, EXTENDED CAB 6'6" BOX 3/4 TON, EXTENDED CAB 8' BOX 1 TON, EXTENDED CAB 8' BOX 3/4 TON, EXTENDED CREW CAB 1 TON CHASSIS 161.5, REGULAR CAB 1 TON CHASSIS 137.0, REGULAR CAB 1 TON CHASSIS 161.5, REGULAR CAB 8' BOX 1 TON, REGULAR CAB 8' BOX 3/4 TON | 8 Cyl 6.2L, 8 Cyl 6.6L
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GMC Sierra Pump Assembly, Oil
Part Number: 12698354
$91.89 MSRP: $135.27
You Save: $43.38 (33%)
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Product Specifications
- Other Name: Oil Pump
- Replaced by: 12731661
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2019-2021 GMC Sierra | CREW CAB 5'8" 1/2 TON, CREW CAB 5'8" BOX 1/2 TON, CREW CAB 6'6" BOX 1/2 TON, EXTENDED CAB 6'6" BOX 1/2 TON, EXTENDED CAB 8' BOX 1/2 TON, REGULAR CAB 6'6" BOX 1/2 TON, REGULAR CAB 8' BOX 1/2 TON | 6 Cyl 4.3L, 8 Cyl 5.3L, 8 Cyl5.3L
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GMC Sierra Pump Assembly, Oil
Part Number: 12678662
$82.63 MSRP: $143.80
You Save: $61.17 (43%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Oil Pump
- Replaced by: 12731119
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2017-2021 GMC Sierra | 2500 CREW CAB STANDARD BOX, 2500 REGULAR CAB, 2500 REGULAR CAB STANDARD BOX, 3500 CREW CAB LONG BOX, 3500 CREW CAB ONLY, 3500 CREW CAB STANDARD BOX, 3500 DOUBLE CAB LONG BOX, 3500 REGULAR CAB, CREW CAB 1 TON CHASSIS 137.0, CREW CAB 2500 LONG BOX, CREW CAB 6'6" BOX 1 TON, CREW CAB 6'6" BOX 3/4 TON, CREW CAB 8' BOX 1 TON, CREW CAB 8' BOX 3/4 TON, DOUBLE CAB 2500 LONG BOX, DOUBLE CAB 2500 STANDARD BOX, EXTENDED CAB 6'6" BOX 3/4 TON, EXTENDED CAB 8' BOX 1 TON, EXTENDED CAB 8' BOX 3/4 TON, EXTENDED CREW CAB 1 TON CHASSIS 161.5, REGULAR CAB 1 TON CHASSIS 137.0, REGULAR CAB 1 TON CHASSIS 161.5, REGULAR CAB 8' BOX 1 TON, REGULAR CAB 8' BOX 3/4 TON | 8 Cyl 6.6L Diesel
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GMC Sierra Pump Assembly, Oil
Part Number: 55508996
$119.65 MSRP: $189.07
You Save: $69.42 (37%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Oil Pump
- Replaced by: 40009011
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2020-2021 GMC Sierra | CREW CAB 5'8" 1/2 TON, CREW CAB 5'8" BOX 1/2 TON, CREW CAB 6'6" BOX 1/2 TON, EXTENDED CAB 6'6" BOX 1/2 TON | 6 Cyl 3.0L Diesel
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GMC Sierra Pump Assembly, Oil
Part Number: 12693045
$104.15 MSRP: $163.84
You Save: $59.69 (37%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Oil Pump
- Replaced by: 12724348
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2019-2021 GMC Sierra | CREW CAB 5'8" 1/2 TON, CREW CAB 5'8" BOX 1/2 TON, CREW CAB 6'6" BOX 1/2 TON, EXTENDED CAB 6'6" BOX 1/2 TON, EXTENDED CAB 8' BOX 1/2 TON, REGULAR CAB 6'6" BOX 1/2 TON, REGULAR CAB 8' BOX 1/2 TON | 4 Cyl 2.7L
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GMC Sierra Pump Assembly, A/Trns Fluid
Part Number: 24294740
$141.59 MSRP: $223.74
You Save: $82.15 (37%)
Ships in 1-3 Business Days
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Product Specifications
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2020-2021 GMC Sierra | CREW CAB 1 TON CHASSIS 137.0, CREW CAB 6'6" BOX 1 TON, CREW CAB 6'6" BOX 3/4 TON, CREW CAB 8' BOX 1 TON, CREW CAB 8' BOX 3/4 TON, EXTENDED CAB 6'6" BOX 3/4 TON, EXTENDED CAB 8' BOX 1 TON, EXTENDED CAB 8' BOX 3/4 TON, EXTENDED CREW CAB 1 TON CHASSIS 161.5, REGULAR CAB 1 TON CHASSIS 137.0, REGULAR CAB 1 TON CHASSIS 161.5, REGULAR CAB 8' BOX 1 TON, REGULAR CAB 8' BOX 3/4 TON | 8 Cyl 6.6L Diesel
