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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSOLDSMOBILE1998ACHIEVA 3.1 M, 4T40E/MN4REPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSAUTOMATIC TRANSAXLE OVERHAUL & TESTING - 4T60-ECOMPONENT DISASSEMBLY & REASSEMBLYOIL PUMP ASSEMBLYCLEANING & INSPECTION
1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4
Cleaning & Inspection
1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4SECTION Cleaning & Inspection
- Inspect pump body for porosity, interconnected oil passages, or damaged inner pump area surface or machine facing. Check slide, springs, rotor and vanes for damage. Inspect slide seal, slide support and seals for damage. See Figure .
- Measure undamaged area of rotor, vane or slide to check for proper size. See OIL PUMP COMPONENT THICKNESS table. See Figure . En sure replacement parts are matched to fit within specification.
NOTE:
Oil pump components are matched sets. DO NOT mix old and new parts.
OIL PUMP COMPONENT THICKNESS
| Component | In. (mm) |
|---|---|
| Pump Rotor | .7068-.7072 (17.953-17.963), .7072-.7076 (17.963-17.973), .7076-.7080 (17.973-17.983) |
| Pump Slide | .7080-.7084 (17.983-17.993), .7084-.7088 (17.993-18.003), .7088-.7092 (18.003-18.013) |
| Pump Vane | .7064-.7071 (17.943-17.960), .7071-.7078 (17.960-17.978), .7078-.7085 (17.978-17.996) |
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.