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Valve system B204/B235

Valve system B204/B235


1. Exhaust valve B204i/E


2. Exhaust valve B205R/L, B235R


3. Inlet valve B204i/E


4. Inlet valve B205R/L, B235R



Important

Exhaust valves are Stellite-coated and should therefore not be machined. Only grinding with paste is recommended. The valves in the B235R are coated with a material that withstands high temperatures.


Valve guides

Length

mm

42.5

Outside diameter

mm

12.039 - 12.050

Bore for valve guides, diameter

mm

12.000 - 12.018

Maximum clearance, valve guide

mm

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



Valve springs


Length

B204

B235R/B205L/R

Fitted

mm

37.0

37.5

Free

mm

44.0 - 47.0

57.1 - 60.1

When loaded 620 - 670 N

(138 - 150 lbf)

mm

28.4

When loaded 361 -403 N

(81 - 91 lbf). Dual spring including valve disc and valve stem seal. (B235R, B205L/R only)

mm



31.7



Tappets B204/B235

Diameter

mm

32.959 - 32.975

Height

mm

24.0

Bore for tappets, diameter

mm

33.000 - 33.016