Lucas/CAV throttle shaft seals – DPA, DPC and DPS pumps

£3.90£5.80

Viton and Nitrile seals have several very crucial differences that make them especially well suited to certain applications. While both Viton and Nitrile seals both serve as great sealing options at moderate temperatures, Viton is far superior to Nitrile for high temperature applications. Viton seals provide an indefinite seal for temperatures up to 200°C, and for temperatures up to 300°C they offer an excellent seal for more than 48 hours. Nitrile on the other hand is only effective up to 120°C. However, Nitrile seals provide a low temperature sealing option with effective sealing down to temperatures of –30°C, while temperatures below -15°C render Viton seals ineffective as they become quite hard and inflexible.

Along with temperature, other environmental conditions differentiate these two seals. An exceptionally broad range of chemical resistances make Viton seals a perfect option for most applications involving oils, fuels, and mineral acids, and these seals also boast excellent resistances to oxidation, ozone, UV exposure, weather, fungus, and mold. While also boasting some chemical resistances, Nitrile is much less universally resistant than its Viton counterpart suffering degradation from weather and ozone exposure. For most circumstances, however, this is not an issue, and Nitrile seals also offer the benefit of superior abrasion and tear resistance making them more suitable for more heavy duty industrial applications.

Both of these sealing options offer an extensive list of diverse applications, and they both serve as excellent general purpose seals. Nevertheless, to optimize your choice in seals be sure to consider the advantages and disadvantages of these two exceptional seals.

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Description

Throttle spindle shaft seals for Lucas/CAV diesel pumps. Fits DPA, DPC and DPS pumps. These also fit the fuel shut-off shaft on DPA and DPC pumps (sold in pairs)

These O rings often perish and wear with age, symptoms of seal failure include poor starting (often requiring hand priming – particularly in cold weather), a reduction in fuel economy, visible diesel leakage around the throttle shaft. Fortunately, they can be replaced without removing the pump from the engine. We can supply both NBR and Viton O rings

If you require the throttle shaft itself, or the top gasket, these are also available separately and as a kit.

 

Additional information

Seal Material

Nitile Buna (NBR), Viton