Lesson 1Air intake path: air filter, intake manifold, and causes of restrictionThis part reviews the diesel air intake route from filter to valves, including filter materials, casings, pipes, manifolds, and swirl aids, along with frequent blockage sources, gauging techniques, and upkeep plans for Eritrean dusty roads.
Air filter media types and efficiency ratingsFilter housings, pre‑cleaners and snorkelsIntake duct routing, resonators and leaksManifold design, runners, swirl and tumbleSources of restriction, dust and ice buildupMeasuring restriction and service intervalsLesson 2High-pressure injection: common rail vs. pump‑line‑nozzle and mechanical injection pump fundamentalsThis part describes diesel high-pressure fuel creation and regulation, contrasting common rail with pump-line-nozzle setups, and explaining mechanical straight and spinning pumps, timing, pressure handling, and usual wear or breakdown patterns in Eritrea.
Common rail layout, pressure control and sensorsPump‑line‑nozzle architecture and timing effectsInline mechanical pump elements and cam profileRotary/distributor pump operation and advancePressure waves, line length and injection shapingTypical high‑pressure leakage and test methodsLesson 3Intercooler function, pressure loss, fouling and cleaning considerationsThis part explains intercooler aims and functions, comparing air-to-air and air-to-liquid types, tackling pressure drops, dirt buildup, leaks, cleaning approaches, and how intake air heat influences power and emissions in Eritrean heat.
Charge‑air cooling benefits and heat transferAir‑to‑air versus air‑to‑liquid intercoolersPressure drop, flow balance and sizingOil fouling, soot deposits and leak pathsCleaning methods, flushing and drying stepsTesting for leaks and performance lossLesson 4Ancillary components: EGR overview, PCV/ventilation basics, sensors relevant to diesel (MAP/MAF, coolant temp, oil pressure)This part surveys essential supporting diesel parts, like EGR and crankcase airing, plus key sensors including MAP, MAF, coolant heat, and oil force, and their links to the engine control unit in Eritrean diesel setups.
EGR purpose, flow control and cooler issuesPCV and crankcase ventilation arrangementsMAP sensor role, mounting and failure modesMAF sensor types, contamination and testingCoolant temperature and oil pressure sensingSensor data use in diesel ECU strategiesLesson 5Cooling system: radiator, water pump, thermostat, coolant types and causes of overheatingThis part covers diesel cooling setup and workings, from radiator, pump, thermostat, coolant makeup, flow routes, to common overheat triggers, with checks, tests, and upkeep to avoid failures in Eritrea's hot climate.
Coolant flow path and heat transfer basicsRadiator, fan, shroud and airflow managementWater pump design, drive types and failuresThermostat operation, testing and replacementCoolant types, mixing rules and corrosion controlDiagnosing overheating and hot‑spot conditionsLesson 6Injectors: nozzle types, spray patterns, wear symptoms, and leakage effectsThis part centers on diesel injector build and roles, including nozzle kinds, spray forms, opening force, wear and clog signs, leak impacts on emissions and power, and simple test and care routines for Eritrean service.
Pintle, hole‑type and multi‑hole nozzlesSpray pattern, atomization and penetrationInjector opening pressure and pop testingNozzle coking, erosion and seat wearInternal leakage, dribble and misfire effectsBasic cleaning, replacement and codingLesson 7Turbocharger components and operation: turbine, compressor, wastegate/variable geometry basicsThis part describes turbocharger structure and functions, including turbine and compressor air flows, bearing setups, wastegate and adjustable geometry controls, pressure caps, and breakdown signs tied to oiling or over-rev in Eritrea.
Turbine housing, wheel design and energy useCompressor maps, surge and choke regionsJournal and ball bearings, seals and coolingWastegate actuators, control lines and tuningVariable geometry vanes, actuators and sootTurbo failure modes, inspection and protectionLesson 8Fuel delivery system: fuel tank, lift pump, primary and secondary filters, and water separatorsThis part outlines the low-pressure fuel path, from tank and draw to lift pump, filters, and water removers, stressing dirt prevention, air entry, blockage diagnosis, and regular care in Eritrean fuel conditions.
Fuel tank design, pickups and return routingLift pump types, priming and failure signsPrimary and secondary filter functionsWater separator design and draining practiceAir leaks, suction restriction and cavitationService intervals and contamination controlLesson 9Lubrication system: oil types, oil pump, galleries, bearings and oil filter functionThis part details diesel oiling design, oil kinds and boosters, pump types, channels, bearings, and filtering, showing how oil force is made, watched, and kept to stop wear and heat in Eritrean engines.
Engine oil grades, base stocks and additivesOil pump types, drives and pressure regulationMain galleries, branch feeds and priority circuitsBearing lubrication, clearances and coolingOil filter types, bypass valves and serviceLow oil pressure diagnosis and common causes
