![background image](/i/bmw/160195/bmw-c1-2001/h/bmw-c1-2001-082.png)
11.6
Valve guide
Inlet/exhaust inside diameter
mm (in) 4.002…4.015 (0.1576…0.1581)
Wear limit
mm (in) max. 0.5 (0.0197)
Projection
mm (in) 9.8…10.2 (0.3858…0.4016)
Valve seat angle
Inlet
° 45
Exhaust
° 45
Included angle between valves
Inlet
° 16
Exhaust
° 18
Valve seat width
Inlet
mm (in) 1.185…1.215 (0.0466…0.0478)
Wear limit
mm (in) 2 (0.0787)
Inspection dimension
mm (in) 1.0…1.4 (0.0394…0.0551)
Exhaust
mm (in) 1.385…1.415 (0.0545…0.0557)
Wear limit
mm (in) 2 (0.0787)
Inspection dimension
mm (in) 1.2…1.6 (0.0472…0.0630)
Valve seat surface
mm (in)
2
0.8 (0.0315)
Wear limit
mm (in)
2
0.6 (0.0236)
Bucket tappets (wear limit)
Extl. dia.
mm (in) 25.980…25.993 (1.0228…1.0239)
Radial play in cylinder head
mm (in) 0.100 (0.0039)
Guide Ø in cylinder head
mm (in) 26.007…26.008 (1.02389…1.02393)
Wear limit
mm (in) 26.04 (1.0252)
Valve spring
When new (uncompressed)
mm (in) 36.93 (1.4539)
41.0 (1.6142)
Wear limit
mm (in) 36.7 (1.4449)
40.8 (1.6063)
Oil circuit bypass valve
Compression spring for pressure-re-
lief valve, uncompressed
mm (in) 13.5 (0.5315)
Wear limit
mm (in) 13.4 (0.5276)
Pistons
Clearance, piston and cylinder new
mm (in) 0.013…0.037 (0.0005…0.0015)
Wear limit
mm (in) 0.060 (0.0024)
Piston diameter “A”
Installed dimension
mm (in) 56.37 ± 0.005
(2.2193 ± 0.00002)
61.97 ± 0.005
(2.4398 ± 0.00002)
Piston diameter “B”
Installed dimension
mm (in) 56.38 ± 0.005
(2.2197 ± 0.00002)
61.98 ± 0.005
(2.4402 ± 0.00002)
Technical Data
C1
C1 200