TIMING CASE AND DRIVE-J.4 J9 J7 5. Examine the drive hub also the bearing in which it runs for signs of excessive wear, surface cracks pitting etc. ' 9. Bring crankshaft up to T.O.C. fer Nos. 1 and 4 pistons, No. 1 piston being on its compression stroke and mark new fuel pump gear with a scribed line to coincide with the scribed line on the fuel pump driving hub: also stamp two dots on the new gear to coincide with the single dot on the idler gear. 10. When replacing a fuel pump, it will be neces- sary to adjust the timing gem blacklash to within the limits prescribed on Page J.2. NOTE:
The bearing is an interference fit in the cylinder block and replacement is carried out by means of a suitable dolly and puller or press if the block is completely stripped. the new one being fitted in the reverse manner. The earlier bronze service bearing had a 0.010 in (0,25 mm) allowance for machining in situ. The current steel bearing is fitted with 2 pre-finished wrapped bushes. To Remove the Fuel Pump Drive Hub To Refit the Fuel Pump Drive Hub 1. Remove the timing case front cover and fuel pump gear. 2. Remove the low and high pressure fuel pipes from the fuel (injection) pump. 3. Remove the fuel pump securing setscrews and withdraw the pump. 4.
Remove the drive hub locating circlip and with- draw the drive hub from its bearing (Refer Fig. J.8) . 1. Replace the drive hub in the bearing and locate with the circlip as shown in Fig. J.9. 2. Check the drive hub end float by means of feeler gauges placed between the front face of the bearing and the rear face of the drive hub. The end float limits are given on Page B.9. 3. Refit the fuel pump as detailed on Page N.6. 4. Refit the low and high pressure fuel pipes to the fuel pump. 5. Refit the fuel pump drive gear, idler gear and hub, timing case front cover etc. To Remove the Timing Case Back Plate 1. Remove the timing case front cover and timing gears. 2.
Remove the fuel pump and drive hub. 3. Remove the securing setscrews and studs (where fitted) . 4. Lift the timing case back plate clear from the cam- shaft and crankshaft gear. NOTE: The crankshaft gear is an interferance fit on the crankshaft. Should its removal become necessary, then this can be accomplished by the use of a suitable puller. To Refit the Timing Case Back Plate 1. Fit the timing case back plate to the cylinder block using a new joint and suitable jointing compound. 2. Refit any studs removed and secure with the set- screws. 3. Refit the fuel pump drive hub and fuel pump. 4. Refit the timing gears, timing case front cover etc. J8