Steps (General – Consult your repair manual for specifics!):
1. Safety First: Disconnect the negative battery terminal. Support the vehicle securely on jack stands. Wear safety glasses and gloves.
2. Drain the Oil: Completely drain the engine oil.
3. Remove the Undercarriage Components: You'll likely need to remove some components obstructing access to the oil pan. This could include:
* Lower splash shields: These are often plastic and held on by clips or screws.
* Exhaust components: Some exhaust components might need to be loosened or removed to gain sufficient clearance.
* Crossmember: In some cases, parts of the crossmember might need to be loosened (but not necessarily removed entirely) – this is the most challenging aspect.
4. Disconnect Oil Pan Components:
* Oil pan gasket: Carefully separate the old gasket from the oil pan.
* Oil level sensor: Disconnect the oil level sensor wiring harness if equipped.
* Oil pressure sending unit: Disconnect the wiring harness.
5. Unbolt the Oil Pan: This is the most labor-intensive part. The oil pan is likely secured by numerous bolts. You'll need to carefully remove each bolt, working systematically. Some bolts may be difficult to reach, requiring the use of extensions, swivel sockets, or even a ratchet wrench with a flexible head.
6. Lower the Oil Pan: Once all bolts are removed, carefully lower the oil pan. It might be stuck due to gasket material or sealant. Gently work it free, being mindful not to damage the oil pan or the engine block.
7. Clean the Oil Pan and Engine Block: Thoroughly clean the mating surfaces of the oil pan and the engine block, removing all traces of old gasket material.
8. Install the New Oil Pan and Gasket: Apply a fresh bead of RTV silicone sealant to the new gasket (if using a gasket) or directly to the engine block (depending on your design). Carefully position the oil pan and bolt it back into place. Tighten the bolts in a star pattern to ensure even pressure.
9. Reconnect Components: Reinstall all the components you removed earlier (oil level sensor, oil pressure sending unit, splash shields, exhaust components etc.).
10. Refill with Oil: Refill the engine with the correct amount and type of oil.
11. Check for Leaks: Start the engine and check for any leaks around the oil pan.
Important Considerations:
* Space: You will need significant space underneath the vehicle to work comfortably.
* Tools: You'll need a variety of sockets, wrenches, screwdrivers, and possibly a ratchet with extensions and a swivel head.
* Patience: This job requires patience and a methodical approach.
* Repair Manual: A factory or Haynes repair manual specific to your 1995 Chevy Blazer is crucial. It will provide detailed instructions, torque specifications, and diagrams. Improper tightening can damage the engine.
Disclaimer: This is a general guide only. Attempting this repair without proper experience and tools could result in damage to your vehicle. If you are not comfortable performing this repair, take your Blazer to a qualified mechanic.
