Fitting Pistons (In Car)

Fitting pistons (In Car)





1. Assemble piston and connecting rod by driving in the gudgeon pin, using a plastic mallet and drift. Make sure that the mark on the piston crown faces the timing cover and that the numbers on the connecting rods face the exhaust side.

Important: If one connecting rod is to be changed to a newer type (part no. 91 97 617), all the connecting rods must be changed or the difference in weight will become too great.

2. Fit the gudgeon pin lock ring.

Warning: It is extremely important to fit the lock ring with its opening upwards.

3. Place the bearing halves in place in the connecting rods.
4. Fit Protective collars75 19 531 over the connecting rod studs and oil the piston rings, bearings and cylinder.





5. Fit the piston using piston fitting tool 78 62 287.

Important: Pistons of different makes must not be used in the same engine. The name of the manufacturer is cast inside the piston.





6. Fit the big-end bearing caps with bearing halves (connecting rod numbers facing in the same direction).
Tightening torque: 20 Nm + 70° (15 ft. lbs. + 70°)
7. Fit the subframe and oil sump, see Oil sump (in car).
8. Place a Wedge 83 95 238 between the subframe and oil sump and remove the lifting beam.