SEALS, GASKETS & SEALANTS
Presentations text content in SEALS, GASKETS & SEALANTS
SEALS, GASKETS & SEALANTSSlide2
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
Keep the oil in and the dirt out Separate fluids or cavitiesWithstand different pressuresSlide4
Originally made from old felt & leather seal.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 can be:
A. The flexible material component of the seal produces the lip. In this design there is only one lip, the primary sealing lipB. 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.
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
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
Must withstand heat, cold, pressure, erosion, corrosion, moisture and oilSlide11
Gasket Materialssynthetic rubbercork-rubberembossed steel (Corrugated)paperSlide12
embossed steel (Corrugated)
Use a quality gasketUse alcohol or brake cleaner on a clean rag to wipe the oil off of the machined surfaceThe surface must be dryApply a gasket sealing liquid if recommendedTighten in stepsUse the proper torque pattern when tighteningTorque to proper specsSlide15
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
Normally a graphite impregnated woven ropeSlide17
O-rings come in several sizes the most common standard sizes are 1/16, 3/32, 1/8, 3/16, 1/4Slide21
O-Rings come in several shapesO being the most common D shape, Square-ring Modified XChallenger disaster
O-Rings also come in different types of material to ensure compatibility with the fluid being contained
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
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 gapSlide28
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 largerAble to Remove with hand toolsPrevents parts from loosening from vibrationProtects threads from corrosionRecommend for valve cover bolts, rocker arm nuts, carburetor studs, motorcycle, jet skis snowmobiles etc.Applied BEFORE AssemblySlide30
Red Thread lockers
High strength requires heat to removeWorks well for studs and press fitLocks against heavy vibrationRequires extra effort to remove or special tools like heat. Without heat part may shear before thread locker releasesApplied BEFORE AssemblySlide31Slide32Slide33Slide34Slide35Slide36Slide37