Lesson 1Air Intake Path: Air Filter, Intake Manifold, and Restriction CausesThis part looks at the diesel air intake from filter to ports, including filter materials, housings, pipes, manifolds, and swirl devices, plus common blockages, measurement ways, and maintenance tips for Ugandan dust.
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 Pump BasicsThis part explains diesel high-pressure fuel creation and control, comparing common rail and pump-line-nozzle, and detailing mechanical inline and rotary pumps, timing, pressure control, and common wear or failures in local use.
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 NeedsThis part explains intercooler purpose and working, comparing air-to-air and air-to-liquid types, addressing pressure loss, dirt buildup, leaks, cleaning methods, and how charge-air temperature affects power and emissions.
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 4Supporting Parts: EGR Overview, PCV/Ventilation Basics, Sensors for Diesel (MAP/MAF, Coolant Temp, Oil Pressure)This part reviews key supporting diesel parts, including EGR and crankcase ventilation, plus important sensors like MAP, MAF, coolant temperature and oil pressure, and how they work with the engine control unit.
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 Overheating CausesThis part covers diesel cooling system setup and working, including radiator, pump, thermostat, coolant types, flow paths, and common overheating reasons, plus checks, tests, and preventive maintenance for hot climates.
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 Signs, and Leakage EffectsThis part focuses on diesel injector build and function, covering nozzle types, spray patterns, opening pressure, wear and coking signs, leakage effects on emissions and power, and basic test and service practices.
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 Parts and Working: Turbine, Compressor, Wastegate/Variable Geometry BasicsThis part explains turbocharger build and working, covering turbine and compressor air flow, bearing systems, wastegate and variable geometry control, boost limits, and failure signs linked to lubrication or overspeed.
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 describes the low-pressure fuel delivery path, from tank and pickup to lift pump, filters and water separators, stressing contamination control, air entry, blockage diagnosis, and routine service in Uganda.
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 lubrication system design, oil grades and additives, pump types, galleries, bearings, and filtration, explaining how oil pressure is created, monitored, and kept to prevent wear and overheating.
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
