Frequently asked questions about Diesel and Hydraulics

For your convenience, here are answers to some of the more commonly asked questions about the field of diesel mechanics.

If you have further questions, please contact us at Hydraulink. We’ll be happy to help.

Hydraulic hoses and fittings should generally be replaced every one or two years. This is not a definitive answer because it does depend on the quality of the hoses and fittings, as well as how they are used and under what circumstances. Keeping a logbook of any replacements and equipment failures will lead to a more realistic idea of the lifespan of your hydraulics hoses.

Hydraulics hoses and/or fittings will probably need to be replaced if the following signs are noted during mechanical checks:

  • Crushed Hoses
    Crushed hoses can build pressures, leading to leaks and to hoses bursting.
  • Exposed Wire
    Exposed wire is evidence of serious abrasion and should be investigated. The damaged hose will need to be replaced.
  • Kinked Hose
    Kinks often mean incorrect routing causing the hose to be bent beyond the manufacturer’s specifications. The hose should be replaced if these kinks show any signs of damage. If the kink is discovered before damage is done, it may be possible to re-route the hose and avoid sharp bends.
  • Oil Leaks
    Best to get these checked out straight away. Only the fitting may need to be replaced but if it gets worse, the whole assembly might need to be replaced.
  • Cracked Fittings
    Cracked or corroded fittings should be replaced. It would be safest to replace the hose as well, as faulty fittings can cause damage to hoses. Some white oxidation on the fittings might be OK but rust is a definite problem.
  • Diesel fuel is more economical than petrol. Diesel engines can convert more than 45% of the fuel energy into mechanical energy, while petrol engines are typically only 30% efficient.
  • A diesel engine has about twice the life expectancy of a petrol engine. Its parts are certainly built stronger.
  • Diesel engines generate less waste heat in cooling and exhaust. And the carbon monoxide content of the exhaust is minimal.
  • An incorrect balance between air and fuel will lead to smelly black exhaust fumes—usually too much fuel, not enough air. This can be caused by a faulty injector or injector pump, or problems with an air filter or EGR (Exhaust Gas Recirculation) valve or even the turbocharger.

    Difficulty starting a diesel engine is usually due to low compression or a fuel delivery issue. The wrong weight viscosity of engine oil can also cause problems with starting. Diesel lubricants have a much higher viscosity than those for petrol engines. Sometimes, a single-weight engine oil, fine during hot weather, is not appropriate for colder weather when a multi-viscosity oil is needed. It’s better to use a multi-viscosity oil all year ’round than to forget to switch and risk damaging the engine.

    If your diesel engine is extremely difficult to start, cranks more than normal, or won’t start at all, it’s time to get it checked out. Our mobile team provides a 24-hour call-out service for emergencies.

    Contact Hydraulink today for a free quote.

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    Contact the tradesmen at Hydraulink for hydraulic, auto electrical and diesel repairs and maintenance. Stop by our workshop or contact our mobile team who are on call 24/7.

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