A main bearing removal device for use with an engine having one or more main bearing supports including arcuate bearing seats, a crankshaft having a journal surface adjacent each bearing seat, an arcuate bearing shell in each bearing seat between the bearing seat and the crankshaft journal surface, a pair of stud bolts flanking each bearing seat and projecting parallel to each other from the main bearing support and a nut on each stud bolt, the device comprising, in combination:.
In particular, piston-type internal combustion engines include crankshafts which are held in bearings called main bearings and distributed along their length. In the maintenance of such engines, it is often desirable to remove a worn bearing so that a replacement bearing can be inserted. It is particularly desirable to be able to do so without removal of the crankshaft.
The main bearing is generally split into upper and lower shells, and the lower main bearing shell is easily removed with the bearing cap.
However, the upper main bearing shell is located between the crankshaft bearing surface and the bearing seat in the engine block and is often frozen or stuck to the bearing seat so that it must be forced out.
The upper main bearing shell generally engages the bearing seat in some way so that it cannot be rotated out of the bearing seat in the direction of crankshaft rotation. However, if the crankshaft journal is equipped with an oil passage, a special tool can be inserted therein to push the upper main bearing out of the bearing seat upon crankshaft rotation opposite to the normal rotation. In many engines, however, some journals contain no such oil passages; and this method cannot be used.
For such bearings, such expedient means as a piece of metal and a hammer or a jack braced against some portion of the engine are usually effective but fraught with danger of possible damage to either the user or the engine.
The device generally comprises a ratchet-and-pawl jack which is mounted on at least one of the stud bolts flanking the bearing and operated by alternately tightening and loosening the nut mounted on that stud bolt. The device is so designed that the user obtains the leverage of the threads in the stud bolt and nut; and the forces are applied against the stud bolt, which is designed to withstand forces far greater than those required to remove a main bearing shell.
The device generally comprises two members: a reciprocable jack member which is mounted on the stud bolt and includes a pivotable pawl; and an arcuate ratchet member which is placed on the crankshaft journal end to end with the upper main bearing shell and includes ratchet teeth on its outer surface.
As the nut is alternately screwed down and back on the stud bolt, the pawl engages each of the ratchet teeth in turn and gradually moves the arcuate ratchet member into the bearing seat, thus pushing the main bearing shell out of the bearing seat. Further details and advantages of this invention will be apparent from the accompanying drawings and following description of a preferred embodiment. As shown in FIG. Thus, an upper main bearing shell 14 is shown in the bearing seat 12, although it has been pushed part way out of the bearing seat 12 in FIG.
A pair of stud bolts 16 and 17, flanking the bearing seat 12, project outward from the main bearing support 10 to the right in FIG. Each of stud bolts 16 and 17 is held in the main bearing support 10 in the normal manner and carries a threaded nut 18 on its free end. Normally, a bearing cap, not shown, with a lower main bearing shell, also not shown, would fit over stud bolts 16 anf 17 and be fastened securely to the main bearing support 10 by the nuts Slide the new filter straight into the slot until it is flush with the opening.
Gently push the filter cover back into place. You should feel or hear the four retaining clips "click" securely into place.
Double check that the cover is secure before moving on to the next steps. Slide the metal retaining pins in from the outside towards the center of the glove box. Raise the glove box up towards the dashboard. Slide the plastic mount up into the slot and insert the small button into the larger hole. Move the button forward and up from the larger hole into the smaller hole. The button should "pop" back securely into place. Close the glove box. Move the plastic panel below the glove box on either side of the knee airbag back into the correct position around the hinges.
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