Model 2120 Tractor TM-4252 (Dec-70) Engine 20 Cylinder Head, Camshaft and Balancer Shafts 10-7 JD247 Fig. 12 Drift JD 249 to Remove and Install Balancer Shaft Bushings 1 Bushings m Cam shaft bore Fig. 11 Pressing Gear on Balancer Shaft by means of Special Tool No. JD 247 After driving in new bushings, secure as follows, with the aid of special tool No. JD 255. c Installation mark REPLACING BALANCER SHAFT BUSHINGS JD 255 NOTE: The front and centre bushings can be replaced with the engine in position. It is necessary to separate engine and clutch housing , when replacing the rear bushing. Using driver JD 249, drive out old bushings from cylinder block.
From the timing gear side, drive in new bushings with the aid of driver JD 249, insuring that face of bushings does not protrude over countersunk part of cylinder block bores. Fig. 13 Securing a Balancer Shaft Bushing in Cylinder Block with the Aid of Special Tool No. JD 255 CAUTION: Install each bushing so that its oil bore "h" (fig. 14) is aligned with cylinder block oil bore "i" on cylinder head side and that the bushing recess, in which ball "k" of special tool JD 258 engages, corresponds with oil channel "g". e, d Special Tool No. JD 25& NOTE: The half-round part "d" (figs. 13 and 14) of special tool No.
JD 255 is, with regard to ball "k'\ unsymmetrical, fitting properly only in one position into the bushing bore (see fig. 14). Printed in Germany