BMW C1 Repair Manual page 86

Technical Data
Valve seat angle
Inlet
Exhaust
Included angle between valves
Inlet
Exhaust
Valve seat width
Inlet
Wear limit
Checking dimension
Exhaust
Wear limit
Checking dimension
Valve seat face
Wear limit
Bucket tappets (wear limit)
Extl. dia.
Radial clearance in cylinder head
Guide dia. in cylinder head
Valve spring
When new (uncompressed)
Wear limit
Oil circuit valve
Compression spring for pressure-relief
valve, uncompressed
Wear limit
Piston
Clearance, piston and cylinder new
Wear limit
Piston diameter
"A"
On installation
Piston diameter
"B"
On installation
11.8
C 1
° 45
° 45
° 16
° 18
mm (in) 1.185...1.215 (0.0466...0.0478)
mm (in) 2 (0.0787)
mm (in) 1.0...1.4 (0.0394...0.0551)
mm (in) 1.385...1.415 (0.0545...0.0557)
mm (in) 2 (0.0787)
mm (in) 1.2...1.6 (0.0472...0.0630)
2
mm 0.8 (0.0315)
2
(in) 0.6 (0.0236)
2
mm
2
(in)
mm (in) 25.980...25.993 (1.0228...1.0234)
mm (in) 0.100 (0.0039)
mm (in) 26.007...26.008 (1.0239...1.0239)
mm (in) 36.93 (1.454)
mm (in) 36.7 (1.444)
mm (in) 13.5 (0.5315)
mm (in) 13.4 (0.5276)
mm (in) 0.013-0.037 (0.0005-0.0015)
mm (in) 0.06 (0.0024)
mm (in) 56.37 ±0.005 (2.2193 ±0.00002)
mm (in) 56.38 ±0.005 (2.2197 ±0.00002)