SECTION H Crankshaft and Main Bearings (0.19 mm oversize) thrust washers are available which if used on one side of the rear main bearing only will reduce crankshaft end float by 0.0075 in (0.19 mm) and by 0.D15 in (0.38 mm) if used on both sides The limits for the crankshaft end float are given on Page 8.6. The main bearing caps are numbered and are not interchangeable. The main bearing shells are located by means of tabs which locate in slots in the bearing housings. NOTE:
Before renewal of the main bearings is attempted make absolutely certain that the correct replacements are available, reference to the relevant parts list will ensure this, but for identification purposes the new bearings should have an annular groove machined in the inner (bearing) face along the centre line of the feed holes, when the bearings are correctly located these feed holes will correspond exactly with those machined in the cylinder block. On later 4.107 and 4.99 engines, the annular oil groove in the main bearing parent bore (cylinder block and bearing cap) has been deleted.
Adequate lubrication is maintained by repositioning the oil feed holes radially in the shell bearings and continuing to machine the annular groove in the bearing on the centre fine of these feed holes. H1 Description The crankshaft runs in three pre-finished replaceable thinwall, steel backed, aluminium tin lined bearings. Crankshaft end lIoat is controlled by thrust washers located either side of the rear main bearing. 0.0075 in These later type shell bearings may be used on both early and later type engines, whereas the early type of shell bearings must NOT on any account, be fitted to later engines where the annular groove in the main bearing parent bore has been deleted. H2