If the oil feed tube is tightened before the rocker shaft assembly, the tube will be
strained or the fitting will be pulled from the end of the feed tube.
(6) Attach oil feed tube (20) to cylinder head assembly but do not tighten the retaining nut (19).
(7) Torque the rocker shaft mounting nuts (9) to 12-15 lb.-ft. (16-20 Nm).
(8) Tighten the oil feed tube (20).
(9) Adjust the valve clearances to 0.012 in. (0.3 mm) as follows:
(a) Turn the engine so that the valves of no. 1 cylinder are in the position of valve overlap, i.e. the
period between the opening of the intake valve and the closing of the exhaust valve.
(b) In this overlap position, adjust the clearances of no. 4 cylinder valves.
(c) With valves of no. 3 cylinder in the overlap position, adjust valves of no. 2 cylinder.
(d) With valves of no. 4 in the overlap position, adjust valves of no. 1 cylinder.
(e) With valves of no. 2 cylinder in overlap position, adjust valves of no. 3 cylinder.
(10) Install alternator (see paragraph 4-51).
(11) Install injector nozzles (see paragraph 5-22).
(12) Install the fuel return line, high pressure fuel lines, and fuel tank return line.
(13) Tighten injector nozzle retaining nuts.
(14) Install water connector (9, Appendix F, Figure 50), new gasket (8), and thermostat (5).
(15) Install new gasket (8, Appendix F, Figure 55) cover (4), and breather tube (10).
(16) Fill the cooling system with clean water and check for water leaks.
(17) Prime fuel system (see paragraph 4-42).
5-16. CRANKSHAFT AND MAIN BEARING MAINTENANCE.
(1) The crankshaft runs in three prefinished, replaceable, thinwall, steelbacked, aluminum, tin-lined bearings.
(2) Crankshaft end float is controlled by thrust washers located on either side of rear main bearing. 0.0075 in.
(0.19 mm oversize) thrust washers are available, that, 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 0.015 in. (0.38 mm) if used on both sides.
The limits for the crankshaft end float are given in paragraph 1-31.
(3) The main bearing caps are numbered and are not interchangeable. The main bearing shells are located
by means of tabs that insert in the slots in the bearing housings.
Before replacement of the main bearings is attempted, ensure that the correct
replacement is available. For identification purposes, the new bearings should
have an annular groove machined in the inner (bearing) face along the center line
of the feed holes. When the bearings are correctly located, these feed holes will
correspond exactly with those machined in the cylinder block.
(4) These shell bearings may be used on both early and later engines. The early type of shell bearing must
NOT on any account be fitted to later engines where the annular groove in the main bearing parent bore
has been deleted.
b. Main Bearing Replacement (see Appendix E Figure 52).
Main bearing and thrust washers can be replaced without removing the crankshaft.
(1) Remove engine from water distributor (see paragraph 4-40).