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GMC Sierra Pump Assembly, A/Trns Aux Fluid
Part Number: 24290230
$175.13 MSRP: $275.15
You Save: $100.02 (37%)
Ships in 1-3 Business Days
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Product Specifications
- Replaced by: 24048561
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2019-2021 GMC Sierra | CREW CAB 5'8" 1/2 TON, CREW CAB 5'8" BOX 1/2 TON, CREW CAB 6'6" BOX 1/2 TON, EXTENDED CAB 6'6" BOX 1/2 TON, EXTENDED CAB 8' BOX 1/2 TON | 6 Cyl 3.0L Diesel, 8 Cyl 5.3L, 8 Cyl 6.2L
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GMC Sierra Pump Assembly, Oil
Part Number: 98091552
$227.87 MSRP: $360.16
You Save: $132.29 (37%)
Product Specifications
- Other Name: PUMP, Engine Oil Pump; Oil Pump
- Replaces: 98044109
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007-2010 GMC Sierra | CREW CAB 1 TON, CREW CAB 6'6" BOX 3/4 TON, CREW CAB 8' BOX 3/4 TON, EXTENDED CAB 1 TON, EXTENDED CAB 6'6" BOX 3/4 TON, EXTENDED CAB 8' BOX 3/4 TON, EXTENDED CAB CHASSIS 1 TON 161.5, REGULAR CAB 1 TON, REGULAR CAB 3/4 TON, REGULAR CAB CHASSIS 1 TON 137.0, REGULAR CAB CHASSIS 1 TON 161.5 | 8 Cyl 6.6L Diesel
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GMC Sierra Pump Asm,Oil
Part Number: 98470107
Product Specifications
- Other Name: Oil Pump
- Replaces: 98025500, 97188652, 97328876, 98432188
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2001-2007 GMC Sierra | 2500 CREW CAB LONG BOX, 2500 CREW CAB STANDARD BOX, 2500 EXTENDED CAB LONG BOX, 2500 EXTENDED CAB STANDARD BOX, 2500 REGULAR CAB, 3500 CHASSIS EXTENDED CAB 161.5, 3500 CHASSIS EXTENDED CAB 185.5, 3500 CHASSIS REGULAR CAB 137.0, 3500 CHASSIS REGULAR CAB 161.5, 3500 CREW CAB, 3500 EXTENDED CAB, 3500 REGULAR CAB, CLASSIC 2500 CREW CAB LONG BOX, CLASSIC 2500 CREW CAB STANDARD BOX, CLASSIC 2500 EXTENDED CAB LONG BOX, CLASSIC 2500 EXTENDED CAB STANDARD BOX, CLASSIC 2500 REGULAR CAB, CLASSIC 3500 CHASSIS EXTENDED CAB 161.5, CLASSIC 3500 CHASSIS REGULAR CAB 137.0, CLASSIC 3500 CHASSIS REGULAR CAB 161.5, CLASSIC 3500 CREW CAB, CLASSIC 3500 EXTENDED CAB, CLASSIC 3500 REGULAR CAB | 8 Cyl 6.6L Diesel
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GMC Sierra Pump Assembly, Oil
Part Number: 12710304
$141.99 MSRP: $224.42
You Save: $82.43 (37%)
Product Specifications
- Other Name: Oil Pump
- Replaces: 12612289
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007-2013 GMC Sierra | CREW CAB 1/2 TON, EXTENDED CAB 5'8" BOX 1/2 TON, EXTENDED CAB 6'6" BOX 1/2 TON, EXTENDED CAB 8' BOX 1/2 TON, REGULAR CAB 6'6" BOX 1/2 TON, REGULAR CAB 8' BOX 1/2 TON | 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L, 8 Cyl 6.2L, 8 Cyl 6.2L Flex
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GMC Sierra Pump Asm,Oil (W/ Screen)
Part Number: 19210598
Product Specifications
- Other Name: PUMP, Engine Oil Pump; Oil Pump
- Replaces: 12562025
