(7) Run the cutter down until it bottoms in the original counterbore. Clean the cuttings from the counterbore and
valve guide.
d. Installation.
(1) Cover the new exhaust valve seat insert with dry ice and let it chill for 10 minutes.
(2) Use a valve seat insert drifting tool to drive the insert into its seat.
(3) Allow the valve seat insert to warm up and expand. Then peen it over with a peening tool.
(4) Reseat the valve seats. The seat angle of the exhaust valve is 45 and that of the intake valve 30.
(5) Grind and install the valves (par. 136).
(6) Install the cylinder head (par. 135).
(7) Install the engine (par. 175).
178. Connecting Rod and Piston
a. General. The connecting rods for cylinders 1, 3, and 5 are different from the connecting rods for cylinders 2, 4, and
6. Be sure to mark the connecting rods properly to facilitate installation. Refer to appendix II, Replaceable Parts List, for
proper parts numbers when overhauling the connecting rods.
b. Removal.
(1) Remove the engine (par. 174).
(2) Remove the cylinder head (par. 135).
(3) Remove the oil pan (par. 126).
(4) Remove the piston (12, fig. 82) and connecting rod (16) assemblies one at a time.
(5) Turn the crankshaft (19) until the connecting rod cap (39) is in a suitable removal position.
(6) Remove the cotter pin (37) and unscrew the connecting rod bolt nut (38). The connecting rod cap removal
procedure is shown in figure 83.
(7) Lift up and remove the connecting rod cap (39, fig. 82) and connecting rod bearing shell (17).
(8) Wrap the lower end of the connecting rod (16) with a clean cloth to prevent scoring damage when the
connecting rod is removed from the cylinder.
(9) Scrape and remove carbon from the cylinder wall above the piston in order to facilitate removal of the
connecting rod and piston.
(10) Push the connecting rod (16) and piston (12) out of the cylinder. If the piston sticks in the cylinder, tap the
lower part of the connecting rod with a plastic hammer.
(11) Remove the connecting rod (16) and piston (12). Remove the cloth from the lower part of the connecting
rod (16).
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