Chevrolet Silverado / GMC Sierra. Manual — part 1900

Sealing surfaces should be clean and free of debris or oil.

Specific components such as crankshaft oil seals or valve stem oil seals may require
lubrication during assembly.

Components requiring lubrication will be identified in the service procedure.

When applying sealant to a component, apply the amount specified in the service procedure.

Tighten bolts to specifications. Do not overtighten.

USE OF ROOM TEMPERATURE VULCANIZING (RTV) AND ANAEROBIC SEALANT

Pipe Joint Compound

Pipe joint compound is a pliable sealer that does not completely harden. This type of sealer
is used where 2 non-rigid parts, such as the oil pan and the engine block, are assembled
together.

Do not use pipe joint compound in areas where extreme temperatures are expected. These
areas include the exhaust manifold, head gasket, or other surfaces where gasket eliminator is
specified.

Follow all safety recommendations and directions that are on the container.

To remove the sealant or the gasket material, refer to Replacing Engine Gaskets.

Apply the pipe joint compound to a clean surface. Use a bead size or quantity as specified in
the procedure. Run the bead to the inside of any bolt holes.

Apply a continuous bead of pipe joint compound to one sealing surface. Sealing surfaces to
be resealed must be clean and dry.

Tighten the bolts to specifications. Do not overtighten.

RTV Sealer

IMPORTANT: 3 types of sealer are commonly used in engines. These are room

temperature vulcanizing (RTV) sealer, anaerobic gasket
eliminator sealer, and pipe joint compound. The correct sealer
and amount must be used in the proper location to prevent oil
leaks. DO NOT interchange the 3 types of sealers. Use only the
specific sealer or the equivalent as recommended in the service
procedure.

NOTE:

Refer to Sealant Notice .

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

RTV sealant hardens when exposed to air. This type of sealer is used where 2 non-rigid
parts, such as the intake manifold and the engine block, are assembled together.

Do not use RTV sealant in areas where extreme temperatures are expected. These areas
include the exhaust manifold, head gasket, or other surfaces where a gasket eliminator is
specified.

Follow all safety recommendations and directions that are on the container.

To remove the sealant or the gasket material, refer to Replacing Engine Gaskets.

Apply RTV sealant to a clean surface. Use a bead size as specified in the procedure. Run the
bead to the inside of any bolt holes.

Assemble components while the RTV sealant is still wet, within 3 minutes. Do not wait for
the RTV sealant to skin over.

Tighten bolts to specifications. Do not overtighten.

Anaerobic Sealer

Anaerobic gasket eliminator hardens in the absence of air. This type of sealer is used where
2 rigid parts, such as castings, are assembled together. When two rigid parts are
disassembled and no sealer or gasket is readily noticeable, the parts were probably
assembled using a gasket eliminator.

Follow all safety recommendations and directions that are on the container.

To remove the sealant or the gasket material, refer to Replacing Engine Gaskets.

Apply a continuous bead of gasket eliminator to 1 flange. Surfaces to be sealed must be
clean and dry.

Spread the sealer evenly with your finger to get a uniform coating on the sealing surface.

Tighten bolts to specifications. Do not overtighten.

NOTE:

Refer to Sealant Notice .

NOTE:

Refer to Sealant Notice .

IMPORTANT: Anaerobic sealed joints that are partially torqued and

allowed to cure more than 5 minutes may result in incorrect
shimming and sealing of the joint.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

After properly tightening the fasteners, remove the excess sealer from the outside of the
joint.

TOOLS AND EQUIPMENT

Special tools are listed and illustrated throughout this section, with a complete listing at the end
of the section. These tools, or their equivalents, are specially designed to quickly and safely
accomplish the operations for which they are intended. The use of these special tools also
minimize possible damage to engine components. Some precision measuring tools are required
for inspection of certain critical components. Torque wrenches and a torque angle meter are
necessary for the proper tightening of various fasteners.

To properly service the engine assembly, the following items should be readily available:

Approved eye protection and safety gloves

A clean, well lit, work area

A suitable parts cleaning tank

A compressed air supply

Trays or storage containers to keep parts and fasteners organized

An adequate set of hand tools

Approved engine repair stand

An approved engine lifting device that will adequately support the weight of the
components

SPECIAL TOOLS AND EQUIPMENT

SPECIAL TOOLS

Illustration

Tool Number/Description

EN-46330

Timing Belt Tensioner Retaining Pin

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

EN-46999

Active Fuel Management Tester

EN-46999-1

Active Fuel Management Tester Air Adapter

EN-46999-5

Active Fuel Management Tester Harness -

Small Block V8

EN-47971

Oil Pressure Gage Adapter

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado