CRANKSHAFT AND MAIN BEARINGS-H.2 H3 H4 To Renew Main Bearings and Thrust Washers 7. Rotate the bearing shell on the crankshaft until it locates correctly with the tag in the machined slot. 8. Locate the lower half bearing shell in the main bearing cap, liberally lubricate and refit. 9. Tighten the two securing setscrews to positively locate the bearing shells then slacken a turn or two. 10. Repeat items 3-8 for the remaining two bearings. NOTE: To enable the rear main bearing cap to be removed, first remove the two oil seal housing setscrews as shown in Fig. H.3. 11. Finally tighten the main bearings to the torque given on Page B.2.
Removal of the main bearings and thrust washers can be carried out without removing the crankshaft by the following procedure:- 1. Remove the engine from its application. 2. Remove the sump and suction pipe assembly. 3. Slacken the setscrews which secure the main bearing caps. 4. Remove completely one of the main bearing caps and remove the bearing shell from the cap. 5. Remove the top half of the bearing shell by push- ing it, on the opposite side to the one having the locating tag, with a suitable strip of wood and rotating it on the crankshaft as shown in Fig. H.1. 6.
Inspect the bearing shells and if replacements are necessary continue by lightly lubricating and in- serting the new top half bearing shell, plain end first, into the side having the tag location. Renewal of the thrust washers is accomplished by carrying out the following procedure:- 1. Remove the two setscrews securing the two rear main bearing oil seal half housing as shown in Fig. H.3 and remove the half housing from the bearing cap. 2. Remove the rear main bearing cap securing set- screws. 3. Remove the rear main bearing cap and from it the two lower half thrust washers. (Refer Fig. H.4). 4.
The single upper half thrust washer is removed by rotating it with a thin piece of wood until it can be I ifted out of its recess. NOTE: The new thrust washers should be lightly lubricated before fitting. The steel faces of the lower thrust washers should face inwards towards the bearing cap, (Refer Fig. H.5), the steel face of the upper thrust washer should also face in- wards. 5. Locate the upper thrust washer half as shown in Fig. H.6, place the lower halves either side of the rear main bearing cap as described and refit the cap. 6. Tighten the setscrews evenly and finally to the torque given on Page B.2. H5