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Valve gear

Valve gear



1. Exhaust valve

2. Inlet valve

Exhaust valve

Inlet valve

A

A Nimonic

mm

mm

4.9575 ±0.0075

4.9725 ±0.0075

4.9775 ± 0.0075

B

mm

29 ± 0.1

33 ± 0.1

C

mm

107.84

107.3

D

mm

1.5 - 2.0

1.0 - 1.5

E

°

44.5 ±0.167

45.25 ± 0.25




Valve guides

Length

mm

42.5 - 43.0

Outside diameter

mm

12.039 - 12.050

Bore for valve guides, diameter

mm

12.000 - 12.018



Maximum lateral clearance between valve stem and valve guide

New engine:





Inlet valve

mm

0.17

Exhaust valve

mm

0.22





Clearance is measured at the disc with the valve pulled out 3 mm from the seat.




Valve springs (double springs)

Length,

fitted

mm

37.5



free

mm

57.1 - 60.1



Tappets

Diameter

mm

32.959 - 32.975

Height

mm

24± 0.5

Bore for tappets, diameter

mm

33.000 - 33.016