Crankshaft Main Bearing: Service and Repair
11 21 531 - Replacing all crankshaft main bearings (N14)
Special tools required:
- 11 4 470
Important!
Modified assignment of bearings.
Bearing (1) is at the output end (clutch end)
Determine main bearing colors; the designations on the crankcase and crankshaft are always required and can only determined using the table.
Necessary preliminary tasks:
- Remove crankshaft Service and Repair.
Installation Note:
Bearing shell (1) with lubricant groove must be fitted in crankcase upper section.
Bearing shell (2) without lubricant groove must be fitted in crankcase lower section (bedplate).
Important!
Modified assignment of bearings.
Bearing (1) is at the output end (clutch end)
Bearings (1 to 5).
Bearing (2) is a guide bearing.
Important!
Clean sealing surfaces.
Do not clean sealing faces with a metal-cutting tool.
Clean sealing faces with special tool 11 4 470 only.
Insert guide rings (1) in crankcase at bearing block (2) with groove facing outwards.
If necessary, attach with engine oil to crankcase.
Important!
Modified assignment of bearings.
Bearing (1) is at the output end (clutch end)
Bearings (1 to 5).
Important!
Clean sealing surfaces.
Do not clean sealing faces with a metal-cutting tool.
Clean sealing faces with special tool 11 4 470 only.
Bearing classification on crankcase upper half:
Bearing allocation 1-5: the designations on the crankcase and crankshaft are always required.
Refer to the table for the color code.
Example:
Bearing 1. - Letter P
Bearing 2. - Letter K
Bearing 3. - Letter I
Bearing 4. - Letter N
Bearing 5. - Letter N
Bearing classification on crankcase upper half:
Bearing allocation 1-5: the designations on the crankcase and crankshaft are always required.
Refer to the table for the color code.
Example:
Bearing 1. - Letter T
Bearing 2. - Letter Q
Bearing 3. - Letter Q
Bearing 4. - Letter R
Bearing 5. - Letter R
Crankshaft bearing colors:
BL= - Blue.
SW= - Black.
Gr= - Green.
Ge - Yellow.
Or - Orange.
Bearing classification on crankcase lower half:
Bearing allocation 1-5: the designations on the crankcase and crankshaft are always required.
Refer to the table for the color code.
Example:
Bearing 1. - Letter P
Bearing 2. - Letter K
Bearing 3. - Letter I
Bearing 4. - Letter N
Bearing 5. - Letter N
Bearing classification on crankcase lower half:
Bearing allocation 1-5: the designations on the crankcase and crankshaft are always required.
Refer to the table for the color code.
Example:
Bearing 1. - Letter T
Bearing 2. - Letter Q
Bearing 3. - Letter Q
Bearing 4. - Letter R
Bearing 5. - Letter R
Crankshaft bearing colors:
BL= - Blue.
SW= - Black.
Gr= - Green.
Ge - Yellow.
Or - Orange.
Example: Crankcase upper half:
Combining the dots of the designations of the crankshaft and crankcase produces the following color combinations.
Bearing 1: The letters (P and T) produce in the crankcase upper half the color Ge = Yellow with lubricant groove.
Bearing 2: K and Q = Ge = Yellow.
Bearing 3: I and Q = Ge = Yellow.
Bearing 4: N and R = Gr = Green.
Bearing 5: N and R = Gr = Green.
Example: Crankcase lower half:
Combining the dots of the designations of the crankcase and crankshaft produces the following color combinations.
Bearing 1: The letters P. and T. produce in the crankcase lower half the color Gr = Green without lubricant groove.
Bearing 2: K and Q = Gr = Green.
Bearing 3: I and Q = Gr = Green.
Bearing 4: N and R = Gr = Green.
Bearing 5: N and R = Gr = Green.
Check spray nozzle (2) for damage, replace if necessary.
Release screw (1).
Tightening torque: 11 11 8AZ. Specifications
Remove oil spray nozzle (2).
Installation Note:
Oil spray nozzle (2) is turned when screw (1) is tightened and then rests with its upper corner against crankcase.
Install crankcase lower section Service and Repair.
Assemble engine.