SEALS, GASKETS & SEALANTS PowerPoint Presentation

SEALS, GASKETS & SEALANTS PowerPoint Presentation

2018-10-25 10K 10 0 0

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WHAT CAUSES LEAKS. Causes of leakage. Worn or damaged seals. Worn or damaged gaskets. Worn or bent parts or shafts. Fasteners over tighten or too loose. Wrong parts or gaskets. Nicks or burrs. Improper installation. ID: 696983

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Slide1

SEALS, GASKETS & SEALANTS

Slide2

WHAT CAUSES LEAKS

Causes of leakage

Worn or damaged seals

Worn or damaged gaskets

Worn or bent parts or shafts

Fasteners over tighten or too loose

Wrong parts or gaskets

Nicks or burrs

Improper installation

Slide3

SEALS

Purpose:

Keep the oil in and the dirt out

Separate fluids or cavities

Withstand different pressures

Slide4

SEALS

Originally made from old felt & leather seal.

Most seals are made of Nitrile.

Special Seals are made of Viton, Silicone,

Polyacrylics

or chemical resistant materials.

Slide5

SEALS

Seals can be:

Spring-loaded

Spring-less

Single-lip

Multi-lip

Slide6

SEALS

Slide7

SEALS

A. The

flexible material component of the seal

produces

the lip. In this design there is only one lip, the primary sealing

lip

B. The outer shell of the seal holds the seal in place.C. The garter spring (found in most seal designs) is a coiled wire spring that provides a controlled radial load over time.

Slide8

Inspect the shaft that the seal rides

on; it

might be bent or damaged.

SEAL INSTALLATION

Slide9

SEAL INSTALLATION

Install with lip (and garter spring) toward liquid.

Lubricate lip before installation.

Use sealant on the outside of steel seals.

Use a seal installer.

Slide10

GASKET

A pliable material that is shaped and placed between two mating machined parts to form a seal.

Purpose of a Gasket

To confine; gas, oil, water, vacuum or exhaust

Seal out foreign objects such as dirt

& waterMust withstand heat, cold, pressure, erosion, corrosion, moisture and oil

Slide11

GASKET MATERIALS

Gasket Materials

synthetic rubber

cork-rubber

embossed steel (Corrugated)

paper

Slide12

GASKET MATERIALS

cork-rubber

synthetic rubber

Slide13

embossed steel (Corrugated)

paper

GASKET MATERIALS

Slide14

GASKET INSTALLATION

Use a quality gasket

Use alcohol or brake cleaner on a clean rag to wipe the oil off of the machined surface

The surface must be dry

Apply a gasket sealing liquid if recommended

Tighten in steps

Use the proper torque pattern when tighteningTorque to proper specs

Slide15

Stuffing Box

An assembly which is used to house a gland seal.

It is used to prevent leakage of fluid, such as water or steam, between sliding or turning parts of machine elements.

Slide16

Stuffing Box

GASKET MATERIAL

Normally a graphite impregnated woven rope

Slide17

Stuffing Box

Slide18

Stuffing Box

Slide19

Stuffing Box

Slide20

O-Rings

O-rings come in several sizes the most common standard sizes are 1/16, 3/32, 1/8, 3/16, 1/4

Slide21

O-Rings come in several shapes

O being the most common

D shape,

Square-ring

Modified X

Challenger

disasterO-Rings

Slide22

O-Rings also come in different types of material to ensure compatibility with the fluid being contained

O-Rings

Slide23

Slide24

Slide25

Slide26

USING SEALANTS

Use proper sealant for application.

Do not use a sealant unless specified in service manual or by gasket manufacturer.

Types of sealants

Hard drying like 3M Weather-stripping or a glue to keep a gasket in place

Aerobic (RTV) cures when exposed to air

Anaerobic cure after the components are put together (Thread lockers)

Slide27

Aerobic (RTV)

RTV - Room Temperature Vulcanizing

Called Silicone Sealant

Replaces most gaskets

Forms a rubber seal by absorbing moisture in the air

Sets in about ten minutes. Dries in about 2 hours fully cures in 24 hours.

Cure times will vary with Temperature, Humidity, and size of the gap

Slide28

Aerobic (RTV)

Blue

is the most common color but also comes in Black,

gray

,

bronze

,clear, red and white(white is for the bathroom)

Slide29

Blue Thread lockers

Medium Strength for all bolts ¼ or larger

Able to Remove with hand tools

Prevents parts from loosening from vibration

Protects threads from corrosion

Recommend for valve cover bolts, rocker arm nuts, carburetor studs, motorcycle, jet skis snowmobiles etc

.Applied BEFORE Assembly

Slide30

Red Thread lockers

High strength requires heat to remove

Works well for studs and press fit

Locks against heavy vibration

Requires extra effort to remove or special tools like heat. Without heat part may shear

before thread

locker releasesApplied BEFORE Assembly


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