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Valve Tappets

Due to the manufacturing complexity involved in this deceptively simple-looking component, Garima Global works with only the leading manufacturers of cam followers in India to source valve tappets / valve lifters for our customers.

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Product

The purpose of the cam follower is to translate the lifting action of the cam lobe to the valve.

APPLICATIONS

Garima Global supplies components for a wide variety of on-road, off-road, industrial and stationary applications such as: automotive (light duty) and light commercial, trucks (heavy duty), tractors (agricultural), earthmoving and construction machinery, generators, irrigation pumps, and defence / special purpose vehicles.

The brands for which we manufacture and export aftermarket products are Caterpillar, Chevrolet, Chrysler, Citroen, Cummins, Daewoo, DAF, Daihatsu, Detroit Diesel, Deutz, Fiat, Ford, Hino, Honda, Hyundai, International, Isuzu, Iveco, John Deere, Kamaz, Kia, Komatsu, Kubota, Land Rover, Leyland, Lister Petter, Lombardini, Mack, Mahindra, MAN, Massey Ferguson, Mazda, Mercedes Benz, Mitsubishi, Navistar, Nissan, Onan, Perkins, Peugeot, Renault, Scania, Suzuki, Tata, Tatra, Toyota, Ursus, UTB, Volvo, Yanmar and Zetor, amongst others.

Garima Global also export parts for air-brake compressors like Wabco, Bendix, Knorr, Cummins, Clayton Dewandre, Mercedes, Midland etc.

PRODUCT CATALOG

Garima Global has developed an extensive range of components for engine, braking, transmission, suspension, steering, chassis, electrical, lighting and other automotive sub-systems. To assist our customers with choosing the right product for their requirements we have published comprehensive catalogs with engine / vehicle models, interchange with references of OEMs and other popular aftermarket brands, fitment dimensions and other technical data. We strongly encourage you to contact us with your specific requirements so that we can email you the relevant catalogs, and we look forward to starting a mutually beneficial business relationship with you soon!

TYPES OF VALVE TAPPETS

DESIGN

Depending on the shape and type of contact the tappet makes with the cam lobes, valve tappets are categorized as below.

SLIDING CONTACT TAPPETS

The head of a solid lifter is case hardened or chilled cast to resist the scuffing action of the cam lobe sliding across its surface. The surface that comes in contact with the cam lobe is given a slight convex shape to promote gradual wear and seating during initial hours of engine operation. They have the following shapes:

Bucket Tappets
Flat-base tappets
Mushroom Tappets

ROLLING CONTACT TAPPETS

In case of a roller cam follower there is a rolling contact between the camshaft and the cam follower, allowing for a much higher loading threshold. The roller itself is made of appropriate grade of steel, case hardened to resist frictional wear.

HYDRAULIC LIFTERS

Hydraulic lifters, or hydraulic lash adjusters, use a small piston that, when filled with pressurized engine oil, acts like a hydraulic spring and automatically adjusts the clearance between the lifter and the cam lobe thus eliminating the need to adjust tappet clearance manually.

MATERIAL

Tappets may be manufactured by chilled casting method or from induction hardened steel bars. Popular materials used in their manufacture are given below.

CHEMICAL COMPOSITION

ELEMENT 16MnCr5
1.7131
20MnCr5
1.7147
EN19 EN9 EN8 CHILLED GREY CAST IRON
Carbon (%) 0.14-0.19 0.17-0.22 0.35-0.45 0.50-0.60 0.36-0.44 3.30-3.60
Silicon (%) 0.40 MAX 0.15-0.40 0.10-0.35 0.10-0.35 0.10-0.40 1.30-2.40
Manganese (%) 1.00-1.30 1.10-1.40 0.50-0.80 0.50-0.80 0.60-1.00 0.60-0.80
Phosphorus (%) 0.025 MAX 0.025 MAX 0.05 MAX 0.04 MAX 0.05 MAX 0.20 MAX
Sulphur (%) 0.035 MAX 0.035 MAX 0.05 MAX 0.04 MAX 0.05 MAX 0.10 MAX
Chromium (%) 0.80-1.10 1.00-1.30 0.90-1.50 - - 0.80-1.10
Molybdenum (%) - - 0.20-0.40 - - 0.30-0.60
Nickel (%) - - - - - 0.40-0.60
Copper (%) - 0.40 MAX - - - -
Technetium (%) - - - - - -
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