Lombardini CHD series - Valve Timing Angles; Engines with mechanical tappets; Engines with hydraulic tappets

- 55 - Workshop Manual LDW CHD _ cod. 1.5302.345 - 6° ed_rev. 05
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3051WDL
3061WDL
4002WDL
4022WDL
3051WDL
3061WDL
4002WDL
4022WDL
T/4002WDL
T/4022WDL
116
Disassembly / Reassembly
Engines with mechanical tappets
Timing angles for checking puposes
(valve clearance = 2 mm)
α = 14° after S(correspondingto35mmontheywheel)
β = 6° after I (correspondingto15mmontheywheel)
γ = 17° before I (correspondingto43mmontheywheel)
δ = 15° before S(correspondingto38mmontheywheel)
Timing angles for operating purposes
(valve clearance 0.15 mm)
α = 14° before S (correspondingto35mmontheywheel)
β = 34° after I (correspondingto85mmontheywheel)
γ = 46° before I (correspondingto115mmontheywheel)
δ = 14° after S (correspondingto35mmontheywheel)
Timing angles for checking purposes LDW 2004/T
(valve clearance 2 mm)
α = 15° after S (correspondingto38mmontheywheel)
β = 21° after I(correspondingto52mmontheywheel)
γ = 31° before I (correspondingto77mmontheywheel)
δ = 13° before S(correspondingto32mmontheywheel)
Timing angles for operating purposes LDW 2004/T (valve
clearance 0.15 mm)
α = 12° before S (correspondingto30mmontheywheel)
β = 48° after I (correspondingto120mmontheywheel)
γ = 58° before I (correspondingto145mmontheywheel)
δ = 14° after S(correspondingto35mmontheywheel)
Engine typer.p.m.
Intake Exhaust
α = 8° before S
β = 28° after I
under
2400 r.p.m.
upper
2400 r.p.m.
γ = 36° before I
δ = 8° after S
α = 12° before S
β = 36° after I
γ = 48° before I
δ = 12° after S
under/upper
2400 r.p.m.
α = 12° before S
β = 48° after I
γ = 58° before I
δ = 14° after S
Engines with hydraulic tappets
Timing belt operating angles (with valve clearance set to zero)
Legend
S = piston at top dead centre
l = piston at bottom dead centre
α = intake valve open
β = intake valve closed
γ = exhaust valve open
δ = exhaust valve closed