4.20. Removal of a bent shaft

Removal of a bent shaft is possible only from the engine taken from the car. It is meant that a driving disk, the gas-distributing belt, the case pallet, a maslozabornik, the oil pump and conrod and piston assemblies are already dismantled. Dismantle of assembly of covers of radical bearings has to be made before removal of rods (see Removal of conrod and piston assemblies). Before removal of a bent shaft it is also necessary to otboltit and separate from the block of cylinders the holder of a back epiploon (see Replacement of a back epiploon of a bent shaft).

Order of an otpuskaniye of bolts of fastening of assembly of covers of radical bearings


  1. Before starting extraction of a bent shaft from the engine, measure the size of its axial side play. Fix the dial measuring instrument of plunger type (DTI) on the block to coaxially bent shaft, having rested its plunger against a cheek of one of cranks.

Assembly of covers of radical bearings has to remain on the place, and its fixture is tightened with the required effort.

  1. Push a bent shaft against the stop back and nullify the device indicator. Now push a shaft in an opposite direction and consider the indication of the measuring instrument. The size of a free wheeling of a shaft in the longitudinal direction is also its axial side play. Compare result of measurement to requirements of Specifications. If the side play exceeds the maximum admissible value, check persistent surfaces of a shaft for existence of signs of excessive wear. In the absence of obvious signs of wear replace the persistent (fourth) bearing, installation of new persistent washers usually helps to correct a situation.
  2. In the absence of near at hand dial measuring instrument it is possible to use the ordinary probe of lezviyny type. Accurately shift a shaft against the stop forward on the engine, then determine the size of the formed gap between a cheek of a crank and a back wall of the persistent radical bearing, having densely put in it the corresponding thickness a probe edge(s).
  3. Working in strictly certain order (see the illustration Order of an Otpuskaniye of Bolts of Fastening of Assembly of Covers of Radical Bearings), in stages (on 1/4 turns for approach) weaken bolts of fastening of assembly of covers of radical bearings so that the possibility of their reversing manually appeared. Remove assembly — try not to drop inserts of radical bearings.
  4. Carefully take a bent shaft from the engine (use the help of the assistant). Track that inserts of radical bearings remained in the beds in the block and covers. Install assembly of covers on the block, then by hand tighten bolts of its fastening.