CRANKSHAFT AND MAIN BEARINGS-H.4 3. Place the crankshaft in position. 4. Locate the upper thrust washer in position as shown in Fig. H.6. 5. Fit the three lower bearing shells, oil, and fit the three main bearing caps in their respective loca- tions. NOTE: Ensure at this stage that the two lower thrust washer halves are positioned correctly either side of the rear f\lain bearing cap when it is fitted. 6. Check the main bearing setscrews prior to fitting for signs of stretch or thread damage. Where damage or any doubt exists fit new replacements. 7. Fit the setscrews then tighten evenly to the torque tension given on Page B.2. 8.
Check that the crankshaft can be rotated freely, if satisfactory check the crankshaft end float by means of feeler gauges as shown in Fig. H.7. Should it not be within the limits quoted on Page B.6, then oversize thrust washers are available to give the necessary adjustment. (Refer to Page H8 H.1J. 9. Fit new sealing strips to the rear main bearing oil seal housings and refit the housings as described under the heading "Crankshaft Rear End Oil Seal" below. 10. Liberally oil the crankpins, locate the connecting rod bearing shells, again ensuring their correct relative positions, then fit the connecting rod caps as described on Page F.5. The crankcase should now be as shown in Fig. H.2. 1.
Set up a half housing in the vice with the seal recess uppermost. 11. Refit the lubricating oil pump complete with suc- tion and delivery pipes. (Refer to Page L.4). 2. Settle approximately 1 in (25 mm) of the strip, at each end, into the ends of the groove ensuring that each end of the. strip projects 0.01010.020 in (0,25/0,50 mm) beyond the half housing joint face. 12. Refit the sump using new seals and joints. (Refer to Page L.1). 3. With the thumb or finger press the remainder of the strip into the groove, working from the centre, then use any convenient round bar to further bed in the strip by rolling and pressing its inner dia- meter as shown in Fig. H.8.
This procedure takes advantage of the friction between the strip and the groove at the ends to compact the rope, whilst ensuring that the projections of the end faces of the rope remain as set. 13. Refit the timing case back plate, fuel pump drive hub, timing gears, timing cover and crankshaft front pulley. (Refer to later text commencing on Page J.1 for their reassembly. 14. Refit and correctly align the flywheel housing as described on Page P.2. 15. Refit the flywheel and starter motor. CRANKSHAfT REAR END OIL SEAL 4. Fit the sealing strip to the other half housing in a similar manner. This sealing arrangement consists of two half housings bolted around the rear of the crankshaft.
The bore of these housings is machined to accommodate a rubber cored asbestos strip which, in conjunction with a right hand helix machined between the thrust collar and the flywheel mounting flange to the dimensions given on Page B.6, acts to return the surplus oil reaching the seal. The two half housings fit over this helix and the contact of the sealing strips with the crankshaft pre- vents leakage beyond this point. 5. Remove all traces of the old joint from the cylinder block rear face and fit a new joint treated with a suitable jointing compound. 6. Lightly coat the faces of the housing with a suit- able jointing compound. 7.
Spread a film of graphite grease over the exposed inside diameter surface of the strip. 8. Assemble the half housings around the crankshaft rear journal and fasten together by the two set- screws (See Fig. H.3). NOTE: When traces of oil become apparent from behind the flywheel and a faulty rear oil seal is sus- pected, first ensure that the crankcase is breathing normally. Any build up in crankcase pressure could cause oil to be forced past the rear sealing arrange- ment. If crankcase pressure is normal and new seals require to be fitted the following procedure should be adopted with the crankshaft in position. 9.
Swivel the complete seal housing on the shaft to bed in the strips, and to establish that the assembly turns on the crankshaft. 10. Bolt the seal housing in position on the block and the rear main bearing cap then finally tighten the securing setscrews.