4.29. Installation of a bent shaft and check of working gaps of radical bearings

Turn the engine upside down. Give fixing bolts and remove assembly of covers of radical bearings. If did not do it yet, take from the beds in the block and covers old inserts of radical bearings. Wipe beds pure неворсящейся with rags — they have to be perfectly pure.

Wipe backs of new inserts of radical bearings and enclose the halves equipped with an oil flute in the beds in the block, enclose the remained halves of inserts in the corresponding covers of bearings — you remember that the bearing No. 4 is persistent. Track that uvulas of inserts entered reciprocal landing grooves in beds of the block and covers. Oil openings in the block have also to correctly are combined with openings in inserts.

Wipe the surfaces of bearings in the block and radical necks of a bent shaft pure неворсящейся with rags. Check passability of oil openings of a shaft, in case of need clean them. Any foreign particles which are contained in maslotoka eventually inevitably get to bearings. Accurately lay carefully wiped bent shaft in radical bearings of the block. Before finalizing a shaft, it is necessary to check sizes of working gaps in its radical bearings.

Cut the calibrated plastic wire from the measuring Plastigage set pieces, length width of inserts are slightly shorter, and lay on one piece of a wire along each of radical necks of a shaft, parallel to their axis.

Wipe surfaces of inserts in covers and establish assembly of the last on the regular place — try not to shift the pieces of the calibrated wire laid along shaft necks. Slightly oil a carving of fixing bolts and screw them, having recorded covers. Working as it should be, the return to an order of an otpuskaniye of bolts (see the illustration Order of an Otpuskaniye of Bolts of Fastening of Assembly of Covers of Radical Bearings), in several stages tighten bolts of fastening of assembly of covers with the required effort (see Specifications).

Turn out bolts and carefully remove assembly of covers of radical bearings — try not to damage the flattened-out calibrated wire and do not turn a shaft. If any of covers does not give in to removal, accurately tap it for release by the hammer with soft brisk.

Determine the size of working gaps of bearings by width of the flattened-out threads measured on the scale applied on packing of the Plastigage set. Compare results of measurements to requirements of Specifications.

If the size of a gap goes beyond admissible limits, perhaps, inserts not of that standard size were established (see Check of a state and selection of inserts of radical and conrod bearings of a bent shaft). Before looking for new inserts, make sure that under enclosed at this stage dirt or oil did not get. If the calibrated wire is flattened out since one end more than from another, it demonstrates existence of conicity of a neck. Carefully remove the calibrated wire from necks, having scratched out all its traces some not too strong tool (for example, edge of an old credit card). As a last resort, it is possible to use own nail — the main thing that on a surface of necks / inserts there is no scratch left and zadir.

Alternatively working gaps in radical bearings can be determined by a calculation method by carrying out measurements of diameters of radical necks a shaft and internal diameters of bearings (inserts are laid in a bed, assembly of covers is established, the shaft — is not present).

A — Measurement of diameters of radical bearings in assembly of the block
B — Measurement of diameters of radical necks of a bent shaft

If reduction of working gaps in norm by selection of inserts of the standard size is not possible, the shaft has to is appropriately pierced, and inserts are replaced by repair.

The pro-point of a shaft has to be made taking into account the minimum admissible size galtel. At a pro-point of a bent shaft depth galtel of L should not appear less than 0.1 mm.

Carefully take a bent shaft from the engine. Wipe the surfaces of bearings in the block and evenly grease them with a thin layer of molibdensoderzhashchy assembly motive lubricant. Do not forget to grease persistent washers also.

Make sure of absoluteness of purity of necks of a bent shaft, then grease (the same lubricant) the surfaces of pins contacting to epiploons and accurately lay a shaft in the block. Wipe and grease surfaces of inserts in the block and covers. Having deployed the block in bulk up, fill in it conrod and piston assemblies (see Installation of conrod and piston assemblies and check of size of working gaps in conrod bearings of a bent shaft). Install assembly of covers of radical bearings on the engine. Slightly oil a carving part and the lower surfaces of heads of fixing bolts, then screw the last and tighten them by hand. Working as it should be, the return to an order of an otpuskaniye of bolts (see the illustration Order of an Otpuskaniye of Bolts of Fastening of Assembly of Covers of Radical Bearings), in several stages tighten bolts of fastening of assembly of covers with the required effort (see Specifications). Several times turn a bent shaft manually, checking freedom of its rotation. In conclusion by means of the probe of lezviyny type or the dial measuring instrument of plunger type determine the size of an axial side play of a shaft (see Removal of a bent shaft). If persistent surfaces of a shaft are not worn-out and are not damaged, and bearings are replaced on new, the axial side play should not exceed the limit of admissible range. Establish a new back epiploon of a bent shaft and a priboltita to the block his holder (see Replacement of a back epiploon of a bent shaft).