Forward cuff of a cranked shaft
M43TU engine
1. Oil seal replacement is described in paragraph 6 as part of the timing chain lower cover removal procedure.
N42 engine
2. Remove the damper pulley from the crankshaft toe (see paragraph 5). Don't remove the stand.
3. Mark the installation depth of the cuff in the cover. On engines with which we had to have a depot, the cuff was installed flush with the outer plane of the cover.
4. Remove the old cuff with a hook. Alternatively, drill a couple of holes in the cuff, screw screws into them and pull out the screws with pliers along with the cuff (pic. 18.4). Lubricate the drill bit with grease so that all the chips stick to it. Be careful not to damage the pulley hub or the working surfaces of the block and crankshaft under the cuff. If these methods fail to remove the cuff, remove the pulley hub and cut the cuff with a chisel.
5. Wipe the pulley hub and collar area in the housing. Lubricate the surface of the hub with engine oil.
6. The new cuff is supplied with an adjusting mandrel. Insert a new cuff into the mandrel and put the mandrel on the hub.
7. Align the two horizontal grooves on the side surfaces of the cuff with the plane of the engine crankcase connector (pic. 18.7.3). Then press the cuff to the previous depth using a piece of pipe that rests only on the outer, hard part of the cuff (pic. 18.7.6).
8. Using the tools supplied with the BMW oil seal replacement kit, coat the oil seal grooves with the primer included in the kit.
9. Using the syringe included in the kit, fill both grooves with sealing compound (pic. 18.9). Cover the ends of the grooves with soil.
10. Install the pulley with damper on the crankshaft as indicated in paragraph 5.
Rear collar of the crankshaft
M43TU engine
11. Follow the steps in paragraph 14 of chapter 2B.
N43 engine
12. Remove the flywheel as directed in paragraph 19.
13. Measure and record the insertion depth of the cuff.
14. Drill a couple of holes in the cuff, screw the screws into them and pull out the screws with pliers along with the cuff (see fig. 18.4).
15. Wipe surfaces of a cranked shaft and the case under a cuff. Lubricate the surface of the crankshaft under the cuff with engine oil.
16. The new cuff is supplied with an adjusting mandrel. Insert a new cuff into the mandrel and put the mandrel on the crankshaft toe.
17. Align the two horizontal grooves on the side surfaces of the cuff with the plane of the engine crankcase connector (see fig. 18.7.a). Press the cuff to the previous depth using a piece of pipe that only rests against the outer, hard part of the cuff (see fig. 18.7.6).
18. Using the tools supplied with the BMW oil seal kit, coat the oil seal grooves with the primer included in the kit.
19. Using the syringe included in the kit, fill both grooves with sealing compound (see fig. 18.9). Cover the ends of the grooves with soil.
20 Install the flywheel as described in paragraph 19.