VVT Unit (Variable Valve Timing)
Both the intake and exhaust camshafts have adjustable opening times using the hydraulically controlled VVT units. Function and structure is similar to VVT units from five cylinder petrol engine, B5254T12. The intake camshaft VVT unit is adjusted within a range of approximately 50 crankshaft degrees. The exhaust camshaft approximately 30°. Without oil pressure, the VVT unit is locked. The clearance in the locked position is approx. 1.5 crankshaft degrees.
CAMSHAFT DATA, INTAKE
| Lift height (mm) | Opening time (duration) | Opens | Closes |
| All | 8.57° - 227° | 35.5° BTDC - 14.5° ATDC | 191.5° ATDC - 241.5° ATDC |
CAMSHAFT DATA, EXHAUST
| Lift height (mm) | Duration | Opens | Closes |
| Engine B4204T9, T10 | 8, 465 - 224° | 218° BTDC - 188° BTDC | 6° ATDC - 36° ATDC |
| Engine B4204T11, T12, T15 | 7, 865 - 215° | 209° BTDC - 179° BTDC | 6° ATDC - 36° ATDC |
Opening angles given at 1 mm valve opening. BTDC (Before Top Dead Centre), ATDC (After Top Dead Centre)
There is a friction washer with a diamond coating between the VVT unit and the camshaft. Read more about diamond washers under the heading Crank system.