Crank Mechanism, Dismantling

Crank mechanism, dismantling

Special tools:
999 5679 Oil filter spanner 999 5679 Oil Filter Spanner
999 5746 Holder 999 5746 Holder

Note! As the illustrations in this service information are used for different model years and / or models, some variation may occur. However, the essential information in the illustrations is always correct.

Preparatory work





Remove the bearing retainer for the right drive shaft.





Remove:
- the 4 x M6 screws
- the oil cooler. Discard the O-ring
- oil filter use 999 5679 Oil filter spanner 999 5679 Oil Filter Spanner , discard filter.

Removing oil sump




Remove the screws, 20 x M6.




Remove the screws holding the oil sump to the intermediate section, 17 x M8 and 1 x M6.
Tap carefully on the side of the oil sump with a plastic mallet.
Lift away the oil sump.




Remove the oil delivery pipe nuts, 2 x M6 and 2 x M8. Discard the gasket.
Check the pipe and the strainer. Check for cracks and contaminants.
Remove the oil splash plate.

Removing the oil pump





Remove:
- the 3 x M6 screws for the oil pump
- the oil pump.

Checking markings




Install two old flywheel/drive flange screws at the trailing edge of the crankshaft.
Turn the crankshaft so that 1st cylinder's piston is at bottom dead center (BDC).
Check that there are markings on the cap and connecting rods. Check which way the markings are positioned (exhaust and intake side).
Make a note of this.

Removing pistons from the block





Caution! The bearing covers are not interchangeable. Also note the position of the bearing caps in relation to the rotation of the crankshaft.

Remove the screws for the connecting rod cover. Lift off the cover. Ensure that the bearing cover comes with it.
Install: 999 5746 Holder 999 5746 Holder in the connecting rod and press out the connecting rod/piston.
Hold your hand under the piston so that it does not fall to the floor, and make sure that the bearing half also comes out.
Place the piston and connecting rod in such a way that they will be reinstalled in the correct cylinder. Continue with cylinders 2, 3, 4, 5, 6, 7, 8 as above.

Removing the intermediate part's bolted joint





Remove:
- the 14 x M8 screws
- the 20 x M10 screws. Start at the outer edges and work alternately towards the center.

Separating the intermediate section/cylinder block

Caution! Ensure that the bearing covers are not mixed up. Also not the position of the upper half of the axial bearing for the direction of rotation of the crankshaft. The crankshaft must not rotate!

Carefully pry apart the intermediate part/engine block so that a clearance approx. 6-8 mm is obtained.
Then carefully tap off the intermediate section using a rubber mallet.
Lift out the intermediate section.
Ensure that the bearing covers for the intermediate section come with it.

Note! The bearing covers for the different bearing recesses are not interchangeable.

Ensure that the screws for the flywheel and carrier plate, which were installed earlier, are properly tightened.
Lift them and the front of the crankshaft.
Carefully lift the crankshaft straight up.
Remove the remaining bearing halves.

Cleaning

Clean the gasket plane on the engine block, intermediate section and oil sump.
Use a razor blade or a gasket scraper