Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1989R 20 P/U 2WD V8-454 7.4LREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINEOIL PUMP, ENGINEDIMENSION/CLEARANCE SPECIFICATIONS
1989 Chevrolet R 20 P/U 2WD V8-454 7.4L
Dimension/Clearance Specifications
1989 Chevrolet R 20 P/U 2WD V8-454 7.4LSECTION Dimension/Clearance Specifications
| Rotor Backlash | - Note: Pump rotors & body are not serviced separately. If inspection reveals damaged or worn components the pump assembly should be replaced. | |
| Rotor To Body Clearance | - Note: Pump rotors & body are not serviced separately. If inspection reveals damaged or worn components the pump assembly should be replaced. | |
| Rotor End Clearance Note: Measured between pump cover mating surface & end of rotors using straightedge & suitable feeler gauges. | - Note: Pump rotors & body are not serviced separately. If inspection reveals damaged or worn components the pump assembly should be replaced. | |
| Gear Pocket | Depth | - Note: Pump rotors & body are not serviced separately. If inspection reveals damaged or worn components the pump assembly should be replaced. |
| Diameter | - Note: Pump rotors & body are not serviced separately. If inspection reveals damaged or worn components the pump assembly should be replaced. | |
| Rotor Thickness | - Note: Pump rotors & body are not serviced separately. If inspection reveals damaged or worn components the pump assembly should be replaced. | |
| Rotor Diameter | - Note: Pump rotors & body are not serviced separately. If inspection reveals damaged or worn components the pump assembly should be replaced. | |
| Relief Valve To Body Clearance | - Note: Pump rotors & body are not serviced separately. If inspection reveals damaged or worn components the pump assembly should be replaced. |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.