Spark Plug Boots - Damage Precautions

91chevy10

Number: 91-261-6D

Section: 6D

Date: MARCH 1991

Corp. Bulletin No.: 13603R


Subject:
SPARK PLUG BOOTS MAY BE DAMAGED BY MISHANDLING


Model and Year:
1991 LUMINA WITH 3.4L (Z-34 ONLY) ENGINE

Figure 4:

The spark plug boots on the 1991 W Car with the 3.4L (VIN Code X) engine (see Figure 4, page 6D4-6 of the Service Manual) use a "T" handle design. They are designed to reach into the head, and to be easily removed without tools. Because of tolerance stack-up conditions, the boot may be lower in the head than it should be, making it difficult to remove. The boot is made of plastic, which may break if pried with a screwdriver.

DO NOT pry on one side of the "T" with a screwdriver to remove it. The boot can usually be removed by hand by twisting to loosen it, then pulling out. If the "T" is too low to allow a good grip, pliers may be used if handled carefully, or use TWO screwdrivers to apply pressure to both sides of the "T" handle at the same time.

In addition, care should be used when installing the boot, to avoid tearing it. Make sure that the boot is correctly located over the spark plug end before applying pressure to seat the boot.


2. Spark plugs from engine.

Install or Connect

1. Spark plugs to engine.

Tighten

^ Spark plugs to 27 N-m (20 lb.ft.)

2. Plug wires to spark plugs.

^ To proper location using reference from removal.


3.4L Engine

Figure 4

Remove or Disconnect

1. Negative battery cable.
2. Plug wires from spark plugs.

^ Note position of wires before removing.


Important

^ Do not remove spark plugs when engine is hot.
^ Clean dirt and debris from spark plug recess area.

3. Spark plug(s) from engine.

Use spark plug socket with rubber insert to hold spark plug.

Install or Connect

1. Spark plug to engine.

Tighten

^ Spark plug(s) to 24 N-m (18 lb.ft.).

2. Spark plug wires.

^ To proper location as removed.

3. Negative battery cable.