Insert the intermediate shaft into the rear cover of the gearbox housing and measure the depth of the rear cover, i.e. back cover mating distance (with gasket installed) and a lock ring of the forward bearing of an intermediate shaft (see photo).
Notes. If the countershaft rear bearing remains in the gearbox housing rear cover seat (due to the strong interference of the outer ring of the bearing when pressed into the seat), heat the back cover to facilitate the removal of the bearing, without exceeding the temperature of 80-100X.
Both measured dimensions: the depth of the rear cover of the gearbox housing and the length of the countershaft gear cluster must be the same. If they are different, then the difference between them will be equal to the thickness of the adjusting rings mounted on the front bearing of the intermediate shaft. If the total thickness of the shims reaches or exceeds 0.4 mm, install shims of equal thickness on both ends of the shaft to ensure the correct relative position of the countershaft, output and input shaft gears. In the atom case, heat the rear cover of the gearbox housing to a temperature of 80-100°C, making sure that the burner flame does not touch the plastic driven gear of the speedometer drive, and install half of the adjusting rings under the rear countershaft bearing.