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How do I Install a Cylinder Head in a 1999 Jimmy

The Jimmy is a mid-size sport utility vehicle that General Motors manufactured from 1983 to 2005. The 1999 model belongs to the second generation, which was in production from 1995 to 2005. These vehicles had a six-cylinder 4.3-liter engine with sequential fuel injection. The cylinder head in a 1999 Jimmy is a platform on the cylinder block that contains the poppet valves and spark plugs. The procedure for installing a cylinder head is generally the same for all versions of the Jimmy made between 1994 and 1999.

Instructions

1

Remove the negative battery cable with a socket wrench. Remove the filler cap to relieve the pressure in the fuel tank. Wrap a shop rag around the fuel pressure connection on the fuel rail and connect a fuel pressure gauge to the connection. Place the bleed hose of the fuel pressure gauge into a container approved for gasoline, and open the valve on the fuel pressure gauge. Relieve the pressure in the fuel system and drain the excess fuel into the gasoline container.

2

Place a sealable container under the radiator drain and open the drain plug with a socket wrench. Drain the coolant into the container and seal it for reuse. Disconnect the intake manifold and exhaust manifold from the engine. Disconnect the cooling fan assembly from the radiator.

3

Detach the electrical wiring harness and coolant sensor wire from the rear of the cylinder head. Record the positions of the electrical wiring for the spark plugs and disconnect them. Unscrew the spark plugs with a socket wrench and remove the spark plugs from the cylinder head.

4

Remove the bracket for the fuel line from the cylinder head with a socket wrench. Disconnect the cover for the rocker arm and loosen the rocker arm. Remove the push rods from the cylinder block.

5

Remove the bolts from the cylinder head with a socket wrench and lift the cylinder head from the cylinder block. Remove any dirt from the threads of the cylinder head bolts with a shop cloth to ensure you can properly torque the bolts later.

6

Mount a new gasket for the cylinder head on the dowel pins so that the side of the gasket with the words "This Side Up faces up. Install the new cylinder head onto the dowels and gasket. Apply a thin layer of sealer 12346004 to the threads on the cylinder head bolts. Record the length of each bolt and fasten the mounting bolts to the cylinder head by hand.

7

Tighten the mounting bolts for the cylinder head to 22 foot-lbs. with a torque wrench. Tighten the short bolts an additional 55 degrees with a socket wrench. Tighten the medium bolts to 65 degrees and tighten the long bolts to 75 degrees.

8

Connect the push rods to the cylinder block and fasten the rocker arms with a socket wrench. Replace the cover for the rocker arms and screw the spark plugs into the cylinder block. Connect the electrical wiring for the spark plugs using the notes you made in Step 3.

9

Attach the bracket for the fuel line with a socket wrench and attach the electrical wiring to the rear of the cylinder head. Connect the electrical wire to the coolant sensor. Attach the exhaust manifold and intake manifold.

10

Fasten the cable for the negative battery terminal with a socket wrench and fill the engine with coolant. Start the engine and check for fluid leaks.