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2001-2007 GMC Sierra | 2500 CREW CAB LONG BOX, 2500 CREW CAB STANDARD BOX, 2500 EXTENDED CAB LONG BOX, 2500 EXTENDED CAB STANDARD BOX, 2500 REGULAR CAB, 3500 CHASSIS EXTENDED CAB 161.5, 3500 CHASSIS EXTENDED CAB 185.5, 3500 CHASSIS REGULAR CAB 137.0, 3500 CHASSIS REGULAR CAB 161.5, 3500 CREW CAB, 3500 EXTENDED CAB, 3500 REGULAR CAB, CLASSIC 2500 CREW CAB LONG BOX, CLASSIC 2500 CREW CAB STANDARD BOX, CLASSIC 2500 EXTENDED CAB LONG BOX, CLASSIC 2500 EXTENDED CAB STANDARD BOX, CLASSIC 2500 REGULAR CAB, CLASSIC 3500 CHASSIS EXTENDED CAB 161.5, CLASSIC 3500 CHASSIS REGULAR CAB 137.0, CLASSIC 3500 CHASSIS REGULAR CAB 161.5, CLASSIC 3500 CREW CAB, CLASSIC 3500 EXTENDED CAB, CLASSIC 3500 REGULAR CAB | 8 Cyl 8.1L

GMC Sierra Oil Pump Parts Questions & Experts Answers

Pump Assembly, Oil
12710303
Q: How to remove and install an oil pump on V8 engine for Chevrolet Avalanche,Silverado,Suburban,Tahoe,GMC Sierra,Yukon,Yukon Denali,Yukon XL?
A: Remove the timing chain cover and Oil Pan. Remove the oil pump pick-up tube mounting nuts and bolts and lower the pick-up tube and screen assembly from the vehicle. Remove the oil pump retaining bolts and slide the pump off the end of the crankshaft. Remove the oil pump cover and withdraw the rotors from the pump body. Clean the components with solvent, dry them thoroughly, and inspect for any obvious damage. Also, check the bolt holes for damaged threads and the splined surfaces on the crank-shaft sprocket for any apparent damage. If any of the components are scored, scratched, or worn, replace the entire oil pump assembly. There are no serviceable parts currently available. Prime the pump by pouring clean engine oil into the pick-up tube hole, while turning the pump by hand. Position the oil pump over the end of the crankshaft and align the teeth on the crankshaft sprocket with the teeth on the oil pump drive gear. Making sure the pump is fully seated against the block. Install the oil pump mounting bolts and tighten them to the proper torque specifications. Install a new O-ring on the oil pump pick-up tube, then fasten it to the oil pump and the engine block main studs. Install and align the timing chain cover, then install the oil pan. The remainder of installation is the reverse of removal. Add oil and coolant as necessary. Run the engine and check for oil and coolant leaks. Also, check the oil pressure.
Pump,Oil
93442037
Q: How to remove and install an oil pump on 4.3L V6 engine for Chevrolet Avalanche,Silverado,Suburban,Tahoe,GMC Sierra,Yukon,Yukon Denali and Yukon XL?
A: Remove the Oil Pan. While supporting the oil pump, remove the pump-to-rear main bearing cap bolt. Lower the pump and remove it along with the pump driveshaft. If a new oil pump is installed, make sure the pump driveshaft is mated with the shaft inside the pump and a new driveshaft retainer is used. Position the pump over the dowel pins on the rear main cap and make sure the slot in the upper end of the driveshaft is aligned with the tang on the lower end of the oil pump driveshaft. The oil pump driveshaft drives the oil pump, so it is absolutely essential that the components mate properly. Also, note that no gasket is used between the oil pump and the rear main cap. Install the mounting bolt and tighten it to the torque specifications. Install the oil pan and refill the engine with fresh oil. The remainder of assembly is the reverse of the disassembly procedures.