Chevrolet Silverado / GMC Sierra. Manual

to the friction areas during assembly in order to protect and lubricate the surfaces on initial
operation. Throughout this section, practice proper cleaning and protection procedures to the
machined surfaces and to the friction areas.

Whenever you remove the valve train components, keep the components in order. Follow this
procedure in order to install the components in the same locations and with the same mating
surfaces as when removed.

Disconnect the negative battery cables before you perform any major work on the engine. For
more information on the disconnection of the battery, refer to Battery Negative Cable
Disconnection and Connection (w/Single Battery) or Battery Negative Cable
Disconnection and Connection (w/Auxiliary Battery) or Battery Negative Cable
Disconnection and Connection (w/Dual Batteries) .

SEPARATING PARTS

Separate, mark, or organize the following components:

Piston and the piston pin

Piston to the specific cylinder bore

Piston rings to the piston

Connecting rod to the crankshaft journal

Connecting rod to the bearing cap

A paint stick or etching/engraving type tool are recommended. Stamping the connecting rod
or cap near the bearing bore may affect component geometry.

NOTE:

Engine damage may result if an abrasive paper, pad, or motorized
wire brush is used to clean any engine gasket surfaces.

CAUTION: Refer to BATTERY DISCONNECT CAUTION .

IMPORTANT: Many internal engine components will develop specific wear

patterns on their friction surfaces.
When disassembling the engine, internal components MUST be
separated, marked, or organized in a way to ensure reinstallation
to their original location and position.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Crankshaft main and connecting rod bearings

Camshaft and valve lifters

Valve lifters, guides, pushrods, pivot supports and rocker arms

Valve to the valve guide

Valve spring and shim to the cylinder head location

Engine block main bearing cap location and direction

Oil pump drive and driven gears

REPLACING ENGINE GASKETS

Gasket Reuse and Applying Sealant

Do not reuse any gasket unless specified.

Gaskets that can be reused will be identified in the service procedure.

Do not apply sealant to any gasket or sealing surface unless specified in the service
procedure.

Separating Components

Use a rubber mallet in order to separate the components.

Bump the part sideways in order to loosen the components.

Bumping of the component should be done at bends or reinforced areas of the component to
prevent distortion of the components.

USE OF ROOM TEMPERATURE VULCANIZING (RTV) AND ANAEROBIC SEALANT

Sealant Types

The following 2 major types of sealant are commonly used in engines:

Aerobic sealant (Room Temperature Vulcanizing (RTV))

Anaerobic sealant, which include the following:

Gasket eliminator

IMPORTANT: The correct sealant and amount of sealant must be used in the

proper location to prevent oil leaks, coolant leaks, or the
loosening of the fasteners. DO NOT interchange the sealants. Use
only the sealant (or equivalent) as specified in the service
procedure.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Pipe

Threadlock

Aerobic Type Room Temperature Vulcanizing (RTV) Sealant

Aerobic type Room Temperature Vulcanizing (RTV) sealant cures when exposed to air. This type
of sealant is used where 2 components (such as the intake manifold and the engine block) are
assembled together.

Use the following information when using RTV sealant:

Do not use RTV sealant in areas where extreme temperatures are expected. These areas
include:

The exhaust manifold

The head gasket

Any other surfaces where a different type of sealant is specified in the service
procedure

Always follow all the safety recommendations and the directions that are on the RTV
sealant container.

Use a plastic or wood scraper in order to remove all the RTV sealant from the components.

The surfaces to be sealed must be clean and dry.

Use a RTV sealant bead size as specified in the service procedure.

Apply the RTV sealant bead to the inside of any bolt holes areas.

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

Tighten the fasteners in sequence (if specified) and to the proper torque specifications. DO
NOT overtighten the fasteners.

Anaerobic Type Gasket Eliminator Sealant

Anaerobic type gasket eliminator sealant cures in the absence of air. This type of sealant is used
where 2 rigid parts (such as castings) are assembled together. When 2 rigid parts are disassembled
and no sealant or gasket is readily noticeable, then the 2 parts were probably assembled using an

IMPORTANT: Do not allow the RTV sealant to enter any blind threaded

holes, as it may prevent the fasteners from clamping
properly or cause damage when the fastener is tightened.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

anaerobic type gasket eliminator sealant.

Use the following information when using gasket eliminator sealant:

Always follow all the safety recommendations and directions that are on the gasket
eliminator sealant container.

Apply a continuous bead of gasket eliminator sealant to one flange.

The surfaces to be sealed must be clean and dry.

Apply the gasket eliminator sealant evenly to get a uniform thickness of the gasket
eliminator sealant on the sealing surface.

Tighten the fasteners in sequence (if specified) and to the proper torque specifications. DO
NOT overtighten the fasteners.

After properly tightening the fasteners, remove the excess gasket eliminator sealant from the
outside of the joint.

Anaerobic Type Threadlock Sealant

Anaerobic type threadlock sealant cures in the absence of air. This type of sealant is used for
threadlocking and sealing of bolts, fittings, nuts, and studs. This type of sealant cures only when
confined between 2 close fitting metal surfaces.

Use the following information when using threadlock sealant:

Always follow all safety recommendations and directions that are on the threadlock sealant
container.

The threaded surfaces to be sealed must be clean and dry.

Apply the threadlock sealant as specified on the threadlock sealant container.

IMPORTANT: Do not allow the gasket eliminator sealant to enter any blind

threaded holes, as the gasket eliminator sealant may prevent
the fasteners from clamping properly, seating properly, or
cause damage when the fastener tightened.

IMPORTANT: Gasket eliminator sealed joint fasteners that are partially

torqued and the gasket eliminator sealant allowed to cure
more than five minutes, may result in incorrect shimming
and sealing of the joint.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

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Chevrolet Silverado / GMC Sierra. Manual - part 413