Ducati Diavel
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Ducati Diavel Service Manual: Main bearings

The main bearings have are of the angular contact type with offset inner races so that the balls transmit loads from one groove to the other along straight lines at an angle to the axis of the bearing. The angle-contact ball bearings are designed for bearing combined loading (radial-axial loads).

Bearings of this type can bear thrust loads in one direction only. In fact, under the action of a radial load inside the bearing, an axial force is created that must be counterbalanced by an axial force acting in the opposite direction; that is Why these bearings are generally fitted back to back in pairs.

Note

The main bearings supplied can be bearings with bushing (a) or flanged bearings (b) with the bushing integrated in the external ring of the bearing.

To renew the bearings proceed as follows:

Main bearings


Main bearings


Bearings with bushing

Important

On worn engines, the bearing holder may no longer be a tight fit in the crankcase half.

After having removed the bushing, check that the interference fit between the crankcase and the bushing, with bearing fitted, is no less than 0.03 Mm, otherwise, replace the crankcase halves.

Note

Fit the bearings (1) and (18) orienting them so that the side with the "letter" (c) is facing the bushings (2) and (17).

Bearings with bushing


Flanged bearings

Important

On badly worn engines, bearing outer rings may have developed clearance in the crankcase halves - normally, bearing outer rings are interference-fit in the casing.

Check that the interference fit between the crankcase and the bearings (1) and (18) installed, is not less than 0.03 Mm, otherwise, replace the crankcase halves.

Flanged bearings


Important

After installing new main bearings, shim the crankshaft as described in the paragraph "shimming the shafts" and "reassembly of the crankcase halves" of this section.

Overhaul of the crankcase halves
Carefully examine the engine crankcase halves. Check that the surfaces of the crankcase halves are perfectly flat using a reference surface. Check that the bearings (1) and (18), and the bushing ...

Reassembly of the crankcase halves
The crankcase halves must be in good condition and perfectly clean. The mating surfaces must be perfectly flat and free from burrs. Overhauling the alternator-side crankcase half The following pa ...

Other materials:

Useful information for safe riding
Warning Read this section before riding your motorcycle. Many accidents are the result of the inexperience of the rider. Always make sure you have your licence with you; you need a valid licence that entitles you to ride a motorcycle. Do not lend your motorcycle to persons who are inexperie ...

Operating principle of dtc
The bbs receives the front and rear speed information from the abs over the can. Then, the bbs sends the vehicle speed information to be displayed on the dashboard over the can. If the tangential speed of the rear wheel exceeds the tangential speed of the front wheel by a given percentage, t ...

Removal of the exhaust system
Remove the silencer, as described in the paragraph "removing the silencer" of this section. Loosen the screws (28) and remove the exhaust by-pass valve cover (27). Turn the exhaust valve pulley (a) to facilitate the throttle cable (25) output. Release the end fitting (b) of the cable ...

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