Conrod with M11x1.25 conrod bolt:
WARNING: This page is about a different car, the 2002 BMW M Roadster, 2002 BMW M Coupe, 2001 BMW M Roadster, and 2001 BMW M Coupe. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
Contrary to the instructions for all other BMW engines, the conrod bolts must NOT be replaced in the S54 engine with the M11x1.25 conrod bolt. The M11x1.25 may only be reused in the same conrod thread.
CAUTION:
Do not distort conrods or crankshaft.
Tighten down conrod bolts with special tool 00 9 120. See Figure . Tightening torque:
Remove bearing caps. Read off bearing clearance at width of crushed plastic thread with aid of measuring scale. See Figure . Conrod bearing clearance: 0.030 to 0.070 mm.
CAUTION:
If a bearing clearance of below 0.030 mm is measured, replace conrod bearing shells. If a bearing clearance of below 0.030 is measured with the new conrod bearing shells, replace the conrods with a complete set of conrods with M10x1.25 conrod bolts
.
CAUTION:
The M11x1.25 may only be reused in the same conrod thread.
- Remove plastic thread.
- Coat crankshaft and bearing shells with oil.
- Fit bearing caps so that the pair numbers match up.
- Fit the conrod bolts used for the bearing clearance.
- Insert conrod bolts.
Tighten down conrod bolts with special tool 00 9 120. See Figure .
CAUTION:
The tightening torque only applies to conrod bolts with M11x1.25 threads.
Tightening torque:
- Application torque 5 Nm
- Joining torque 30 Nm
- Angle of rotation 70°
Install spray nozzles for piston cooling, tighten down screw. See Figure . Tightening torque, 11 11 7AZ. Refer to 11 11 ENGINE BLOCK .