Before replacement of the front oil seal, you should drain the cooling system and then also remove the fan shroud, the radiator, the fan as well as the pulley. On 7.5L engines, remove the final drive belt. Next, unscrew the big nut and washer from the crankshaft nose but make sure that the crankshaft will not turns. Using a good puller, remove the vibration damper, then by the use of chisel and hammer, remove the old seal from the
Timing Cover and from the crank shaft as well. Sweep the groove in the cover, apply motor oil in the circumference of the new sealing ring, and then insert it in place together with a seal driver or a large socket, making sure the spring is rightly placed. Engine oil should be applied on the crankshaft nose, the inner part of the vibration damper, including the seal seat, and keyway of the damper hub should be coated with RTV sealant. Position the damper keyway in line with the crankshaft key; engage the damper and bolt and washer and tighten to the specified torque rating. After removal, the operations are in the opposite sequence of installation; the next steps for the engine are refilling with oil and coolant and running through of the leak test whereby the engine is started immediately after installation. Regarding the rear main oil seal, all the VB engines up to 1983 used a two part seal while starting from 1984 the engines used a one part seal, apart from the 7.5L engine which remained using the two part seal. To change the two-piece seal, one will have to drop the
Oil Pan to have access, loosen the main bearing cap screws by about ¼ turn, and then pull the rear main bearing cap to pull out the oil seal. To remove the part of the seal in the block, one will require a small sheet metal screw and it should not be used with force considering the delicate crank shaft surfaces. Remove carbon deposits and dirt from the grooves in the cap and block, coat the new seal halves with clean engine oil and fit the upper seal with the lip at the front of the engine and it should project as per the standard. Torque the main bearing cap bolts, fit the lower seal in the cap, use some RTV sealant on the surfaces that touch each other and put back the rear main bearing cap in such a way that the seals will align well. Closely torque the cap bolts, fit the oil pan and the
Oil Pump and then carry on with the reverse procedure. Last but not the least, add the oil and coolant in the engine and look for any sign of leakage once the engine has been started.