Checking Pistons And Cylinders; Assembling Pistons - BMW R 1200 C Repair Manual

Checking pistons and cylinders

Reference
temperature for measurements: ...... 20 °C (68 °F)
•
Measure cylinder bore with internal probe at
20 mm (0.79 in) and 100 mm (3.94 in) from the
top in direction of piston pin, and again at a right
angle to the first measurement.
............................................See Technical data
a
Measuring plane A:......................... 6 mm (0.24 in)
............................................See Technical data
a
•
Install piston rings in cylinder.
•
Determine piston ring clearance using feeler
gauge.
............................................See Technical data
a

Assembling pistons

RS110180
•
Carefully fit piston rings to piston in the following
sequence, using piston ring pliers:
3rd groove - equal chamfer ring
2nd groove - micro-chamfer ring
1st groove - asymmetric, convex oval-section
............................................See Technical data
a
e
Caution:
The tubular-spring ring gap must be at 180° to the
equal-chamfer ring gap.
A
Install with "Top" uppermost.
RS110970
RS110200
R 850
1.
1. 2.
3.
RS110190
11.31