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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



Important

The exhaust valves are stellite coated and must therefore not be machined. Grinding with paste only is advised. B235R and B205 R/L have nimonic valves manufactured of a high-temperature resistant material.


Valve guides

Length

mm

42.5

Outside diameter

mm

12.039 - 12.050

Bore for valve guides, diameter

mm

12.000 - 12.018

Max clearance, valve guide (exhaust valve)

mm

0.22 (Measured across the valve disc with the valve drawn out 3 mm from the valve seat.)



Valve springs


Length

Fitted

mm

37.5

Free

mm

57.1 - 60.1

When loaded 620 - 670 N

(138 - 150 lbf)

mm

When loaded 361 -403 N

(81 - 91 lbf). Twin coil springs incl. valve disc and valve stem seal.

mm

31.7



Tappets

Diameter

mm

32.959 - 32.975

Height

mm

24.0

Bore for tappets, diameter

mm

33.000 - 33.016