Check the gap between the bushings and the bipod shaft, which should not exceed 0.10 mm. If the gap is greater than specified, then replace the bushings using the A.74105 mandrel.
On the inner surface of the bipod shaft bushings there are spiral grooves that extend only to one side of the bushing. When pressing bushings, position them so that their ends with groove outlets are inside the crankcase opening, and the groove outlets are opposite each other. The ends of the bushings should be buried in the crankcase hole by 1.5 mm.
Lubricate new bushings with transmission oil before pressing.
After pressing into the crankcase, finish the bushings with a reamer A.90336 to a size of 28.698-28.720 mm. The mounting gap between the bipod shaft and bushings should be within 0.008-0.051 mm.
Check the ease of rotation of the bipod shaft roller on the ball bearing. The ball bearings of the worm and roller must rotate freely, without jamming; on the surface of the rings and balls there must be no wear and damage.
Check the axial clearance between the head of the adjusting screw 8 (rice. 5-5) and the groove of the bipod shaft 7. The gap should not exceed 0.05 mm. If it is larger, replace the adjusting plate 9 with a thicker one.
Note. Spare parts are supplied with adjustment plates in eleven sizes, with a thickness of 1.95 mm to 2.20 mm; the increase of each size is 0.025 mm.
Check the condition of the fixing plates 5 (rice. 5-3). If they are deformed, replace them.