TIMING CASE AND DRIVE-J.2 2. Tap back the locking tabs and unscrew the two idler hub securing setscrews. 3. The setscrews, idler gear and hub may now be removed together as shown in Fig. J.1. 4. Clean and thoroughly examine the gear and hub for signs of excessive wear, cracks, pitting, etc. To Refit the Idler Gear and Hub 1. After ensuring that the oilways in the hub and gear are clear, hold the gear in position with the timing marks correctly aligned. NOTE: If the cylinder head assembly has not been, disturbed, then the cylinder head cover and rocker shaft should be removed in order to allow the camshaft to be turned to facilitate the aligning of the timing marks. 2.
Insert the hub as shown in Fig. J.2 so that the holes in the hub and the cylinder block are in alignment and secure with the two setscrews. NOTE: Clearance is provided in the setscrew holes of the idler gear hub, to provide the necessary backlash adjustment for the timing gears. Backlash should be set at the tightest point. J3 To Refit the Camshaft Gear 3. Using the adjustable idler gear, backlash between both crankshaft gear/idler gear and camshaft gear/idler gear should be set within the range given on Page B.9 with the gears held together in order to take up the effect of bearing clear· ance. Blacklash may be checked by the use of feeler gauges as shown in Fig. J.3. 1.
Remove the idler gear and hub, cylinder head cover and rocker shaft (if not previously removed). 2. Refit the gear to the camshaft ensuring that the 'D' marks on the gear and camshaft hub respec- tively align as shown !n Fig. J.6. 3. Refit the three securing setscrews and tighten to a torque of 19-21 Ibf ft (2,6-2,9 kg! m). 4. When the backlash has been correctly set. finally tighten the idler gear hub securing setscrews to the torque given on Page B.2. NOTE: Only the plain (non-slotted) holes in the camshaft gear are to be used and these will align with the tapped holes on the camshaft hub when the 'D' marks are alignment. Refit the idler and gear, case etc., as detailed section. 5.
Check the gear end float as shown Fig. the limits are given on Page B.9. gear the tabwashers. NOTE: The gears appear as shown Fig. 7. the timing case front cover. viously detailed in this section. as pre· up to a hydraulic Remove 2. Remove the three securing setscrews and ease gear away from its location. 3. Examine the gear for signs excessive cracks, pitting, etc. Remove the timing case front cover. J4