Leon Mk1
| Cylinder drive: Assembly overview (engine code BYT) |
| 1 - | Outlet valve |
| q | Valve dimensions → Fig. |
| q | Checking valve guides → Chapter |
| 2 - | Cylinder head |
| 3 - | Valve guide |
| q | check → Chapter |
| 4 - | Valve stem seal |
| q | Replace: With cylinder head installed → Chapter, with cylinder head removed → Chapter |
| 5 - | Valve spring |
| 6 - | Valve plate spring |
| 7 - | Woodruff keys |
| 8 - | Hydraulic valve clearance compensator |
| q | Do not exchange position |
| q | Lubricate contact surface |
| 9 - | Exhaust camshaft |
| q | Check radial play with a Plastigage thread (with roller rocker arms removed) |
| q | Radial play on Ø 24 mm bearings: from 0.024 to 0.066 mm |
| q | Runout: max. 0.04 mm |
| 10 - | Cylinder head cover: |
| q | With integrated camshaft bearings |
| q | Clean the sealing surface; it must not be rectified |
| q | Remove old sealant residues |
| 11 - | Bolt. |
| q | Replace |
| q | Tightening sequence → Fig. |
| 12 - | O ring |
| q | Replace |
| q | Lubricate with engine oil |
| 13 - | Plug |
| 14 - | Supply camshaft |
| q | Check radial play with a Plastigage thread (with roller rocker arms removed) |
| q | Radial play on Ø 24 mm bearings: from 0.024 to 0.066 mm |
| q | Runout: max. 0.04 mm |
| 15 - | Plug |
| q | Replace |
| q | Removing: sealing cap with cylinder head cover installed: pierce on one side of the cover with a punch and pry out |
| q | Driving in → Anchor |
| 16 - | Inlet valve |
| q | Valve dimensions → Fig. |
| q | Checking valve guides → Chapter |
Note
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| Dim. | Inlet valve | Outlet valve | |
| Ø of "a" | mm | 33,85 ± 0,10 | 28,0 ± 0,1 |
| Ø of "b" | mm | 5,98 ± 0,01 | 5,96 ± 0,01 |
| c | mm | 104,0 ± 0,2 | 101,9 ± 0,2 |
| α | ∠° | 45 | 45 |