Disclaimer: Improperly performing this repair can severely damage your engine. I am not responsible for any damage caused by attempting this repair.
Steps (General Outline – Consult a Repair Manual for Specifics):
1. Preparation:
* Safety First: Disconnect the negative battery terminal. Use safety glasses and gloves. Work in a well-ventilated area.
* Gather Tools & Parts: You'll need a complete set of metric sockets, wrenches, screwdrivers, a torque wrench (essential!), gasket sealant, new head bolts (or studs), a new head gasket, possibly new valve cover gaskets, and possibly other related seals and gaskets. A shop manual will detail what you need.
* Drain Coolant and Oil: Completely drain the engine's coolant and oil.
* Disconnect Components: Disconnect various components attached to the engine and cylinder head, including:
* Wiring harnesses
* Fuel lines (carefully!)
* Vacuum lines
* Sensors
* Exhaust manifolds
* Intake manifold (often a significant task)
* Accessory belts and pulleys
* Remove the Cylinder Head: This involves removing the valve cover, rocker arms, and potentially other components. You'll likely need to remove the intake manifold as well. Be organized and keep track of everything you remove, using labeled containers or bags. Pay close attention to the sequence of parts removal.
2. Inspect and Prepare the Cylinder Head and Engine Block:
* Clean thoroughly: Clean the cylinder head and engine block surfaces where the gasket sits. Any debris will prevent a proper seal. Use a scraper and degreaser.
* Inspect for damage: Check the cylinder head and block for cracks or warping. Warped surfaces require machining.
* Check head bolts/studs: Replace head bolts; reuse is generally not recommended.
3. Install the New Head Gasket:
* Apply sealant (if required): Follow the instructions on the head gasket and sealant. Too much sealant is as bad as too little.
* Install the head gasket carefully: Ensure it's properly seated.
4. Install the Cylinder Head:
* Carefully align the head: Pay close attention to dowel pins and ensure the head is seated correctly.
* Tighten head bolts/studs in the correct sequence and to the correct torque specification: This is crucial. Use a torque wrench and follow the specifications in your repair manual precisely. Typically, this involves multiple tightening stages.
5. Reassembly:
* Reinstall all components: Carefully reinstall all components removed earlier, paying close attention to the correct placement and connections.
* Refill fluids: Refill the engine with the correct type and amount of coolant and oil.
6. Testing:
* Check for leaks: After reassembly, run the engine and carefully check for leaks around the head gasket and other components.
* Pressure Test (optional): A pressure test can confirm the integrity of the head gasket.
Resources:
* Haynes Repair Manual: Find a Haynes repair manual specifically for your 1995 Chevy Blazer. This is your most valuable resource.
* Chilton Repair Manual: Similar to Haynes, Chilton manuals offer detailed instructions.
* Online Forums: Search online forums (e.g., Blazer forums) for advice and troubleshooting. However, always double-check information against your repair manual.
Again, this is a simplified overview. A complete head gasket replacement is a very complex job and requires detailed instructions and expertise. If you lack experience, strongly consider professional help to avoid costly mistakes.
