Gaskets

Anglo Agriparts offer a full range of gaskets for Diesel engines, for John Deere, Massey Ferguson, Ford New Holland, Case International Harvester, David Brown, Ferguson and Fordson tractors. Gaskets can be classified in many different ways, for example: by material, by function, or by application. A gasket is basically a part cut from a (usually) flexible material, which sits in between two other surfaces.One of the main functions of a gasket is to seal against the leak or ingress of liquids

Our normal range includes:

Full Overhaul Gasket Set

Which will contain all the gaskets and seals necessary to completely overhaul the engine both at top and bottom end.

Cylinder Head Gasket Set

Which will normally contain Cylinder Head Gasket together with the Rocker Cover Gasket, Manifold gaskets, Valve stem seals and other ancilliary gaskets used at the top end of the engine notably water pump mounting gasket and thermostat gaskets.

Bottom Gasket Set

Which will normally contain the Sump Pan Gasket and other anciliary gaskets associated with the bottom engine rebuild, traditionally this will include the Front and Rear Crankshaft seals.

Depending on engine specification, Anglo Agriparts will also supply individual gaskets such as Cylinder Head Gasket, Rocker Cover Gasket, Manifold Gaskets, Sump Gasket, Crank Seals and Valve stem seals.

Cylinder Head Gasket - Technical Aspects

Cylinder Head Gaskets form the most critical seal on an engine, the head gasket must seal combustion pressures up to 2700 psi in turbocharged diesel engines. In addition, the Cylinder Head Gasket must withstand combustion temperatures that are in excess of 2000 deg F (1100 deg C).

The head gasket must also seal coolant and hot thin oil flowing under pressure between the cylinder head and block. Modern coolant formulas, oil detergents and additives tend to cling to water/oil ways surfaces and soak into gaskets, so gasket materials must be chosen carefully to resist these fluids and maintain an effective seal. Many head gasket coolant holes also meter the coolant flow to ensure proper circulation and cooling.

One factor is engine vibration and the head shifting and flexing as a result of the combustion pressures. Another factor is that Head gaskets must resist crushing from cylinder bolt clamping forces of 200,000 lbs (90,800 kg) that may be unevenly distributed across the head. Cylinder head gasket designs have changed over time, and in recent years with the need to meet new Emissions requirements they are changing ever faster. New engine designs and updates of older engines require advanced materials and constructions. There are two things you should remember, first of all you need to ensure that the gasket is manufactured by a high quality producer, one you can trust to assure that the engine will be sealed satisfactorily for a long time. However there is no one best gasket design since no single type is best for all applications. Exhaustive testing is performed to ensure the correct construction and design is used. No-retorque head gaskets are now common, however many gaskets for import vehicles as well as older designs require the cylinder head to be retorqued. Retorque-type gaskets set after initial engine operation and relax to the point where retorquing is needed to restore proper clamping force.

Modern Head Gaskets

Modern No-retorque Head Gasket

These gaskets use a variety of materials and basically consists of facings, coatings and a core. Cores can be either solid or clinched steel. Even if the core is a clinched steel type, the facing attached to it is dense enough to maintain torque and strong enough to resist blowout. Two facing materials used are expanded graphite and reinforced rubber fibre, these materials are dense enough not to relax too much, so retorquing is not required, buy they will compress enough to conform to minor surface irregularities of the cylinder head and block mating surfaces.

Coatings are added as needed to further help sealing. They are typically Teflon or Silicon and selection is based on the operating temperature of the engine. These anti-friction coatings also act as anti-sticking agents so the gaskets will come off cleanly protecting the engine surfaces when servicing is required.

Sealing Beads also are used to augment clamping loads on critical sealing openings such as coolant and oil ports. Wire Ring Combustion Seals may be encased in stainless steel armors for increased strength in heavy duty applications, the rings can be manufactured out of copper of pre-flattened steel.