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Welcome to. AfterSales Training. R355. Variable Valve Control Steve Baker. Comfort & Convenience. Coffee Breaks Lunch Arrangements Telephones Messages Start & Finish Times Toilets Smoking Policy Fire Precautions. Introduction. Course Code : R355

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  1. Welcome to AfterSalesTraining

  2. R355 Variable Valve Control Steve Baker

  3. Comfort & Convenience • Coffee Breaks • Lunch Arrangements • Telephones • Messages • Start & Finish Times • Toilets • Smoking Policy • Fire Precautions

  4. Introduction • Course Code : R355 • Course Title : Variable Valve Control • Course Duration : 1 Day

  5. Course Aim : - Introduction To Ensure All Delegates Are Familiar With the Operation & Diagnostics Associated With Variable Valve Control

  6. Course Objective : - At the End of This Course With the Aid of Support Material, the Delegates Will Be Familiar With the Operation, Location & Functionality of Variable Valve Control and Be Able to Diagnose Faults Using the Latest Diagnostic Equipment.

  7. Introduction Course Content : • Variable Valve Control Repair Procedures • Overview of MEMS3 in Relation to Variable Valve Control • Exercises in Fault Diagnosis • Fault Code Retrieval • A Detailed Insight Into All Variable Valve Control Components, Their Function & Location.

  8. Variable Valve Timing (VVC) • Code Name HAWK • Introduced in 1995 • Power Increase of 20% Over Standard 1.8

  9. Variable Valve Timing (VVC) • Max Power 147 Ps @ 7000 Rpm • Max Torque 174 Nm @ 4500 Rpm 2000 • Max Power 160 Ps @ 6900 Rpm • Max Torque 174 Nm @ 4500 Rpm

  10. Current MG ZR 160 MG TF 160 Heritage Rover 200 VI Rover 25 GTI MGF VVC MGF Trophy 160 Availability

  11. Engine Management Systems • Up to Year 2000 MEMS 2J • Year 2000 on MEMS 3

  12. Why Variable Valve Timing? • Open The Inlet Valves For Long Periods For High Speed. • Open The Inlet Valves For Short Periods For Low Speeds To Improve Bottom End Torque And Idle Stability.

  13. Inlet Opens 12° BTDC Closes 52° ABDC Exhaust Opens 52° BBDC Closes 12° ATDC Valve Open Period 244° Valve Lift 8.8 Mm - Inlet 8.8 Mm - Exhaust Valve Timing 1.8 i

  14. Inlet Opens 0°ATDC at Minimum Period Closes 40° ABDC at Minimum Period Exhaust Opens 51° BBDC Closes 21° ATDC Valve Open Period Variable Open Period Inlet 220° to 295° Valve Open Period Exhaust 252° Variable Overlap 21° to 58° Valve Lift 9.5 Mm - Inlet 9.2 Mm - Exhaust Valve Timing VVC

  15. VVC Components • VVC Housings • Housing Gasket • Timing Gear • Inlet Camshaft • Hydraulic Control Unit • Solenoid Valves • Control Rod

  16. VVC - How It Works • The Cam Lobes Are Driven Through An Eccentric Mechanism. • The Position Of The Eccentric Either Speeds Up Or Slows Down The Valves Opening Sequence.

  17. Hydraulic Tappets • Outside Diameter= 32.959 > 32.975mm. • Early Length= 26.0 mm. • Later Length= 24.5 mm. • Lightweight Construction to Reduce Valve Seat Hammer

  18. Practical Session

  19. 1.8 VVC 160ps Enhancements • MEMS 3 Recalibration • Improved Exhaust Gas Flow • Thin Wall Monolith Catalyst • Enlarged Internal Bore in Throttle Body

  20. 1.8 VVC 160ps Enhancements • Raised Compression Ratio - Revised Piston (10.6:1) • Revised Valve Seats & Valve Ports • Dual Mode Exhaust System

  21. 1.8 VVC 160ps Performance Curve

  22. Dual Mode Valve Open

  23. Dual Mode Valve Closed

  24. Dual Mode Valve Operation • Throttle Position • Engine Coolant Temperature • Vehicle Speed/Engine Speed • Distance Travelled

  25. Dual Mode Actuator

  26. Dual Mode Solenoid

  27. MEMS 3 Inputs • Crankshaft Position Sensor. • Camshaft Sensor Position. • Coolant Temperature Sensor. • Oil Temperature Sensor. • Inlet Air Temperature Sensor.

  28. MEMS 3 Inputs • Engine Bay Temp Sensor. • Throttle Position Sensor. • Map Sensor. • Upstream & Downstream O2 Sensors.

  29. MEMS 3 Outputs • VVC Solenoids • Ignition Coils • Injectors • Stepper Motor • Main Relay

  30. MEMS 3 Outputs • Engine Bay Cooling Fan Relay • Radiator Cooling Fan • O2 Sensor Heater Relay • Dual Mode Solenoid • Air Conditioning Relay

  31. Cause-Max Overlap Solenoid Valve Spool Valve HCU Sticking Wiring ECU Mechanism Engine Runs Rough At Idle. Idle Speed Raised Approx 1200 Rpm, OK At High Rpm Fault Symptoms

  32. Minimum Valve Overlap Solenoid Valve Spool Valve HCU Wiring ECU Mechanism Lack Of Performance At High Rpm, Ok At Low Rpm. Rev Limiter At Approx 5750 Rpm Fault Symptoms

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